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Discussion Starter #1
Don't know where to post for sure. Whats it worth? Everything is there and appears to be original, 336 gears dated April of 64. It had been cleaned and sitting for a while. Thanks,
 

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If this is a "P" case then $1,500 to $2,000 to a some doctor or banker restoring an early C! Corvette. If it is a standard case with an aftermarket posi it would depend upon the condition because the aftermarket posi's can not be rebuilt with new clutches you have to buy another posi to replace it.

The problem with this rear end is that the rear end was designed in 1943 to be placed behind a 216 cube six cylinder. It will not handle a lot of torque, because it was never designed to handle it.

Big Dave
 

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I ran a '63 Factory Posi Unit in my '56 Nomad for about the 8 last years I had it. Had a 327 pushing about 325 HP. Had about 100 Hi-Rev Burnouts and about 500 true Power Shifts (pedal to the floor and stayed there) on it with the 4-Speed Muncie and Hurst Comp Plus Shifter, spinning wide H-60 Tires to boot.

The Rear never wimpered. Was just as good as the day I installed it.

But that was my car.

A friend of mine also ran a Factory Posi in his '57 Bel-Air with a built 402 Big Block, 4-Speed Rock Crusher. I'm sure it had at least 450 HP. He didn't do quite as much racing as I did, but same story, Rear never wimpered. One day he blew the Rear Universal to smithereens, but never the Rear.
 

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Discussion Starter #4
If this is a "P" case then $1,500 to $2,000 to a some doctor or banker restoring an early C! Corvette. If it is a standard case with an aftermarket posi it would depend upon the condition because the aftermarket posi's can not be rebuilt with new clutches you have to buy another posi to replace it.

The problem with this rear end is that the rear end was designed in 1943 to be placed behind a 216 cube six cylinder. It will not handle a lot of torque, because it was never designed to handle it.

Big Dave
Thanks Dave

It has a P with a date code of D284, so I think it is what they call the thicker case, all original I think, except maybe the bearings. Is there a way to identify original bearing.

So what you are saying is no one would want this thing except someone with a early corvette.
 

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Thanks Dave

It has a P with a date code of D284, so I think it is what they call the thicker case, all original I think, except maybe the bearings. Is there a way to identify original bearing.

So what you are saying is no one would want this thing except someone with a early corvette.
No what I am saying is the early Corvettes where a full size Chevy frame and suspension with the back seat area of the frame removed. They think they have a hot rod and are willing to spend through the nose to get those old original parts that were rarely installed in Corvettes because they (rich guys with deep pockets) think that all Corvettes had them. It also halves the torque load on a single drive axle with more powerful motor

In truth most Posi cases (which were clearanced inside for the larger posi differential) was most frequently encountered in cars sold in northern states so that they could be driven on ice and snow covered roads. There were a few who bought them to race but back in the late fifties and early sixties even the salesman had no idea what a posi was. This makes a P case rare and with the demand for them high; so the price goes up with the demand. I doubt that many would want to buy a P case for their Impala when the price is approaching that of the price of a new 12 bolt or a much stronger Dana 60.

I became quite good at speed shifting my Borg Warner T-10 crash box, but I also broke a rear end a week (sometimes two). I used recapped slicks which probably didn't help. I was driving a '53 Chevy 150 with a 409 under the hood at the time, because a '55 was still too expensive to buy back in 1961. When the price dropped I owned a bunch of them; all powered by a 427 L-88 motor because I liked a solid cam and 12.5:1 compression. Though after the Muncie came out I ditched the Borg Warner for the stronger GM variant. I learned a lot replacing parts that I broke, and became pretty good at rebuilding rear ends, transmissions, and blown motors.

Big Dave
 

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I think you are selling short. A P case is rare. I sold one for $1,800 to go into a '61 Corvette.

I did see you removed the main caps. Hopefully you marked them before you removed them other wise the case has to be remachined to maintain bearing size (same as you resize a connecting rod only more involved because of the case needing a fixture to hold it).

Big Dave
 

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Discussion Starter #8
This is a 64 case, so if my research is correct that would be a pass car an no corvette. Is that correct? And a a result worth much less?
 

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This is a 64 case, so if my research is correct that would be a pass car an no corvette. Is that correct? And a a result worth much less?
The same pumpkin fits all of 1955-'64 full size B-body, 1953-'63 Corvette and the 1962-'64 Chevy II. The housing and axles differed to fit the track of the vehicle and the housings differed by width and bracketry to mount the rear and shocks.

Here is a bare P case for case at $600:

https://www.ebay.com/itm/1958-37438...484058?hash=item41b864bd5a:g:hfEAAOSwEzxYNfHc

Another bare case for $700:

https://www.ebay.com/itm/1959-37438...736686&hash=item3ab67c8c9c:g:RzsAAOSwFGNWRg6~

and another one for $700:

https://www.ebay.com/itm/1959-37438...125178?hash=item41d1496ffa:g:GfEAAOSwJoNZ1~hE

A real bargain here a complete posi pumpkin for only a $1,000:

https://www.ebay.com/itm/1959-1960-...d=282684125178&_trksid=p2047675.c100005.m1851

Half of four series Posi for $160, missing the other half and guts (side gears, idlers and posi clutch pack as well as half shafts):

https://www.ebay.com/itm/1955-64-CH...383322?hash=item3ae4b83f9a:g:QRoAAOSw5cRZHdz-

Do you get the idea that it is worth more than $500?

Big Dave
 

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A thick “P” and a ‘64 case isn’t for the Corvette guys.
I saw two complete thin “P” hog heads at the Louisville swap meet for $450 and $475. Both non Corvette years.
I’d say $250 since it will need gears, clutches and bearings. JMHO
 

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Discussion Starter #14
In doing some more research, it is a thin P, meaning it was manufactured at the Detroit/Flint plant. and the Date code also indicated a Detroit/Flint plant.

The thick P would have been made at the buffalo Plant and the date code would have had two letter for the year 64, this case only has the 4 for the year, indicating the Detroit/Fliint plant.
 
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