In <33CE50FC.6F81@concentric.net>, aramm wrote:
>I'm trying to further diagnose the differential whine on my '67 GT,
>w/tube-type axle. It only whines if I'm on the gas. If the car is
>coasting or decelerating, the whine stops. Does anyone know what this
>might be a sign of? I also plan to change the gear oil tonight or
>tomorrow. Hopefully this will help.
>
The whine is occurring only when you are putting torque on the drive
shaft. This suggests that the problem is either in the nose bearings
of the axle or the pinion/crown gear assembly. I wish I had better
news, but either of these difficulties is pretty hard to fix. The
input shaft (which drives the pinion gear) is fit to the front
bearings with a very precision pre-load, and when things get loose
(though wear) this can accelerate wear of the gears. One thing you
could check is to see whether the input shaft (at the nose of the
diff) is loose. If there is any lost motion at all, it is faulty
(been there, done that). The tube-type
rear end is very much sturdier than the banjo-type, but it requires a
gizmo called a case-stretcher to get the pinion and bearings out. The
pinion/crown assembly are press fit into the case and will only come
out with a LOT of persuasion.
You may want to hunt around junkyards for another rear end. You only
need to get a physical match (i.e., tube-type, whether or not wire
wheel), they are all the same. Last one I got was about $150 and it
works fine.
A. B. Bonds
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