Any thoughts on why my sure-grip did this?

imopar360 said
Car info: 72 duster-318,mopar purple cam 340 repo grind,headman headers,2.5 exhaust with x-pipe,street demon 625cfm carb,and edelbrock performer intake.904 trans stock

3rd member Info: 489 case 3.23 gears..

A friend sold me a a-body 8 3/4 for my 72 duster and gave me this 3rd member for free.But my question is it safe to drive it like this or should i replace the sure-grip unit? And also if there's cheaper alternatives to the sure-grip units?

Or will it just be cheaper just to buy another 3rd member because I really want 3.55 or higher gears? Thanks

I have never seen a pin eat its way through a case that much without grenading. IMO I would keep the housing just a but a new SG with what ever gears you want. Your going to have to set up the new internals anyways so adding a set of gears on top of it is no big deal, just the cost of the gears. Also, If your gonna be spending the dough on a new locking unit, take a look at the Detroit True Trac.