Eustace16

Will 4.10 ten bolt gears go right into my 89 RS no problem?

J91

If it were only that simple, yes they will fit but you need someone experienced to set that rearend up. I have never seen gears bolt right in! There are some threads on here you should look up regarding this subject!

Eustace16

Alright sounds good thanks......so if i took the ring and pinion to a rear-end shop they wouldent be able to install in my stock set up?

G-reg

iTrader: (3)

probably going to need a new carrier too depending what gears you have in there now. If you're an RS with an automatic you've probably got 2.73's, so you'd need a new carrier. Don't forget a shim kit either.

t-top havoc

iTrader: (3)

Depends what " type " gears they are.

There are two kind I heard of, but don't recall how to tell them apart.

There is a " series 2 carrier " & a " series 3 carrier ".

Maybe another, but I can't remember.

See if you can find the number that was cast into the rear end somewhere.
The gurus will be able to help you.

87WS6

iTrader: (1)

I've got 4.10's in the stock carrier. Then again I've got a 1992 10-bolt which differs slightly from earlier years. 28 spline axles instead of 26-spline. I'm not sure what if any difference that makes in regard to the carrier.

big gear head

If you have 3.23 to 3.73 gears in it now then you have a 3 series differential, and the 4.10 will work on it. If you have 3.08 to 2.41 gears now then you have a 2 series differential and the 4.10 gears will not work, unless you have the special after market gears that have a thicker ring gear that is made to fit the 2 series.