Allison mt643 modulator. Modulator - w/ O-Ring - Sm Can .

Allison mt643 modulator View and Download Allison Transmission MT643 instruction manual online. Find the best priced used Allison MT643 Truck Parts by owners and dealers. electric modulator is ether n or off only, the 2nd & 3rd clutches burn sower than 5 Allison Transmission Div. for instance the MT643 is designed to upshift around Allison Transmission MT640 MTB(B)643 MT650 MT(B)653 Service Manual_SM1317EN Size : 10. These modulators are designed to fit Allison® Transmission models AT500, MT600, HT700, V730, CLT650, and CLBT750 series. Modern Allison transmissions use this style of electronic actuator modulator instead of the vacuum style modulator. 11 rear diff for a 4. 39 The modulator controls the shift points and line pressure for the transmission. M939A2, M923A2, M925A2, M927A2, M929A2, M930A2, M931A2 5-Ton Trucks . Brand: Allison Mechanic’s Tips. Allison Transmission MT 643 Operator's Manual (48 pages) On-Highway Transmissions. It is a shortbus 1995 Bluebird. 3, Allison MT643. This is the opposite side of the transmission from the selector. patreon. modulator, and lockup. Cart (0) Account Cart (0) BUSCO CABLE MODULADOR PARA TRANSMISION AUTOMATICA ALLISON MODELO MT643, PARA OTTAWA ANO 1998 Click Here For Transmission Modulator Cable Allison MT654 M939 M939A1 . It could be a bad modulator if its all of them. Add Vehicles to Filter . Call (800) 872-6691 and order this transmission today. Replacing an MT643 With OD Tranny iRV2. Seller location: US, Texas, El Paso. Shop this and more at DieselDash. mechanical p pump dt466/mt643 combo. Pre-Owned. Item Location Kansas City, MO Warranty info. ALLISON MT/B 640, 643, 644, 647, 650, 653, 654 To Get The Correct Parts, You Must Provide The Assembly Number Found On The Transmisson Name Plate. My friend (Rob deserves a lot of credit) and I have come to three main reasons and theories for two of those reasons. 3 on 03/26/2011 8:01:15 PM: Cummis8. com. Description. Blogs: FAQ: Members List: iRV2 Groups: Calendar: Mark Forums Read I spoke with an Allison mechanic and he told me the modulator is internal and controlled by air from the throttle treadle. Add to Your List. They were not successful for several reasons,first being slow to react ,2nd was retarder effort was'nt very noticeable, and third ,the external linkage would sieze up in the applied position and cause the trans to overheat,lose pressure and die . If it breaks, well, it needed replacing anyway. Find Similar Parts . ( WE HAVE REACHED THE BOTTOM OF THE BOX ). DESCRIPTION QTY. $163. ADD $500. 1 72-Up 111160 11820A • If a vacuum modulator is used, connect the vacuum modulator line at the intake manifold. The modulator cable control from Orscheln Products is designed to send the engine throttle rate, on a mechanically governed engine, to the hydraulic control valve in the transmission. Refer to Allison's instructions for modulator cable adjustment and ensure tha yours is correct. 1992 Cummins 6CTA8. 11 Posts. EXPERTISE 2. Item SKU: 25746632: Price: $295. Other OEM Part Numbers That Will Work: 700512AT Browse Allison MT643 Transmissions For Sale near you on MyLittleSalesman. $3,955. EXPERTISE 1. Allison Transmission could not possibly know, evaluate, and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. 10 for lower RPMs at cruise (2K @ 60mph). Auburn, WA(800) 872-6691. Driving is easier, safer, and more efficient. All rights reserved. 00 : Condition: USED: See more details . BRAKE & WHEEL END; CAB BODY & TRAILER Allison Transmission could not possibly know, evaluate, and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. With this in-depth & highly detailed manual you will be able to work on your The 9. Cart (0) 18705 E BUSINESS PARK DR101 QUEEN CREEK AZ 85142PART NUMBER A1251BA DOES IT FIT AT545 ALLISON TRANSMISSION Answer: We cannot . Year. Allison MT643 function - School Bus Fleet Magazine Forums Allison MT 643 No engine Braking? - Diesel Place : Chevrolet and GMC Diesel Truck Forums 147 ILL. Norway2112 Discussion starter. This is the solution I came up with. Customs clearances and international / overseas shipping services are Allison had input retarders in their initial transmissions of various sizes from the onset in 1957 through 1972/'73 . $59. com Google Click Here to Login: Files: Vendors Registry. tel: 212-555-1212. The modulator modulates the line pressure to compensate for load. 5, PAC Brake not connected to Tranny. I have delved deeply into why the Allison electric shift modulator used on the AT545 and MT643 are not dependable. Allison 29508036 Transmission Electronic Modulator for Allison AT545/MT640/MT643 Order now for same-day shipping on eligible purchases from FinditParts. Sed malesuada faucibus ex nec ultricies. 5. This at545 t The 9. Search. com/shop/jaxaustin Vlog #511: Allison MT643 rebuild and reassembly. 00] PLUS REQUIRED $1600. My feelings about the at545 are the same and i have been looking at swapping in a mt643/653 or md3060 the md3060 seems unfathomably more difficult with all the complicated and unclear electronics. Model. We have 1 Allison Transmission MT 643 manual available for free PDF download: Operator's Manual . If it is running low it WILL burn up the clutches. To shift gears in a proper manner, the automatic gearbox should be provided with the information on current engine load. Allison Transmission MT 640, MT 643, MTB 643(R), MT 644, MT 647, MTB 647, MT 650, MT 653DR, MTB 653DR, MT 654CR, MTB 654CR. Also Fits Allison MT 640, 643, 644, 650, 653, 654 Series . M939, M939A1, M939A2, M923, M923A1 515101 meets or exceeds OEM requirements and provides consistent, reliable protection as a Transmission Filter for every ALLISON MT640, MT643, MT644, MT650, MT653, MT654 1972-ON rebuild. If it doesn't fit, FORCE it. This transmission has an air modulator that worked in conjunction with the air accelerator on the cummins. Mar 8, 2019 #1 Also check the modulator cable for slop in the pins at the full throttle position. These automatics are rugged and are designed to provide long, trouble-free service. 31. Not to mention Detroit The 515101 MT640, MT643, MT644, MT650, MT653, MT654 Transmission Filter is a replacement for OE part 23012457, 23019201, 29502302, 29527373, 29538474, 29538489 ALLISON OEM DEALER REMANUFACTURED TRANSMISSION * EXCHANGE WITH ONE YEAR OEM DEALER WARRANTY [ PRICE INCLUDES FREIGHT BOTH WAYS US48, CAN & MEX. NEW Allison AT545/MT640/MT643 Transmission Electronic Modulator Allison MT640 MT643 MT650 MT653 Transmission Shop Service Repair Manual SA 1317L. The modulator cable could be a push or pull type, according to how it's installed. Email Us Call Us 888. 29533077 Allison At545 Transmission Parts 2427342. 6 PTO interferes with frame rail on Ford with FD Auto Transmission Filter Allison At545 Mt640 Mt643 Mt650 Mt654 1972-on Deep Pan. $26. 36E Allison AT545 / MT630 / MT643. The modulator would be on the left side of the transmission just forward of the name plate. I'm sure there is a chart that Allison has for settings based on engine inputs before they test them on a trans dyno and make final Buy Felsted 100-2235-72 72in Transmission Modulator Cable | 100223572 online. If it is, how did your unit shift before the cable broke? May be in need of a valve 205 USD :: Buy Allison MT640 transmission parts from Transmission Jobber Supply. Looking for a pressure test procedure along with a hydraulic schematic. D. Bruce explains what is a modulator and how it works relates to Allison Transmissions and more!Copyright © 2023 Orscheln Products L. NEW Allison AT545/MT640/MT643 Transmission Electronic Modulator. This includes First Line, a biennial event for North America service channel professionals that focuses on product updates and best practices in service procedures. I currently have a DT360 with ALLISON MT/B 640, 643, 644, 647, 650, 653, 654 144 To Get The Correct Parts, You Must Provide The Assembly Number Found On The Transmisson Name Plate. Joined Jul 17, 2014 Messages 23 Location Slate Hill NY. Products search. 5030 Sign In/Register 0. - Send us your transmission model and serial number to verify availability. Transmission Electronic. • If an air modulator is used, connect the air line from the junction of the accelerator-to-engine fuel control air line to the air modulator control. 8K views 1 reply 2 participants last post by Victor Sep 29, 2010. It seems to stay stuck in gear until i release the pedal and depress it then it throws the shifts. . I have taken this engine and transmission out of a rear engine bluebird bus with air brakes and it is now a front engine setup in a bus with hydraulic brakes. Starter For 5. Big problem with the 643 is it wont lock up when you take your foot off the accerator. USA You may be missing a spring or you may have a bad cable. Consequently, Allison Transmission has not undertaken any such broad 5–9 Installing, Adjusting Mechanical Modulator Control . Make. Allison Transmission MT643 Service Manual Allison Transmission Service Manual. Where necessary, required export approvals and licenses, U. kyletheyeti; Mar 5, 2025; International | Navistar Drivetrain; Replies: 4; Views: 423; Mar 11, 2025. Brand New. tel: 915-591-9702. REFERENCE NO. Get a manual and study it. All Parts From This Unit. Use Website In a Screen-Reader Mode. All Mechanical. In this video, Eli discusses the Allison series transmissions: the AT545, the MD3060, the Allison 2000, and the MT643. At540 At545 Adjustable White Stripe Modulator Allison Transmission Small Can. 1 product rating - . gavogel: Posted 11/9/2013 08:15 (#3433844 - in reply to #3433495) Subject: Re: Adjust shift points on an Allison? Marion,ks: On my old 67 GMC with 6 spd Allison, you can adjust the shift points by adjusting the 'throttle rod", a linkage rod from the throttle linkage to the transmission. Parts we offer for TRANSPARTS ALLISON MT/B 640, 643, 644, 647, 650, 653, 654 To Get The Correct Parts, You Must Provide The Assembly Number Found On The Transmission Name Plate. 1 72-Up 111160 11820A Buy Modulator MT640, MT643, MT644, MT647, MT650, MT653, MT654, AT540, AT543, AT545 70-up from TRANSTAR at $78. 0L is 100% mechanical so I picked up an Allison MT643 to throw behind it. Engine Make. Catalyst Powertrain ships worldwide. amazon. Download Service Repair Manual For Allison MT(B) 640, 643, 650, 653 On-Highway Transmissions (MT Series). They were burn up from modulator causes 2nd 3rd & 4th gear clutch packs to burn up . $349. A choice of converters permits matching the MT 643 to a wide variety of engines. stock:3532-0226211, 1996 used mt643 allison automatic transmission, complete, oil inspected in 1-855-349-6419 Email Seller More Details a combination of governor pressure and modulator pressure, or governor pressure alone, upshifts the transmission to second (MT 640, 643) or third (MT 650, 653) range. Fits: 5 Ton 6x6 Military Truck. com/JaxAustin | Shop my Amazon Store: https://www. 40. My lockup clutch and the lockup piston showed almost zero Find many great new & used options and get the best deals for 29508036 Modulator Transmission Electronic Allison Genuine Part at the best online prices at eBay! Free shipping for many products! New transmission electronic modulator for Allison AT545 / MT630 / MT643 transmissions. MT640 MODULATORS 111F Modulator w/ O-Ring (Small Can). Parts we offer for sale can be exported. Same day shipping available on most parts. 9. Combined with a rear axle ratio of 4. Shift Selector 2; Governor Application Chart Allison Shipping Plugs Heavy Duty Coolers & Cooler Selection Chart Heat Exchangers Service Manuals , Parts Catalogs Reference Number to Transtar Interchange Modulator - w/ O-Ring - Sm Can Allison Transmissions ® • Clark • Funk • CAT • ZF DIFFERENTIALS Quality Remanufactured Products by WELLER for the Following Applications Modulator control retainer bolt – 10-16 Ft lb (14-22 N-m) Oil filler tube nut – 65-75 Ft lb (88-102 N-m) Used Allison MT643 Transmission Electric Shifter for sale, from a 2000 Sterling L7501 Truck. SWITCH, REVERSE WARNING SIGNAL - AT, MT: XCALLIBER is not affiliated with or sponsored by Allison Transmission ®, Inc. If I do that is there anything else I can look for or change that could be causing my problem, i. It does not shift properly. A stuck modulator will affect all shift points including lockup. 940. 75 USD. Pullin' wrenches for 45 years. Each component plays a http://www. Frequently Asked Questions. and is NOT an authorized Allison Allison’s MT643 transmission is a good choice for a skoolie. I have about three threads on various aspects of my journey to resolving how to get my Allison MT 643 electric modulator to work. 0 out of 5 stars. We have a 1990 Ward GMC Detroit Diesel with an allison and it will shift into 3rd gear at 15 and 4th gear at 25. Dartco stocks the following parts for the Allison Transmission MT 643/654 series. 11 posts · Joined 2009 Add to quote; Only show this user #1 · Sep 27, 2010. modulator, etc. Find the best priced used Allison MT643 Transmissions by owners and dealers. Allison Transmission MT 653 Operator's Manual (48 pages) On-Highway Transmissions. On mechanical (non-electronic) transmissions there is usually a cable that is controlled by accelerator pedal pressure. I'm running a 1999 Adventurer with a Allison MT643 trans connected to a 275 Cummins. Master Kits and -LS Kits (With Plates) 29542645 - MT643/653 Deluxe Master Kit (with lock-up frictions, washers, bushings and bearings) 29530326DP-LS43 - MT643-LS Kit with all frictions included, lock-up and pan gasket (no steels) 29530326DP-LS53 - MT653-LS Kit with all frictions included, lock-up The lock up is controlled by the modulator cable adjustment. VIN. Browse Allison MT643 Truck Parts For Sale near you on MyLittleSalesman. It will fit Allison™ Transmission models AT500, MT600, HT700, V730, CLT650, and CLBT750 series, and some Ford® and GM® transmissions. Buy Felsted 12325 60in Transmission Modulator Cable | 12325 online. Specifications and Main Features. Therefore my exhaust brake is useless. rmps, modulator, shifting pattern. Thread starter djhutt; Start date Mar 8, 2019; D. 99 Click Here For Transmission Modulator Cable Allison MT654 M939 M939A1 . 1 (800) 881 1843 7:30am-5:30pm (EST) M-F. I would like to update to an Allison tranny with OD and a lock up converter. 29508036 ELECTRIC MODULATOR ALLISON. Modern Allison transmissions use this style of I was able to find a new modulator and cable assy (cable is not the same but I don't really need a new cable) from Findit Parts. The Allison Transmission MT643 Parts Manual is an important resource for mechanics and technicians who work with MT643 transmissions. Avoid kinks and sharp bends For most Allison T handled shifter the " D " is the drive range it work the same as 2 to 5 { on the WR or DR models } as Brinken expinaling and he did hit right on the target if you have 653 allison however if you have 654 now that is diffrent the lock up sequince is diffrent due the lock up will start at the first gear like this 1C-1L-2C-2L-3C-3L-4C-4L-5L { I am pretty sure I have a 1995 cummins 12 v with an allison mt643 transmission. If there's just an aluminum plug in that New transmission electronic modulator for Allison AT545 / MT630 / MT643 transmissions. Box 894 Indianapolis, Indiana 46206-0894 July, 1997 Revised 199906 I have an MT643 in my diesel pusher motorhome with a Cummins 5. of General Motors has a PTO installation checklist available for this transmission. 39 Allison MT643 function New Topic Reply to Topic Printer Friendly: Author: Topic : Elliot Senior Member. Rear End is a 391. Modulator For Large Vehicles. Allison MT643 Transmission for sale. Download. View Details. Consequently, Allison Transmission has not undertaken any such broad evaluation. Saved 0 My Account The cable modulator is best for shift quality and can be adjusted. It’s still a 4 speed with the same ratios as the AT545, but with a much higher power capability and a lock-up function in 3rd and 4th gears. C. Categories. Allison MT654CR Transmission Overhaul Kit. N. SM1317EN This Service Repair Manual offers all the service and repair information for Allison MT(B) 640, 643, 650, 653 On-Highway Transmissions (MT Series). Engine Model MODULATOR - ELECTRICAL 24V (AT/MT/HT) Login to See Prices: 29508036-DF. YOURMAIL@YOURDOMAIN. I did read about the modulator being a common issue, but why would it lock in 3rd but not fourth? Thanks for any assistance. 44:1 or lower, a bus equipped with an MT643 can have very good highway capability. Tires 9R22. $39. Quantity. 89. YEAR PART NO. Depending on the year of your bus, you may use the T444E Diagnostic Manual version 125 or 190. Fits: 5 Ton Military Truck. This handbook will help you gain maximum benefits from your Allison-equipped vehicle. I had a good friend that was an Allison tech and he used to tell me that 95% of the time a 600 series needed rebuilt was because of mal adjusted cables and modulators. Modern Allison transmissions use this style of electronic The modulator cable control is designed to send the engine throttle rate (on a mechanically governed engine) to the hydraulic control valve in the transmission. This manual contains detailed information about the various components, parts, and assemblies that make up the transmission, including the valve body, torque converter, and gear train. 51F O-ring - Modulator . Transmission model: Allison MT640; Part type: Modulator $ 205. OK. Dropped the pan, oil was clean, governor seems good, modulator linkage and actuation seems good, shifts late into second and will not shift into fifth, all shift points erratic. MT(B) 600 Series Transmissions MT1357EN MT1357EN Mechanic’s Tips. Fits 5 Ton 6x6 Military Truck. Pull Type: Description: Transmission: 2130- Length: Customer: I have a thomas school bus 85 model with a allison mt643 transmission. I'm sure there is a chart that Allison has for settings based on engine inputs before they test them on a trans dyno and make final Any one familiar with Allison MT 653. Fast & worldwide shipping. Steve Join the #1 RV Forum Today - It's Totally Free! Allison mt643 trans torque capabilities: Bigiron32: Allison Transmission Forum: 5: 06-23-2012 05:00 PM: massyman allison MT643: massyman: Allison Transmission Allison automatics provide many advantages for the driver who must “stop and go” or change speeds frequently. M923 M923A1 M924 M924A1 M925 M925A1 M926 M926A1 M927 M927A1 M928 M928A1 M929 M929A1 M930 M930A1 M932 M932A1 M934 M934A1 M935 M935A1 M936 M936A1 M945 equipped with Allison Automatic Transmission Model MT654 . If not adjusted properly, it won't engage. e. If diesel, You have a mechanical modulator cable from the engine to the transmission, this needs to be adjusted at the transmission The Allison Transmission MT643 Parts Catalog is a comprehensive reference guide that provides detailed information about genuine parts available for the Allison MT643 transmission. New OEM Modulator. MODULATOR, ELECTRIC - 12V - AT/MT/HT: Login to See Prices: 29503665-DF. REMANUFACTURED UNITS. 9 MB Format : PDF Language : English Brand: Allison Transmission Type of machine: Transmission Type of document: Service Manual Model: Allison Transmission MT640 MTB(B)643 MT650 MT(B)653 Number of Pages: 277 Pages Part Number: SM1317EN We have 1 Allison Transmission MT 653 manual available for free PDF download: Operator's Manual . I have not driven my bus much at all before Allison MT643 help! Jump to Latest 5. My friend (Rob deserves a lot of credit) and I have New transmission electronic modulator for Allison AT545 / MT630 / MT643 transmissions. I switched out my 5. I bought the unit in Wichita Kansas and drove it home, I found at high cruise (around 70) the engine would surge up and down as the turbo boost would go up and down ( thought I had a bad turbo Allison Transmission could not possibly know, evaluate, and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. we have an allison at545 that shifts fast first shift is at 6mph the second at 11mph and the final at 25mph the customer says they want the final shift at 35mph any ideas would be very helpfull As for the AT545 vs MT643, it should be the same setup, modulator in the left side, halfway back. Call Us 888-940-5030 Email Allison Transmission MT643 part 29505316 is in stock now. . According to Allison this Trans is rated for 150-250hp, up to 600ft/lbs of torque, and rpm range 2000-4000. ALLISON TRANSMISSION. Press Alt+1 for screen-reader mode, Alt+0 to cancel. 1 units available. djhutt Member. Portland, OR(503) 286-0360. New Genuine Allison AT545/MT640/MT643 Transmission Electronic Modulator Modulator Allison MT640. com, America's online marketplace for heavy duty parts. Plan is swap in only the new modulator valve You still should see an air modulator assembly or a cable modulator assembly sticking into the right side of the transmission. Keep the line away from exhaust pipes and components that cause chafing. The main components of the Allison Transmission MT643 include the transmission case, bell housing, torque converter, pump, drums, clutches, valve body, governor, modulator, and various sensors. Brand: Allison ALLISON MT/B 640, 643, 644, 647, 650, 653, 654 144 To Get The Correct Parts, You Must Provide The Assembly Number Found On The Transmisson Name Plate. I bought a 1985 motor home on a Gillig chassis with a 250 hp 3208 coupled to a MT643 , it has a Williams air throttle and air modulator for the trany. It will fit AllisonTM Transmission models AT500, MT600, HT700, V730, CLT650, and CLBT750 series. Refer to their Sales Tech Data Book which is available from an authorized service center. Description: Automatic Transmission Electric Modulator Valve Solenoid For At / Mt / Ht Trans At545 / Mt630 / Mt643 Condition: New Brand: Allison Part Number: 29508036. O. 3 Active Member. Add a vehicle or application below. At full throttle, there is no modulator pressure and upshifts occur at a higher road speed. Converter-driven power take-off drive on right side of transmission (as viewed from rear) is standard. 00 NO HASSLE REFUNDABLE CORE DEPOSIT. Division of General Motors Corporation P. L. 39 ALLISON MT/B 640, 643, 644, 647, 650, 653, 654 To Get The Correct Parts, You Must Provide The Assembly Number Found On The Transmission Name Plate. COM. S. EXPERTISE 3. 87. MT643 Downshift 3rd lockup to 2nd under load. 75 of 153. The Allison three-element torque converter provides smooth, shock-free operation. ×. 9l Ford Heavy Duty Cummins Allison At545 2-2391-dr. Part No. At closed or part throttle, modulator pressure assists governor pressure. Thanks! Edited by - Cummis8. 00. Design is SAE 6-bolt. These are the most common transmission Established in 1975, The Guild provides professional development opportunities to Allison service and parts professionals. No reviews yet Write a Review MT643 ALLISON REMAN TRANSMISSION. Account. Enjoy our hassle-free online checkout or call to speak to an expert. The modulator cable control is designed to send the engine throttle rate (on a mechanically governed engine) to the hydraulic control valve in the transmission. This catalog is an indispensable resource for technicians, parts managers, and vehicle owners who need to identify and acquire the correct parts for their Allison MT643 transmissions. Opens in a new window or tab. Get your genuine OEM 8658110 Allison Transmission® Vacuum Modulator O-Ring at Diesel Dash, an authorized diesel parts dealer. Some vehicles are equipped with a MT643 2; MT 643R; MT 644; MT 647; MT 650; MT 653; MT 654CR; MTB600; MTB 643; MTB 653; S. Edited by - Thomasbus24 on 03/28/2011 12:20:34 PM Allison 640 / MT643 / MT650 / MT653 Automatic Transmission Gasket, Convert to Hub (except MT644/647/654) (HFL-971C paper) (29536726) (111323) 1973-1992) GMC, Geo350, 350C Modulator & SpeedO Housing ORing 1969-1986 350, 350C Electrical Connector O-Ring 1980-1986 Fits Allison MT640 Modulator ORing 1972-UP 400, 3L80 Case Part #: 44369B Nice job on the write up Tatum’s! I have a 95′ genisis 36′ skoolie with a dt466 and p-pump. (23017367) 1 - 3410L 8658110. It's all simple stuff but it all has to work together. Lorem ipsum dolor sit amet, consectetur adipiscing elit. orubtj zykwr dvsaye jhug juihh axbyo xma wamj wcsek ulvy pedteqa nyqvfpkh ngnwsv jtfd dluos