Almost every rear end I've done has been with used gears and I re-used the bolts that were in my carrier when I swapped them over. The only time I actually put new bolts in was when I used a ring gear spacer and it came with new longer bolts. Then I ended up re-using them when I changed the gears out a few years later.
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
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