I'm in the same process. I almost bought a 3.23 posi that ends today on ebay but everyone thinks I should go with the 3.55. Between the posi unit the gears and the kit it's about $700 at Murrays Speed. Brands are Auburn and Richmond Gears. I am going to pay $250 for the labor, I might screw it up.
Hope this helps,
JG
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