I know you want to keep it all mopar but your best bet is to put a 9" under it and then you can get gears all the way to 7.33. I used 7.00 in my SS on a 3/8 mile dirt. about 6500 at the turn in.89-92 in tire. what really works well is a full floater rear from a modified.If u have any swapmeets or auctions in your area now is the time and u can probably pick one up for what the mopar pig would cost.