Quote:
Originally Posted by mnunn454
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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I just found my invoice. I paid $350 for the Eaton Unit, and $110 for a new Motive Ring and Pinion via Ebay. It was invoiced by Drivetrain Specialists. As I recall, for 12 bolt truck rear ends, 3.73 and higher gearing takes series 4 carrier. 3.42 takes a 3 series. You can run a 4 series ring and pinion on a 3 series carrier if you use a ring gear spacer, but not the other way around.