What have you done to improve traction?

[Bar50]

If your Hellwig bar has links versus the OE style that bolts to the control arm, test drive with one link removed.

Same with the front, you can remove the link from one side to see how it does. It helps at the drag strip. I haven't seen the videos, but, one trick to preload the suspension is to place an airlift or drag bag into the passenger side rear spring, it only needs about 12-15 psi in it. Just add pressure 1 psi at a time until it leaves straight. They are around $100 a pair new....only need one.

But the bolts and mounts holding the poly bushings should float, not bind.

Hop Stop bars were popular for G-body cars as well as A-body predecessors. The 9 inch rear gets the geometry for free due to size. Dick Miller Racing offers a nice set.

I have went as quick as 1.48 60 foot on slicks and stock uppers (with stock old bushings)with solid lowers (like SSM or Iceman offers) and pinion angle set at 4° down. You take out 1° for each point that is solid (heim style).

 

[Bar50]

 

[motorheadmike]

Stop hitting it with your purse, ya nancy! 😉

 

[UNGN]

Under power, the rear axle transfer's weight from the passenger side to the driver side, making the right side lighter and the tire easier to spin. Once the right side starts spinning, the left side will begin to spin, as all the power gets transferred to the other tire.

If you go to the track and put one rear tire on the track scale at a time and power brake, you can see hundreds of pounds shifted from one side of the car to the other. Stand straight and lift your leg and all of your body weight shifts to the straight leg. Pinion torque lifts the passenger side leg on the car.

This is why drag racers preload the right side of a G-body with a swaybar or Airbag in the spring. If the right leg is longer under no load (and therefore carries more weight) and pinion torque shortens it, the two legs become more even under load and less likely to break loose individually.

Taller tires also help. 255/60's have a longer contact patch AND the increased tire diameter reduces the force being applied to that patch through reduced torque multiplication. With street tires, taller tires are almost always quicker than shorter tires, through shorter tires are quicker "in theory" due to their increased torque multiplication. This theory assumes perfect traction and that will never happen on the street.