Too stiff of springs, too small of shock piston holes, or too stiff of swaybars could cause this as well.


Thinner rear diff oil may cure this. Softer rear suspension/stiffer front suspension could do the same by limiting weight transfer. Softer clutch springs could also aid in more controlled acceleration.

EDIT: Look to the opposite end of the car first to correct the problem. Car setup is a game of weight transfer. If your rear end is loose, try tightening up the front end. If the rear end acts too stiff, try correcting by stiffening the front. I don't know if they make thinner diff oil than 1k, so you may have to look for other alternatives to solve your on power acceleration issues, including perhaps different tire selection. Fewer/taller knobs for soft loose soil, more/smaller knobs for firm packed soil.