So I just got an ls that I'm putting in and bought a new clutch for it. Bought a tranny off a local and dropped it last night. I started up the car and put it in reverse and the car doesn't move at all. Also in every other gear goes no where. Jacked it up to see if tires would spin in gears and they did in 2nd and 3rd. Thought flywheel step might be different but checked that too. Is it transmission or did I do something wrong?

 

did the speedo move?????

Check axles.