Acceleration rate is dependent on the mass of the vehicle vs the torque of the engine and gear ratio....
If you want better acceleration, drop the mass (weight) of the vehicle), increase the torque application by softening the rear tire application (reducing slip) and increase the final drive ratio ( try 4.11 for a start).
Move as much weight off the front of the vehicle and put it over the rear axle.
Put 90/10 shocks on front to increase front lift rate on acceleration.
Manually shift the trans starting in L, then 2, then 3.....
Have fun
