Quote:
Originally Posted by Piotrsko
I would think that damage is proportional to lube breakdown. What I know about spiders in either ford or mopar diffs is that the shaft or gear becomes spalled or brinnelled.
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The greater the mismatch in tire sizes the faster that satellite (or spider) gears have to rotate. While rotating they spin on the cross pin shaft. Again, the larger the mismatch in tire size the faster the gears spin on the cross shaft. I've never seen a satellite gear with a proper bearing, they are just polished metal on metal because they aren't meant to spin at high speed or for long periods of time. Yes, you can easily break down the oil film between the parts. You can also wear the surface of the gear teeth.
We could kill a differential in 20% of normal life with a 10% difference in tire diameter.