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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29586
Experience:  GM Grand Master Technician 2007. 14 years experience.
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gmc: duramax..allison..shift input shaft, there is a module..seal

Customer Question

I have a 2003 duramax gmc 2500 with the allison 5 speed automatic. The transmission is leaking oil around the shift input shaft, there is a module with wires plugged into it around this shaft. Is the seal around the shaft the only thing that can leak and is this easy to change?
Submitted: 8 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 8 years ago.
WelcomeCustomer We usually don't see these seals leak, but they are not hard to change. You simply need to remove the Park neutral position switch and remove the old seal. There is a special tool to remove the seal and a special drivers to install it. Then you only need to put the switch back in. The position of this switch is vital to the proper operation of the transmission. If it is out the slightest, alot of shift issues will arise.