I can't find the back lash spec for a lsd diff

[iwantspeed]

Hello guys
I was wondering what range of backlash spec was ok

[jlevie]

That is closely held information. I've not found an authoritative source, nor have I yet tried setting up a diff with what I have found. The data I have found suggests:

Backlash .06-.14mm (.0024-.0055in)
Preload ~.20nm (21-28in-oz)

I don't know if those numbers are exactly right, but they seem reasonable.

[iwantspeed]

That is closely held information. I've not found an authoritative source, nor have I yet tried setting up a diff with what I have found. The data I have found suggests:

Backlash .06-.14mm (.0024-.0055in)
Preload ~.20nm (21-28in-oz)

I don't know if those numbers are exactly right, but they seem reasonable.

Thank Jim
I just checked the back lash on my lsd diff,and I'm stoaked to find it to be only 0.003 thousands on the drive side of the ring gear and on the coast side of the ring gear.

[jlevie]

3 thou in each direction is 6 thou total. Which is a touch on the high side, but probably okay. The other measurement of interest is the contact pattern of the pinion on the ring gear. If the pinion depth is connect the pattern will be centered on the ring gear teeth. You check the contact pattern by coating some of the ring gear teeth prussian blue or the orange stuff, rotate the ring gear a couple of times in both directions, and examine the marked part of the ring gear for where the contact occurs. If not centered the shims on the pinion shaft need adjustment. Which in turn may affect backlash and require changing the output shaft shims. Getting it right is something of an iterative process.