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Old 08-10-2019, 02:28 PM   #1
KRUNK !!!!
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Default posi unit

anybody ever used one of these kits with good results....thinking of installing in a 55 rear end......


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Old 08-10-2019, 02:46 PM   #2
Carmine

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No, I've never used one. I see it's an Auburn unit. I did look at that and also an Eaton posi unit. Big difference, maybe the only one, the Auburn is not rebuildable, whereas the Eaton one is. I don't know if it's a moot point or not. How many miles per year are you going to put on your car?? What are you going to subject it to, i.e., drag racing, hole shots, etc., I guess that would determine which way to go, Carmine.
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Old 08-16-2019, 06:53 PM   #3
f.i.57chevynut
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Default Posi

I prefer the old Dana posis if they are 1960 and later, the ones with left thread bolts and 5 plates per side with a belleville(cupped) plate to keep everything tight inside to prevent breakage. I set up a rear for a friend who bought a new Dana posi from up around Minnesota or thereabouts. It is a very nice piece but the people that made it didn't do their homework or their inspection process failed them, unlikely with CNC work. Anyway the ring and pinion was a 3.36 with 11 teeth. The barrel of the posi was not turned down enough to clear the ends of the pinion teeth. I ended up grinding the tips of the pinion teeth to clear the posi. (There is a part of the pinion tooth that doesn't contact the ring gear so I didn't weaken it) Just a tip, but I do prefer the rebuildable Dana posi over the cone clutch posi that you can not rebuild. Maybe I don't have enough years left to worry about that but I prefer to be an optomist. Good luck
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Old Today, 12:25 PM   #4
DZAUTO
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FIRST, forget the Auburn, enough has been said about them.

There are 2 good aftermarket replacement posi units, and I have no issues with either of them: Eaton and Nitro Power Lock.
The Eaton unit is a typical Eaton clutch type posi unit and the Nitro is ALMOST identical to the original Chevy posi units (made for GM by DANA).
I've installed both for friends and customers and I just do not see any performance differences.
BUUUUUUUUUUUUUUUUT, one thing-----------IF the Nitro unit is installed into a 55-57 axle housing---------USING STOCK 55-57 AXLES ------------- then just as needs to be done when installing an early posi rear into a 55-57 axle housing, 1/8in (NO MORE) needs to be trimmed off the end of the axle splines-------THIS IS IMPORTANT, it's not needed when installing an Eaton unit.

This is an article I put together a few years ago when converting a NON-posi case to accept a posi unit.
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File Type: pdf Converting a 55-64 non-pos to posi -Tom Parsons sm.pdf (1.69 MB, 1 views)
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Old Today, 01:11 PM   #5
Geoff
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Quote:
Originally Posted by DZAUTO View Post
FIRST, forget the Auburn, enough has been said about them.

There are 2 good aftermarket replacement posi units, and I have no issues with either of them: Eaton and Nitro Power Lock.
The Eaton unit is a typical Eaton clutch type posi unit and the Nitro is ALMOST identical to the original Chevy posi units (made for GM by DANA).
I've installed both for friends and customers and I just do not see any performance differences.
BUUUUUUUUUUUUUUUUT, one thing-----------IF the Nitro unit is installed into a 55-57 axle housing---------USING STOCK 55-57 AXLES ------------- then just as needs to be done when installing an early posi rear into a 55-57 axle housing, 1/8in (NO MORE) needs to be trimmed off the end of the axle splines-------THIS IS IMPORTANT, it's not needed when installing an Eaton unit.


Tom,

I sure appreciate your posts. I have a 64 3:36 posi unit that was put in my wagon 40 years ago and then never driven. I will make sure to trim the axles when I freshen it up.

This is an article I put together a few years ago when converting a NON-posi case to accept a posi unit.
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