I have an '07 Chevy Tahoe. After coming to a complete stop at a light or stop sign my Tahoe shifts "hard" from 1st to 2nd gear after taking off again. It does it every single time without fail. When I say hard I don't mean it "slams" into gear, it is just very noticeable and didn't do it before.

I have taken it to the dealership and two other highly recommended local transmission shops. I received three different diagnoses:

Chevy dealership thinks it may be in the driveshaft.

Transmission shop # 1 thinks it may be in the valve body in the transmission.

Transmission shop # 2 thinks it may be the ABS module.

Has anyone else had any experience with this? Personally I think that Transmission shop # 1 may be correct, but that is also the most expensive solution

 

Well, you are supposed to have a firm shift, not slamming into gear, but firm. If its a slush box and you cant feel it shift then you are wearing out your clutch packs...

If you were to unplug your mass air flow then it will shift real firm, but not slamming it...