Very Bad Vibration

[s1ngletracker]

Good to know. I've read a couple threads on getting the correct pattern. Some mention to measure backlash before painting the teeth and doing the pattern test. Any thoughts on that?
I'm going to remove the diff today and take a look.

If you're removing the diff then measure backlash and gear contact pattern.

Should be plenty of internet resources that can tell you how.

[mark4g63t]

Heres before it comes out. I think you guy's are right with it being something to do with the rear diff. I don't have a tool to measure backlash. Anyone on here have something?
I'm guessing this is way out of spec and should be less.
https://www.youtube.com/watch?v=PNoNwndyN9c

[s1ngletracker]

that's quite a bit, certainly out of spec. Although 5mph vibration worthy? We'll see I guess!

[mark4g63t]

Still need to get the gear marking compound but here's just a quick look inside.

[b00sted_spyder]

Lol, looks to me like there is no preload. Definitely not good. That pinion and differential needs to be shimmed and have the preload set correctly.

[mark4g63t]

Feels like there could be none when driving lol
The vibration does get a lot worse with increased speed.
Might double check my work and that there is actually a shim on the 5 speed pinion gear/shaft I got.

[mark4g63t]

Well this is what I got so far. Confused as to which is the shim. I'm guessing it's the one my finger is pointed at because the one i'm pointing out with the screwdriver looks to be the same on both shafts and non removable.
If it is the one i'm pointing at with my finger than that is being used from my old gear set along with the sleeve which could explain why the new gears would be off.
Proven Force be able to help me with this? I don't have any dials or anything to measure with. I'm guessing it needs a thicker shim to move the gears more towards the center?


Just noticed the one my finger is pointed is a thick and thin "shim" if that's what those are. Here's a pic of what I mean

[s1ngletracker]

there are 2 shims, outer and inner. To move the pinion in/out, you have to change both accordingly, as the distance between the nut and the gear is fixed and you need to fill it with shims, bearings, etc.

I'm sure proven force can help you. No idea how much they charge.

A dial indicator is maybe $20 at HF and is accurate enough for your purposes.

The problem is if you need to change shims, you'll have to order the full set for each shim, and I think it was maybe around a $80-$100 investment for all of them. I might have spares i'd sell individually if you determine what size you need.

Do you have a factory service manual? I highly encourage it for all DSMers.

[mark4g63t]

Ok I will look into that HF dial. I do not have a service manual, just the good ole Chiltons. Where did you order these shims from? TMZ, Jacks, Proven Force, Ebay? lol

[b00sted_spyder]

Proven Force is helping you right now. Lol, I work for Proven Force. But im sure Chuck at Proven Force can help you find those shims. Otherwise I'm sure we can build it for you.