4WD - what should slip first??
 

When adjusting your diff and slipper on a 4wd, what should slip first?

Should the diff be slightly looser than the slipper or vice versa?

I've heard conflicting information in the past so can anyone help!

To test; I stop one wheel turning, hold the spur gear and turn the opposite wheel. if the prop turns the slipper is looser than the diff, and again vice versa, if the prop doesn't move the slipper is tighter than the diff... right?

Thanks.

The slipper should slip before the diff.

Exactly that. Not always easy to achieve, but if you want your diffs to last, the slipper should slip before the diffs.

lol! your dam right!

I've been at the buggers for around an hour.... the back diff feels nice, then adjust the slipper to suit and then the slipper feels to loose, tighten the slipper then the diff needs tightened and it feels to tight, then you get that somewhere near and you look at the front... arrrrggghh! :lol:

Try tightening the slipper all the way so there's no give, do the diffs then loosen the slipper to suit

set your diffs first with the slipper set tight, so you can feel if they slip. set the diff by holding the spur and turning both wheels together using a high grip surface like carpet. you wont get it right by turning one wheel and holding the other as the diff slips easier that way and it is easy to overtighten it causing excessive wear. its hard to describe the correct feel, its something you learn over the years, but basically when you drag the car along holding the spur and pushing down on the wishbones, the tyres should slide and the diff should also give a little too, although not much. do front and rear diffs seperately, setting the front a little tighter than the rear. once you have set your diffs then back off the slipper until it slips fairly easily by hand, adjust the slipper then under motor power on the surface you are going to be racing on, you want it to just give enough to stop the car popping up the front wheels, most of the time when giving the car full throttle from standby you should hear the slipper slipping for the first half second to one second only. bit long winded but hope it helps!

That's really great information and a great help.

Thanks guys :thumbsup:

Have a search on here for posts by myself about diffs. I did a good guide to building lazer diffs, shimming in the gearbox, breaking in and setting up.

I always do them the same way, recheck after the first run, adjust & then leave alone for about 6-8 meetings