Author Topic: 4.30 or 4.56 gear set for 3series posi carrier???  (Read 1809 times)


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4.30 or 4.56 gear set for 3series posi carrier???
« on: August 13, 2009, 07:07:07 PM »
well, I just figured out the source of the vibration coming from the rear of my car..
turns out that the differential yoke is not spinning "true"  which means 1 of 3 things..

either the yoke is worn out of round
the pinion gear is bent
the bearings in the rear are running sloppy on one side..

i won't know for sure untill i pull the axle apart, but while it's apart, and if I do need to replace the 4.10s that are in there... i might go with 4.30 or 4.56 for a little added fun on the street.

the only question is can they be purchased in a "thick" gear for use with a 3.series posi..

i don't have the $$ to even deal with this now, but it needs to be fixed.... and I can't justify swithing posi carriers just for the sake of getting a steeper gear..

I dont' drive long distances on the Highway with the car, so i'm not worried about that.

Any ideas??



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Re: 4.30 or 4.56 gear set for 3series posi carrier???
« Reply #1 on: August 14, 2009, 06:57:48 AM »
Apparently adaptors are available, but you can get both 4.56 and 4.88 gearsets that will fit directly onto a 3-series carrier.
No 4.3s unfortuantely.

Depending on your "need", I'd go a 4.56 out of the two choices. (I'll probably go 4.88 when I change from my 4.11 9" to a 12 Bolt.)
Restoring my RHD 69 Jane in Melbourne, Australia.