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Old 06-14-2013, 08:38 AM
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Eaton LSD for 8.2" 17 spline 3rd member

Anyone have any experience with the aftermarket Eaton clutch type LSD?

it's for the 1955-64 8.2" ring gear diameter, 17 spline axles, and its for 3.90 and down ring/pinions. This type has the drop out center section(3rd member) like the Ford 9". So I can have a set of high gears for cruising and another 3rd member setup with low gears for for performance driving.drag racing.

Eaton part number 19686-010, it costs a little over $600.

1955-64 GM 3rd member 8.2 17 3.90 & dn 19686-010

I know the stock 8.2" 10 bolts wil break if you look at them wrong. SInce the Eaton LSD replaces the entire stock carrier do yoiu think it will stand up to some performance use, occasional slick use?

Anything else that can beef up these 8.2 17 spline 10 bolt rears?

Can any of the other 10 bolt carriers with 25 spline axles such as the 8.5" be swapped in, provided you swap axles as well? Any other tricks?

This will be in a 1957 Chev 2 door hardtop(Sports Coupe). I have a LOT of these rearends around and would like tos ee if it can be put to use.

thanks in advance


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Old 06-14-2013, 09:45 AM
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I have a lot of experience with the Eaton Posi, but not the one for the '55-'64. It's the same inside, just different dimentions. These are very good differentials. I'm thinking that you can do an upgrade to 30 spline axles in these. Eaton might make this unit for the 30 spline axles. As far as I know you might have to trim one of the ribs inside the stock case for the differential to fit. The P case already has this rib removed. The '57 and later cases are stronger.
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