First, when tightening down the tranny bolts, I make sure there is no unnecessary force needed to turn tranny by hand. I like to adjust the slipper clutch at the track/surface I'm running on. Or if my RC is clean, I'll adjust slipper in house; on the carpet for a great baseline setting...slipping for about 2' when pulling trigger to full throttle. This way, when I go to the track and get into some loose conditions, I can still induce some rear end fishtailing fun on my 2wd platforms.

You'll see some folk holding down both rear tires, and trying to get the front end lift off the ground when pulling the trigger full throttle. Not the best idea, especially for 2wd short course trucks as the front end is considerably heavier than a buggy, or stadium truck. Doing so puts too much unneeded stress on diffs/tranny. I push my RCs away from me, then yank on the throttle while listening for the slippage I want. The video below (@ 7:28) is basically how I always set my slipper clutch on all my RCs.