Hey y'all I've got a 97 Sierra I dropped an LS in mated up to the factory 5 speed in the truck and got it running and driving and all but I have a vibration. Not sure where it's coming from I found I had a broken tranny mount which I just replaced but it still vibrates. Does it a little bit at idle but becomes more noticeable in 3rd gear while accelerating and gets worse once in 4th and 5th. Goes away when coasting though. Anyone know what could be going on? Thanks.