I changed both filters and put valvoline transmission fluid in my 01 2500hd duramax with the allison 1000 and instantly service engine light on and wont stay in gear!....deleted codes several times.. i can drive it for maybe 20 feet then it will pop out of gear and sometimes pop back into gear!....
Make sure you have the proper amount of tranny fluild in it and get that Valvoline fluid out of it. Allison transmissons have there own type of tranny fluid and you want to use it. You can buy the right stuff from a Allison dealer. Most Detroit Diesel dealers are also Allison dealers. Look them up in your phone book and they will tell you the quanity and sell you five gallon pails of the fluid. Just get the serial number off of the side of the transmisson before you call. Change the fliters again too. Believe me, this is important. My company has Yard horses with Allison transmissions and you don't want to screw with the small stuff. Service them right and they work as hard as you want.
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