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I have never raced a 4wd car before. Now I have a Yoke and a Schumacher which I plan to run and I am thinking about how to properly adjust the ball diffs. When I raced 2wd in the early nineties it was simple: Crank down the slipper hit the throttle and tighten the diff until it does not slip. Loosen the slipper to the desired slippage. After awhile I was able to tell just by feel(turning one tire).

But how do you make sure your diffs are not slipping on a 4wd. Would you disable the front, adjust the back and then disable the rear and do the front. Is there an easier way? What techniques do you guys use to adjust your diffs?

Cheers

I usually do the same thing, regardless of type of car.

I'll lock the gear or tires, whichever is easier, then try to spin the other(wheels/gear, respectively) with my hands(if tires, the same direction to make it slip). I'll initially set the diff so that it will slip, and gradually tighten until I can't make it slip with some effort. make sure you spin the diff a little in between to make sure everything is fully seated and flat. then check how 'tight' the diff action feels. If it feels really stiff, notchy, or rough, I'll back it off a touch, so that I can just make it slip and the diff action feels good.

it takes a few times to get the feel, then you can always go back to adjust for the feel, like you mentioned. once you are close, you should be able to tweak it just a little either way to adjust your driving preference.

yoke diffs pretty easy tbh do the hex screw up all the way then undo it about 45 degrees and it should be good to go.
havent got the slightest idea about a shuey