Funny my 4 speed 340 Duster never made a full pass with the 8.75. It was either swap to a Dana or an automatic, I chose the automatic. I have the aluminum center section in mine with a pro gear and have been good to this point but before with a street gear I would plan on a ring and pinion every 2 seasons or so.

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I'm on my 5th year on my street gears... still perfect

To the OP... those load bolt just slightly load the
back of the caps (inside) so they are less likely to break