Over the summer I installed a Tremec TKO in my 70 Eliminator. It is originally a BOSS 302 car, but now sports a 351c-4v. I ordered the kit from darhorse performance. I had to replace the clutch disc becuase the TKO has a 26 spline input shaft compared to the original 10 spline. I got everything installed and switched my rear end from a 3.89 open to a 3.50 Posi. I put it back on the road and found that as I get close to 2000 rpm the whole car shakes. It shakes the same amount @ the same rpm no matter which gear it's in. I never had a problem with my 4 spd. It stops shaking when take my foot right off or put it in nuetral. If anyone has any input it would greatly be appreciated.