Duramax Allison issue

[ss3011]

Originally Posted by SDT1DYI

Decided to change the screw on external transmission filter during other maintenance work on my 2018 3500 Duramax.
Purchased a well know house brand replacement filter . Immediately experienced down shifting problems. Purchased a GM filter from the dealer @ a 34.00 cost.
Problems ended. Going to purchase a couple of more for inventory.

Be aware if you have late model Duramax tow rig.

Steve Teeter. STK 6380/6283

This is interesting ! Did you change the Fluid when you put the aftermarket filter in ? What happened when you say you had down shifting problems ? Did the problems go away immediately when you installed the GM filter ?