'63-'64 Differentials
As a service to fellow members I put together some photos of the 63-64 diff's because I often see questions on the early cars. A lot of guys don't know what was in there in 63-64 or what they may be looking at once they pop the cover off or go to buy one.
As many know the 63-64 optional posi wasn't the best out there and many are long gone by now. I still see some but you can't rebuild them nor would you want to unless you just want the original weak posi?
Here is a '63. It will bolt into any vette from 63-79 although in stock form is not recommended for most applications.
The covers didn't have a date code like the later covers do. The side plug is larger and has a machine thread. The later covers use a 3/4npt thread. The vent is steel
The top casting has through holes because it's thinner. This is a 63
Here is a 64
casting date on the LH side
The front bracket hole is tapped 7/16-14, 65-79 had thru holes
Inside the spreader holes are large on both sides. The later housings have 2 hole sizes.
Here is an original Dana posi in a stone stock 64 I did. You can see the difference if you compare to a 1st or 2nd design Eaton posi found in the 65-79's. BTW,the 65-68 Eatons weren't much better in stock form,most I see are cracked.
Here is a 1st design Eaton in a 63. This is also a 4 series case.
The Ring & pinion and pinion yoke are the obsolete coarse spline. They also used a small crush sleeve because of a soulder in the pinion.
Hope this helps answer those questions I often see.
As many know the 63-64 optional posi wasn't the best out there and many are long gone by now. I still see some but you can't rebuild them nor would you want to unless you just want the original weak posi?
Here is a '63. It will bolt into any vette from 63-79 although in stock form is not recommended for most applications.
The covers didn't have a date code like the later covers do. The side plug is larger and has a machine thread. The later covers use a 3/4npt thread. The vent is steel
The top casting has through holes because it's thinner. This is a 63
Here is a 64
casting date on the LH side
The front bracket hole is tapped 7/16-14, 65-79 had thru holes
Inside the spreader holes are large on both sides. The later housings have 2 hole sizes.
Here is an original Dana posi in a stone stock 64 I did. You can see the difference if you compare to a 1st or 2nd design Eaton posi found in the 65-79's. BTW,the 65-68 Eatons weren't much better in stock form,most I see are cracked.
Here is a 1st design Eaton in a 63. This is also a 4 series case.
The Ring & pinion and pinion yoke are the obsolete coarse spline. They also used a small crush sleeve because of a soulder in the pinion.
Hope this helps answer those questions I often see.
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