fabcraft

Available SEVERE DUTY 3.55 ring and pinion gear sets for
1965 thru 1976 full size Oldsmobile cars with 10 bolt cover, 12 bolt ring gear.

This original gear option is perfect for the automatic and stick shift guys alike. Complete Master Rear End Rebuild kits and some Posi Units also available.

Call 1-800-208-8242 for Early Bird Special Prices and Multi-Gear Set discounts. Don’t wait!

Made in USA!
Offshore not welcome at FabcraftMetal Works.

Olds64

Interesting. I wonder what Monzaz would have to say about this. He is our resident expert on differentials.

citcapp

Moved to Parts for Sale Forum

Kennybill

Hmmmm, I don't think so. This is probably for 1965-70 A-body Olds rearends. Full size Olds used the Pontiac rear-end to 1967. 1967 to 1970 used an Olds-full size style, I forget the ring dia. Then in 1971 to 1976 that used either "corporate" 10 or 12 bolt. My 71 Royale has a 10 bolt 8.5 because it "was" a 455/2 barrel. I have a 1971 Olds 98 that is a 455/4barrel and it has the corporate 12 bolt 8:75. I might be wrong but thats what I have noticed. I have 1965/1966 Pontiac rearends in my 67 98's. Ken

Olds64

Ken, I was thinking the same thing. Full sized Oldsmobiles changed in 1971. I thought it odd that one rearend would fit 1965-1976.

Kennybill

your 98 should be a "corporate" 12 bolt, easy to get posi unit and gears for. I have been thinking of converting my 71 Royale to a 12 bolt posi with better gears. Later, Ken

Oldsmaniac

This same ad appeared in Hemmings. I too am aware of rear usage in the B bodies so I checked in the Pontiac section and the same ad ran there for full size Poncho's....best bet would be to call them to be sure of application.

wmachine

Guys, you're missing the whole story here. Fabcraft has gone to a lot of time and trouble to make these new gears. I spoke with the guy there, and I suggest you do the same. He is a wealth of knowledge about rears (including Olds) as is Jim at JD Race (monzaz).
It is kinda complicated, but the gear is actually made to fit the "shallow" gear carriers as they are much more common than the "steeper" 3.23/3.42 carriers. If you talk to him, he can tell you exactly what it will fit, how, and why. Trust me, he knows what he is doing!
The gears are not actually made yet, but plans are finalized and it is in the initial stages of production and he is trying to round up interest.

Olds64

Kurt, that is cool. It is always good to see people interested in manufacturing aftermarket parts for our Oldsmobiles.

monzaz

Yes, Brad at Fabcraft has made gears for the Buick group and I was extremely involved in getting them the gears sets and parts needed to get it all done. Brad made 3.42 gears for the 10 bolt 8.2 BUICK rear from 68-70 and went over well enough to get 3.64 set made.

Fabcraft has produced gears for the 1957-64 Pontiac Olds drop out Gasser rears and Pontiac 10 bolt 8.2 4.33 gears etc.

The 65-70 Pontiac Olds 10 bolt cover rear with 12 bolt ring gear retention.

Brad at Fabcraft has done extensive research to make the gears fit the 65-76 FULL size PONTIAC / Olds rears. NOT for the Olds 12 bolt cover 12 bolt ring gear retention rear.

REMEMBER: THESE GEARS ARE ALL AMERICAN GEARS FROM DESIGN TO CASTING, FORGING CUTTING AND SALE. SUPPORT YOUR OWN AND GET YOUR AMERICAN CAR TOOLING DOWN THE ROAD QUICKER.

Take care guys, Jim - J D

CrazedCountryRebel

Shoot... when will someone make gears for these...

65 Delta Guy

1965 Delta 88...can anyone give me any idea what to look for. Looking to hook up as well as get good freeway action! Any idea's ya'll......

Oldsmaniac

What gear do you have now?? If you have AC it prob is a 308 and without Ac prob a 323. Either one is decent all purpose gear. To jump up to a 355 you would have better standing start acceleration but gas mileage would go down noticeably on the freeway..... it is all according to what you are looking for. For the most part the steepest gear option from Olds for the B body was 342.

wmachine

Interesting that even though 3.42 was was the steepest offered by Olds (even over the counter), gears were made for that 12 bolt (10 bolt cover) 8.875 up to 4.33. It is actually a Pontiac rear, and Pontiac offered all the steeper gears.
Not that the OP would want to consider those!

aliensatemybuick

Here's some useful info about the Pontiac rears as used in 65-67 Olds:

http://www.teufert.net/fullsize/rearends.htm

Shows the number of teef on the carrier and ring gears, which you can always count to determine your ratio if the code on the axle housing cannot be read due to years of rust and grime.

Oldsmaniac

I guess Olds was not promoting their B bodies to be able to run with the A bodies like Pontiac. In the Old Car magazines Pontiac did advertise that performance options were available for the larger cars. Possibly too Olds did not want to let on that their 65/66 B body rear were Pontiac units thus the performance ring and pinion availability was hush hush.

Rickman48

But don't forget, too, that pontiac started playing in NHRA with the Super Duty back in '61, and even had 2X4's, aluminium noses and 'swiss cheese' frames back then to be competitive with the big cars.
Remember "Wide-Track"?
And then the GTO changed history!
And our Fathers had Oldsmobiles!

aliensatemybuick

I remembered a guy on 442.com with a '65 Delta, built as a tribute to one he had back in the day with high (numberic) gears; info. is still there 10 years later:

http://442.com/vcs/1964_1972/odonnell.html

Turns out he had 4:33s, guess he knew what he wanted back then and made it happen (dealer installed or whatever).

65 Delta Guy

Good input gang...when I get my car back from the body guy I will hunt numbers to see what I am running factory. Something about a posi hole shot that really says muscle car! I would say... that is my motivator as well as a fast 0-60.