I've had several rear diffs apart. The pin that the differential gears run
on has no bearings. It is a steel pin going through the steel gears. During
straight driving this is not a problem as these only turn when you are turning.
When the tire size is mismatched these gears turn all the time. They simply
were not designed for this kind of service. Will it toast them in a couple
miles? Most likely not. 50 to 100 miles? Don't know. I think the answer is
that
the diff wasn't designed for this type of service and it is best to avoid it
if possible.
The front on the other hand has totally independent bearings and can run
forever with different size tires.
Check on the availability of diff bits and make your own choice.
keith
In a message dated 8/15/2008 10:07:19 P.M. Pacific Daylight Time,
fj20spl311@yahoo.com writes:
If you drive any distance with mismatched rear tire diameters, you
risk permanent damage to the differential. So to be safe, a mini has
to still be the same diameter as the other tires you're using.
-- John
John F Sandhoff sandhoff@csus.edu Sacramento, CA
Sorry John,
But that is an OLD WIFE's TALE if you have an OPEN rear axle.
50-100 miles would be not problem, and that's all you should be driving on a
mini spare.
You are subscribed as keith0alan@aol.com
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