foo

Im looking for a reference for a the tooth contact pattern.

This is what i have so far:

monzaz

Need to know the shim thickness and the backlash measurement.

It is looking good so far. Do more than just a few teeth you want to see it you have any inconsistent teeth and run out. try a bit more oil on the gear too will help the pattern come out better.

Jim
JD

Run to Rund

Make sure the backlash is within spec when you check the pattern.

foo

whats a good method of putting load on the gear without breaks installed, ive been putting my weight on it and i crank it, back lash is at .007 -.008 last I checked

507OLDS

That yellow compound needs a little oil to thin it out for a better reading,but your patterns look good so far.The .007"-.008" is good.I would like to see more of the coast pattern.
Do a few more areas to see if the pattern changes.

monzaz

When we get a better liquid pattern...then you will see the tail of the pattern. If it is high then maybe .001 deeper if it is low maybe .001 shallower. Will see. Even if you widen the backlash to .010 the pattern seems to show better then you car tighten it up on final assembly. Jim

JD

foo

now that is got warmer out here a new look with some oil on the markings and more teeth covered.

foo

foo

What do you guys think about this one?

monzaz

Looks pretty decent. But you really need to give the backlash and the pinion depth that helps me determine what to do. Jim

foo

backlash is still .07-.08 pinion depth is about .078in if you go by the shims on it

monzaz

pinion shim is .078? That can not be correct????
should be around .040 or less

Double check that shim thickness... looks to be ok pattern...???

I can say I have NEVER ever had one that thick EVER.

foo

yeah I was trying to figure it off my head went and checked its .031ish :P

foo

moved pinion to .02, the backlash changed to .20 so frustration kicked in after taking it apart a few times already and had leave it for a bit before i take it all apart again for the right backlash and check pattern.

foo

Is there a point were there is just too much shim thickness to make backlash into spec. im at the point where It is insane to get my shims into place while still having backlash of about .20, pinion is at .02?
or should I just change the pinion back to .03

507OLDS

You should have about .008" backlash to be ideal.

foo

I got that part I had that before I switch my pinion depth now since Its changed to .020( I left out a zero before) but it is insane hard to add more shims to change it to .008. Am i doing something wrong or should I go back to the previous pinion depth and side shims in which gave me backlash of .007-.008?

507OLDS

Each time you try another pinion depth,you also need to achieve .008" backlash,to give a correct pattern.

foo

ok to try an put this rear end to rest, if I cant fit anymore shims to get the corrct backlash(Its way too tight,to the point its shaving the shims), am i going to have to move the pinion in more

507OLDS

You need a pretty good assortment of carrier shims to play around with,to achieve the correct backlash,and yet still maintain good preload on the carrier bearings.

monzaz

WHY- Why did you change your pinion shim? That is what gives you the correct depth and pattern at .006-.010 backlash. What are you doing?

First you need the correct depth shim (pinion shim) usually in the .040-.035 range...In your case seems to be .031? to me this would throw a RED flag But as long as the pattern looks good and the gear spins smooth AND your backlash is with in the range I listed you are good.

NOW you put a .020 shim under the pinion THAT IS WHAT you lost your backlash and i guarantee you have also lost your PATTERN and this will MAKE NOIse.


PLEASE put the rear back at the shim you got the good patterns with - IF you do not have a shim pack with multiple thick shims CALL ME... I will get you some 5.00 no biggie. This will give you enough carrier shims to make both left and right carrier shim any thickness from .200-.300 in .005 increments.

PLEASE, please put it back. Jim

JIM'S w30

monzaz you are wasting your time, he had the gears set the first time, I do gears for a living in canada and we both know the pattern was good, also he probably thinks the gear should be wipped right accoss the hole tooth, just get the diff sent to you and set it up for him so it's done right

foo

I have long finished this rearend, since it was my first time i wanted everything to be okayed before I made it all set. You are wasting everyone time by trolling a old post like this thinking you know exactly what has been going on with these gears, carrier and monzaz