Hey all, new to the scene here. Hoping I will be able to find the answers I'm looking for on some problems I'm having with my fox, learn some stuff that I might be unaware of, and make some new friends in the process. I'm the proud owner of an original cobra and I'm trying to do a transmission replacement. Tranny is a tremec3550 and I know there are alot of ppl out there who dislike this particular tranny and alot that love it. Well, I'm taking my chances because I've had this trans for a while and it's just been sitting in my garage(new, never used). I had it put on a 351W project of mine which I gave up on and sold. I kept the drivetrain components though. the trans fit fine on the 351. I bought all the necessary equipment to go with the tremec, even a new billet flywheel. I put all the same parts on the cobra, even the flywheel(prob shouldn't have done that). the clutch is a centerforce dual friction(new also). I've got this nasty vibration when I start it up and worse when I hit the gas. I'm thinking I shouldn't have put that flywheel on there. It was just a bit heavier than the stock flywheel but didn't occur to me about the crankshafts being a different weight on the 351 to handle that flyweel. I'm going to start the process of tearing it all back down again,