what is the best thing to do ..... besides a 12bolt or ford 9'' swap
to make this rear end good for drag racing ...11 sec car ?

 

Weld the Axel tubes to the Pumkin.
There are braces out there that connect to each tube. I don't know how good they are & if their weld on or bolt on. Supose to reduse Axel Tube Flex.

Get a Good Posi (Eaton for Ex.). I'm not saying there the best.

But, even doing all this, the Ring & Pinion are still the weakest Links. If you are going to use the 10 bolt for Dragging, get some Richmond Gears. From what I read & heard, there made to with stand some punishment. Maybe they will hold up for awhile.

I would upgrade the Yokes & U-Joints also.

 

I had richmond gears in my old 10 bolt, still did not help too much. (lasted a little longer)

best thing is an eng. that is more rev. happy that way you don't bit the track too hard on your launch but, even at 11's I don't know

 

i seen a place online who sell a detroit locker for the 7.5 i am thinking of getting that ? also i was thinking about a mini spool ?