[Roadsters] Datsun-roadsters Digest, Vol 2, Issue 357

[Keith0alan at aol.com]

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 at 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 at 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.
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