Re: Tunnel slap!

[Chris.Prael@domain.elided (Chris Prael)]

That sounds like the engine mounts and the transmission mount are gone and
way past due to be replaced.  One or both of the engine mounts is probably
broken and I would expect that the rubber in the transmission mount is also
broken.  

The only thing keeping the engine and transmission in the car is gravity!

chrisp

> Date: Wed, 24 Feb 1999 15:36:36 -0800
> From: Mike Grace <mgrace@domain.elided>
> Subject: Tunnel slap!
> 
> I've got a scary-sounding problem with my '74 GTV. When I hit nasty
> expansion joints in the freeway at 70 mpg (indicated), I frequently get a
> severe WHACK! from the driveline slapping into the side of the tunnel. It
> seems to be the donut joint which hits, but the U-joints, donut,
> trans-mount, and motor mounts are all new, the driveline was recently
> dynamically balanced *on the car*, and there's zero (or minimal) vibration
> felt at speed. The center support is not new, but it appeared good to me
> and my mechanic. What's up? This dynamic interference is difficult to
> pinpoint, but definitely unacceptable.
> 
> Thanks for any help-
> Mike Grace
> Santa Barbara

------------------------------