OK... so I have a problem

[florianz]

Originally Posted by BrianG

What kind of ring/pinion gears does this diff have? Are they helical cut (angled) or straight cut? Helical cut gears are quieter and tend to be more durable (more gear surface area making contact), but also tends to put a lot of thrust strain on the pinion bearings.

yep, Iv'e noticed that in my hyper 7. even that the diff is shimmed correctly, I had many problems with the rear diff recently.
- the axle of the outdrive has worn out the hole in the crown wheel of the diff (due to the helical cut?) and
- grease/silicone oil gets onto the bearing of the outdrive. Dirt gets sticky and kills the bearing.
- then, the diff crown gear gets too much play - result was a "raaaaatsch"
- before that, once the diff case got worn out, so the bearing at the outdrive had a little play, with the same results.

I think my torsen center diff causes that wear (power slips no longer to the front wheels).

took me some time to figure that out. I've ordered a new diff on egay uk for little money (hyper st and 7 have the same diffs).