Re: which posi unit to get?
I was faced with a similar choice 2 years ago with my 69 C-10. I chose to go with a new Eaton unit purchased through an Ebay store. I think it and the new ring and pinion plus a bearing/shim kit and shipping was about $450. I paid about $250-300 for the Eaton posi part. I now punish it regularly with my 454 and 3.73 gearing and it's never complained. I'm not only happy with it, but confident in it's long term durability.
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