will a 95 z34 monte carlo tranny bolt up into a 96 z34 monte carlo?

1995s and 1996s aren't interchangeable. They'll probably bolt up, but according to the interchange, 1995s and 1994s are interchangeable.

Yes it will if it is the right gear ratio.There is a metal tag near the final drive cover,It will have such as ws,af,bs in big letters.The last letter is in the little letters and number.If it is not the right gear ratio,change the final drive and sometimes the wiring inside the transmission by looking at the big round plug