I have 64,000 miles on my 2000 z28. I just had to have the transmission rebuilt. From the time I bought the car til the day it just started grinding inside, it shifted real hard from 1st to 2nd gear. ALmost like a shift kit but just that shift change. Now since it's been rebuilt it shifts like a normal car, not a Camaro. Is this normal or does it have something to do with the way it was rebuilt?

 

its honestly hard to tell. to my knowledge, gm did not change the 4l60e/4l60 transmission at all from their light duty trucks to the f-bodies. please let me know if i'm wrong, though. anyway, all main shift operations are controlled by the pcm, even the line pressure, so its possible that the line pressure on a camaro is a little higher than an s-10 or something so that it applies with more force to prevent slippage from the extra power the ls1 has. the 4l60 platform is a darn good platform and will hold plenty of power, or at least enough to easily handle what a stock gm truck, f-body, etc will hold. I'd say you had a problem before. maybe not anything big, or even with the transmission. remembering that the pcm controls almost all shift functions, the pcm makes those transmission decisions based off of other sensor inputs, like the VSS, TPS, ECT, and often a turbine input speed sensor seen on many new gm vehicles (your car does not have this, though). for example, if your TPS is bad or has a short, the pcm will boost main line pressure from 40-60psi, all the way to as much as 450psi (depending on vehicle) because it senses a fault in its input data. this is it's own little way of protecting itself against damage, although 450psi of mainline pressure will start to blow seals and cause other problems after a while. this is just one example, and in your case a snesor input to the pcm could have been skewed enough to boost line pressure enough to where it shifs harder than it should. i highly doubt you were pushing anything over 70psi though. you'd definatelly feel those shifts in your neck if it was anything from 100-450 psi. I know thats a lot of info there, but take it all in. its very helpful in diagnosis