Will I need to change my 8 3/4 out in order to run a trans brake? My car weighs 3100 pounds and runs 6.80's, would probably run 6.70's with the brake. I would love to be able to switch to a tranny brake so I could run super pro, but I'm not liking the idea of having to buy a $3,000.00 moser rear end to do it.