hi i needs some help. i have a 86 olds cutlass w/ a rocket 350 eng. and a turbo 400 3spd tranny running w/ 3:73 rear end posi. its really fast at the line but at about 60mph the car vibrates like crazy. and the rpm is howling at about 5000rpm. was wonder if i should swap trans to a th200r or 700r w/ adapter plate. or is there something else i shoul do. is it normal to have such a high rpm at 60mph.
any help would be greatly appreciated.