If you have your rear tires inflated differently, the rolling diameter is
different, and the spider gears will rotate. These spider gears are always
partially immersed and/or passing through the 80-90 gear lube. even when
they are not turning there is tremendous side pressure on them.
Even when they are turning we are not talking hundreds or thousands of RPM,
and they are tempered steel. They will hold up.
Bob Winslade
1966-1600 Missy
1967-1600 Bender
----- Original Message -----
From: <Keith0alan@aol.com>
To: <fj20spl311@yahoo.com>; <datsun-roadsters@autox.team.net>
Sent: Saturday, August 16, 2008 9:10 AM
Subject: Re: [Roadsters] Datsun-roadsters Digest, Vol 2, Issue 357
> 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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