Missed a shift at the track, now I run dogbone mounts

At Summit Point last month, I yanked the shifter into third during a hard pull and the whole drivetrain twisted so bad the clutch pedal went dead. Turns out my stock motor mounts were shot, letting the engine rock a good 3 inches. I threw in polyurethane dogbone mounts over the weekend and the shifts are crisp now, but the whole cabin vibrates like a massage chair at 80 mph. Worth it for the consistency, but has anyone else dealt with NVH getting worse after stiffer mounts?

1 comments

Log in to join the discussion

Log In

1 Comment

charles3185d ago

Been there with poly mounts on a street car and the vibes get old fast. A few things helped me: check that the mounts are torqued with the car sitting on its wheels at ride height, not jacked up, since preloading them makes the shake way worse. Also look at the trans mount and torque arm bushing, because if those are still soft the engine is fighting them and you feel more of it in the cabin. Some guys run a stiffer mount on the engine side only and keep a rubber one on the trans to cut the buzz. Give it a few hundred miles too, poly does soften up a little once it settles in.

7