i was thinking of changing my pinion angle to about 7 degrees for better launch out of the hole but a friend said it would not make a difference on a independent rear suspention car because the diff is mounted solid to the body of the car and you would not get the same affect that you would on a solid axle car because the diff doesnt move with the suspention. any insight? anyone?

 

Your friend is correct!
You won't benefit from a different pinion angle on a IRS set up. Actually on an IRS vechicle if the pinion angle is not right the universal joints on the drive shaft can be placed in an improper angle causing them to operate out of phase with each other which can lead to vibrations and eventually breakage. That is also the same for a solid type rear suspension but the pinion angle would also effect how much force (traction) the rear axle would place on the tires when under launching conditions.

crispeed
87TII
9.20@150mph 1/4
5.91@118mph 1/8
1.32 60ft
651RWHP/520RWTQ
T-72
2600lbs

 

How odd, I posted what Crispeed said, yesterday.