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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Need to ID this rear differential and gear ratio
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Topic Review (Newest First)
08-05-2012 03:33 PM
big gear head Randy's Ring & Pinion has them at 2 of their warehouses. They had the best price that I found. They also might have some kind of limited slip differential. I didn't look into that. Contact Bruce at extention 5517 or Jim at index.jpg. Jim might give you a better deal on them.
08-05-2012 01:07 PM
3.38 gears

Can you tell me where to go for them?
08-05-2012 12:43 PM
big gear head I did some checking and I was able to find a 3.38 gear for this rear end. I don't know of any limited slip differential for it, but you can change the gears to something that is a little better on the highway.
07-21-2012 04:35 AM
SSedan64 There just isn't many parts for that 9.375" 55T Rear. No aftermarket Posi Carrier.
A complete Rear swap, GM 8.875" 12-Bolt, GM 8.5" 10-Bolt or 9" Ford would be the best option.
07-15-2012 07:51 AM
beachbum0 Hy, SSedan64 Thanks man, went to that link,will give them a call. would be nice if thay had limited slip to drop in, look's like the same and it was my year. Even if I had to fork out the dollars for a hole pig, it might fit onto the tube's. thanks againe
07-15-2012 06:24 AM
poncho62 Take the cover off and count the teeth.......use gasket maker |(come in a tube) for a gasket
07-14-2012 11:09 PM
rear end

Well I will just keep looking because it's under the truck so well. I would hate to start cutting and welding. Thanks for the help, maby someone will see this and have a solution.
07-14-2012 11:03 PM
rear end

I forgot to add, the axle is in place and I would rather not have to make another fit . By checking, it's a open rear and would like a limited slip.
07-14-2012 10:59 PM
big gear head I don't k know of any parts that are available for that rear end. I just don't have any experience with it.
07-14-2012 10:55 PM
the make of this rear

Insted of a swap, can I make this differential into a limited slip? And if so, can I change the gear ratio ?
07-14-2012 10:54 PM
SSedan64 X2^^.
Only aftermarket ratio I've seen available is 3.38
GM 55T rearend.
Differentials: GM 55T - Drops out the front of the housing in attition to having a 12 bolt rear cover. Uses c clip axles. Ring Gear Bolts: (12) 3 8 x 24 RH
07-14-2012 04:53 PM
big gear head That's the old truck rear end that was used from somewhere in the mid '50s. Sorry, I can't tell you much more than that. I haven't been into one of those before. My brother has the same rear end in his '57 truck. I think it was replaced by the truck 12 bolt around '64.

If you only turned one wheel then you only got half of the gear ratio. If you leave one wheel on the ground and turn the other wheel exactly 2 full turns and count the number of times your driveshaft turns that will be your gear ratio. If it turns just past 4 times then it's a 4.11, if it turns just past 4 1/2 times it's a 4.56... Those old trucks usually had gear ratios in the 4s.

A popular swap for those rear ends is the '67 to '69 Camaro or '68 to '79 Nova rear end. I'm pretty sure that those truck rear ends are right at 60 inches wide, which is what the Camaro and Nova rear ends are. This will also get you the smaller 5 bolt pattern for the wheels.
07-14-2012 04:32 PM
The make of this rear end

Finally i was able to upload pictuers can someone tell me what this rear end is so i can get the cover off and get a gasket.
07-14-2012 04:17 PM
rear end

I just marked the tire and the drive shaft the driveshaft turned two times around for almost exactly one time around for the tire, can this tell me anything about the gear ratio.
07-14-2012 04:04 PM
beachbum0 do you see the pics in my profile? What is the rear end make ?
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