My offset bushings move the hole, what? Half an inch?
They've been in my car some 40-odd years now! Originally when it was a
street car, now as a race car. Never had any vibration issue with them.
(Speed traps at Road America caught me at 100-plus at the Runoffs last
September, no vibration).
In fact, some 20 years ago we re-mounted the diff even higher by making new
mounting holes in the frame to push it up as high as space allowed, maybe
another inch. Still no issues.
That's what U-joints are for. :-) The change in the angle is minimal, and
the change at the front of the diff is zero because the front mountings are
in the same place.
At least, that's my experience with them.
--Rocky
----- Original Message -----
From: "Scott Janzen" <sjanzen@me.com>
To: "Christopher Bock" <SeaCubeCo@aol.com>
Cc: "FoTTriumph" <fot@autox.team.net>
Sent: Wednesday, December 28, 2011 10:50 PM
Subject: Re: [Fot] Gt6/spit diff question
> you might want to check driveshaft angles before you offset bushings to
> change the height and angle of the diff.
> If this increases the differential between the driveshaft/u-joint angles
> front to rear, it will result in more vibration at high speeds, which I've
> found to be an issue with at my car at speeds above 100-110. Ideally the
> diff and trans are at the same angle to the driveshaft, and/or their axes
> are parallel. They're not the same in my car, but I've tried to
> manipulate mountings to get them as close as possible with a resulting
> decrease in vibration.
>
> On Dec 28, 2011, at 6:02 PM, Christopher Bock wrote:
>
> Are the rubber bushings at the back end of the diff where it mounts to the
> frame upright replaced for racing? If so by what? Rubber? Aluminum?
>
> Thanks
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