bump when shifting into second gear

[doylee4693]

Hello, my 03 tahoes tranny has been doing something strange that I cant figure out and of course theres like 3 tsb's that could be it but before i throw away all my money on it I figured I would see if anyone had similar issues. When shifting into second gear it makes a bump feeling but no sound. you can feel the lurch which is definatly annoying. any ideas? one tsb says its 1-2 shift accumulator and another says pcm reprogram.

 

[OR VietVet]

Well you said 3 tsb's. What does the third one say? I would think the reprogram would be the least expensive attempt but am curious what the third tsb is.

 

[doylee4693]

cant find exact tsb but it was i believe replacing the valve body. no matter what reprogram is cheapest however Im bringin the truck in monday for a tranny fluid and filter change.. is shift accumulator easy or cheap to replace, should i hold off on the fluid change in case they need to break into tranny. was even thinking maybe a vette servo would help but im not sure.

 

[OR VietVet]

Tell the shop that is doing the service about your concerns and ask for estimates for what it will cost to attempt to address the tsb's while in the trans without dropping it and going inside. Just what can be done during the service and a reprogram if they can do that. They should "always" road test before any work they do and they can offer an opinion based off what they feel during road test and the tsb's you found. Smart techs will work with you to help. If they are not willing to road test and give opinion about estimates and tsb's, then walk away. Good shops will easily do as I suggested and maybe even have a better recommendation that works for you. They are supposed to be specialists, take advantage of that.