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differential gears
Posted: Mon Oct 30, 2006 8:09 pm
by Peetee
I am curious what componants different differentails share. Obviously the crown wheels differ on a 3.9 and 4.22 diff but are the pinion gears common to both?
Posted: Tue Oct 31, 2006 5:01 pm
by wanderinstar
Would think not. Because you fit a crownwheel and pinion as a set. If I remember correctly the numbers on the Diff eg 28/7, 31/6. the smaller no is no of teeth on pinion. Therefore if you try put a 6 tooth pinion where a 7 tooth one should be they wont mesh properly. ( the numbers are not correct, just for an example)
Ian.
Posted: Tue Oct 31, 2006 5:09 pm
by JimK
The different numbers of teeth on both pinions and crownwheels mean the teeth are at slightly different angles and it all gets very complicated.
Hypoid gears have some clever machining and geometry going on.
Posted: Tue Oct 31, 2006 7:54 pm
by Peetee
Sorry, maybe I'm getting my terms mixed up. I don't mean the gear on the end of the propshaft. It's the identical gears within the diff in line with the driveshafts.
Posted: Tue Oct 31, 2006 8:05 pm
by bmcecosse
Ahhh - the diff cage gears - likely these will be same for all - but that's just a guess.
Posted: Tue Oct 31, 2006 8:09 pm
by JimK
I think those are called planet gears, and I doubt there's any reason for them to be different between diffs.
Posted: Tue Oct 31, 2006 8:44 pm
by minor_hickup
I did see a crown wheel and pinion set sold as an upgrade to 3.7:1 gearing for the minor axle, so I would assume they are compatible.
Posted: Wed Nov 01, 2006 5:00 pm
by Kevin
Ahhh - the diff cage gears - likely these will be same for all - but that's just a guess.
That will be correct otherwise when you changed a diff you would also have to change the halfshafts.