[Formulajones]

If it makes you feel better, I have stock GM 12 bolts in almost everything here, some are 4 speeds and see abuse and make decent HP. With an auto it's even less of a concern.

I've been racing my SS Chevelle with it's stock 12 bolt since 1987. All I did to it back then is install a Moroso brute strength posi unit and a pair of stock c-clip style 30 spline axles from Moser which are beefier (non tapered) than the original pieces. I did that because I didn't want to cut on the housing for C-clip eliminators. I do have a 1350 yoke in that one because I upgraded the driveshaft. It's also 4100 lbs. race weight. I haven't touched that rearend since 1987.

Been beating on that car ever since with 600hp/tq and now installing a 598 that makes 786hp/772tq. I doubt I'll revisit the rearend other than maybe taking some gear out of it for the new engine, I don't think I'll need a 4.10 anymore. With that said I'll have to change the 4 series posi unit so I'll probably swap it for a tru-trac at that point. Otherwise I have no reason to disturb it.