4l60E issues
 

When I first start the car and start driving there is one hard shift and I won't feel any shifting for the rest of my drive. Reverse works fine and I can manually down shift to second gear. If I switch from overdrive to drive it makes no difference so I think I'm stuck in third gear. I also think I'm stuck in third gear because at 65mph I'm hitting about 3000rpm. Any idea on what's wrong with it?

v6 and v8 camaro
 

the camaro with the transmission issue is a 95 z28 camaro and i was wondering if it has to be rebuilt can i just swap the transmission with a transmission from a 95 v6 camaro? I'm wondering this because I have a spare camaro in my backyard.