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Bad66 07-25-2012 11:25 AM

rear end choice for a 66 skylark
My 66 skylark has a bone stock 1 wheeler peeler rearend. I would like a 3.73 or higher posi, but I think I need a bigger housing to hold the carrier. I'd like to do this cheap, so when surfing thru Craigslist, what kind of rearend should I be looking for. I'm looking for an easy swap. Thanks

SSedan64 07-25-2012 12:13 PM

An 8.5" 10-Bolt from an 70-72 A-Body or 73*-77* A/G-Body will work = *Wider width, 1" or so.
8.5" 10-Bolt from 84-87 G-Body, Buick GN, Olds 442/HO = 58" WMS to WMS.
12-Bolt from an A-Body 65-72 Chevelle. 65-67 = 60" WMS to WMS, 68-72 = 61" WMS to WMS.

8.5" rear axle - The 1967 Oldsmobile Cutlass and 442 Resource - GM 10-bolt Differential Technical Information

9" Ford housing are also sold to bolt in, Quick Performance, Strange, Moser, Currie etc..

WMS = WheelMountingSurface.

big gear head 07-25-2012 01:09 PM

The '64 to '72 A body rear ends are the only ones that wil bolt in. The '73 and later rear ends will require modifications to make them work. You can put a posi and 3.73 gears in the rear end that you have. The parts are available, but you need to find someone who knows how to set up a ring & pinion set to do the installation. Your car has the 8.2 BOP 10 bolt rear end with a 27 spline pinion and 28 spline bolt in axles. This rear end is stronger than the Chevy 8.2 10 bolt, so don't swap it for the Chevy rear end. A 12 bolt would be stronger, but a good 3.73 posi 12 bolt for a '65 or '66 A body will run you about $1000 to $1700. The '71 and '72 A body 8.5 10 bolt is a good rear end, but a little hard to find. They were used in the Cutlass and Skylark in '71 and '72 only. These may be 1 inch wider than the rear end that is in your car now. They also have bolt in 28 spline axles, but they have a 30 spline pinion.

If you have been doing one wheel burnouts and you put a posi rear end in your car you need to replace the rear tires. If one tire is worn more than the other this will cause the clutches in the posi to slip and get hot while you are driving. It could ruin the posi or possibly ruin the whole rear end because it will cook the oil. The air pressure in the rear tires also must be kept equal.

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