Allison transmission - Printable Version

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Allison transmission - Paul - 07-20-2024

I’ve got a 4030 Allison tranny, runs great, parked at home after 200 mile trip, couple hours later saw a small red puddle of Transmission fluid. That was a week ago, try tightening pan bolts. Yesterday was going to move it, while letting air build up, there was a much larger puddle of oil. This is on a2001. Owned probably 25 of these transmissions, first time I’ve had a problem. Any ideas would be greatly appreciated.
Thanks in advance

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RE: Allison transmission - Richard - 07-20-2024

Clean it up with carb cleaner, then place dry white paper towels all around. It will show you the leak. Don’t forget the transmission cooling hoses.

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Johnnyboy - Johnnyboy - 07-20-2024

Probably front pump seal. Use Lucas hydraulic booster and leak seal. It works

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