The transmission mount for a 91 camaro rs is near the tail end of the transmission. It is connected on the top portion of the cross member. If you do not know what the cross member looks like, look underneathe the car and find the tail end of the transmission, where the drive shaft is inserted, and you will see a bar going underneathe the transmission connecting to the frame on either side of the transmission. The transmission mount sits right on top of the cross member. You will have to take the cross member off to get to the mount.