I bought a 1997 Chevy Suburban K2500 about a month ago, and I’m working on getting some smaller issues fixed right now because it’s been lacking power. One of the bigger issues is that it shifts hard when going into 2nd gear if I’m giving it gas. Other than being gentle on the pedal, is there anything I can do to fix this? And if not, when the time comes to replace the transmission, should I stick with stock or upgrade to something else? Looking for some advice on the best route to take here. Thanks!
If it’s an electronic transmission, I’d start by checking the throttle position sensor. A faulty one can definitely cause issues with how the transmission shifts.
Dax said:
Is it shifting hard or just firm? A firm 1-2 shift could be a sign that it has an aftermarket shift kit installed, which is meant to make shifts feel more aggressive.
It’s definitely hard, not just firm. It jerks bad enough to throw you forward if you’re not expecting it, especially when giving it gas.
A transmission fluid and filter change might help smooth things out. If it’s been a while or if the previous owner didn’t keep up with it, that can cause rough shifts. Also, consider checking the transmission mount – a worn-out mount can make shifts feel harsher.
If you do end up needing a new transmission, I’d recommend going with a 4L80E. It’s a pretty solid upgrade over stock and can handle a lot more abuse, especially if you plan to tow or push the engine harder in the future.
@Ari
Thanks for the suggestion! I’ll keep that in mind if I have to replace it. Not planning on doing any crazy towing but I like the idea of something stronger than stock.
You might want to check your transmission control module (TCM) too. Sometimes a bad TCM can cause the transmission to shift rougher than it should. Might be worth having a mechanic check the electronics before jumping to a full transmission replacement.