mt 643
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Solution: Allison Electric Modulator Activation
I have about three threads on various aspects of my journey to resolving how to get my Allison MT 643 electric modulator to work. This is the solution I came up with. After much troubleshooting I determined that the ECM was not sending the signal to the modulator relay. Why, I don't know. I...- Simplicity-SKO
- Thread
- at 545 electric modulator mt 643 skoolie transmission
- Replies: 7
- Forum: Mechanical and Drivetrains
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MT643 Downshift 3rd lockup to 2nd under load
I switched out my 5.11 rear diff for a 4.10 for lower RPMs at cruise (2K @ 60mph). I have not driven my bus much at all before doing this, so I'm not sure if it acted this way before the swap. Anyway, everything seems to work great except in one situation, that's when going up hill. It goes...- Simplicity-SKO
- Thread
- down shift downshift mt 643 mt643 skoolie
- Replies: 72
- Forum: International | Navistar Drivetrain
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Allison shifter cable R&R
Has anybody replaced their shift cable on a rear engine Allison mt series? This is in a 91 BB AA RE 40 FT. Thanks- s2mikon
- Thread
- mt 643 skoolie
- Replies: 0
- Forum: Mechanical and Drivetrains
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