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Old 10-11-2004, 02:48 PM
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Advice on rearend rebuild

Hey folks,

I am diving into a project that I have never tackled before and I thought I would ask this knowledge base for some basic advice before I get started.

'66 Caprice, 8.2" 10-bolt rear end, about to be upgraded to 3.73 gears fitted onto a new Eaton positraction unit.

The kit comes with everything I should need, including a "how to" instruction video, via Ebay.

Can anyone offer any basic recommendations as to what to look out for/what to do when installing new gears and posit unit?

I have the old stuff out and I'm waiting for the new to arrive so I have been wondering what I'm in for?

Any anecdotes or experiences to share about rear end rebuilding?

I'll be watching, thanks.

JimR

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Old 10-11-2004, 07:54 PM
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The most difficult part is determining what thickness pinion shim is required in order to obtain the proper gear teeth contact pattern. There are tools that can assist in this, but for us hobbist, it's pretty much a trial and error system. Try a shim, check the pattern...over and over until you hit the right combination.

Vince
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Old 10-12-2004, 06:32 AM
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I tired myself out looking for any and all information on doing the gear install in my car, and it paid off.

I measured everything upon removal from the donor axle, and from the axle in the car and simple math indicated what I needed to put the gears and carrier in the car axle compared to the truck axle they came out of.

I bought everything I would have needed to do a complete swap, and lucked out with being able to re-use many of the used parts.

The places I dealt with gave no problems with the returns of many of the un-needed parts and even helped out when I had a part in a kit that was damaged in the production process, they told me to put the individual part number on it and send it back for refund of that part.
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Old 10-12-2004, 07:18 AM
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Thanks for your replys.

I am wondering, does the pinion depth change much when you put the final torque on the yolk?

JimR
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Old 10-12-2004, 09:37 AM
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Pinion depth does not change as you torque the retaining nut. As you tighten the yoke retaining nut you compress the crush sleeve that preloads the bearing. The clearances do not change.

The installation kit that Currie Enterprises sells (I believe it's Currie) has a new rear pinion bearing that the ID has been honed to allow a slip fit over the pinion neck instead of a press fit. This allows easy refit of different sized shims until the proper one is determined. If you do not have the honed bearing you must have acces to a hydraulic press to get the bearing off and on again.

Vince
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Old 10-12-2004, 09:43 AM
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Thanks again for the info. I should be getting a UPS delivery sometime before the weekend. I can't wait to feel how it launches with both tires digging in.

JimR
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