Rear Diff Rebuild - Pattern Check (1 Viewer)

[Vae Victus]

I'm finishing the rebuild of my rear diff. I have patterned the gears, and believe I have an acceptable pattern, but would like to see if it really warrants messing with pulling the pinion bearing and trying multiple other shims +/- to see if the pattern improves.

As background, this is a full frame off that I'm 3 (slow, yes) years into, taking my time.

I don't mind getting a pinion shim kit, but don't currently have one. Pattern with original shim seems to be good:
- Drive: Centered both horizontally and vertically. Covers about 70% of the tooth.
- Coast: Centered vertically, but towards the inside of the tooth (toe side). Covers about 50% of the tooth.

Love any feedback. First Diff.

New Koyo bearings (CruiserOutfitters kit). Backlash is 0.009". Have not yet set the crush collar on the pinion.

Photos:

 

[B y r o n]

Do what I did and E-mail ZUK's at gearinstalls@gmail.com as I believe he is an expert on this topic. He will be able to tell you in more detail what may be needed for the best results.

You may be able to get a better idea too by looking at some of the information and images from his site.

 

[78fj40mg]

It looks like you have real good contact, I say you are good to go!

 

[mdsims]

Zuk is a great resource. He posts images to his site that may be helpful. Here is one example. Toyota gear install

 

[Vae Victus]

Thanks guys!

 

[Weber Sarge]

Just a tip when trying to get a decent pattern - put a glove on one hand and hold it against the outer part of the ring gear for some drag pressure while turning the pinion , it will help to put a clearer, defined mark on the teeth that is easier to read .

I hate crush sleeves and trying to get the initial crush on them , seriously prefer the shim method .
Sarge

 

[Dynosoar]

If you are doing all this work anyway have you considered using a solid spacer and NOT a crush sleeve? It really is a better way to go.

Dyno

 

[Vae Victus]

If you are doing all this work anyway have you considered using a solid spacer and NOT a crush sleeve? It really is a better way to go.

Dyno

I read about them somewhere but don't understand the difference in setup. I'll research that, thanks for the tip.

 

[Vae Victus]

Ken (Zuk) says I could go 0.005 or 0.006 deeper.

He sent me this, thought I'd document it here:

41201D WASHER, PLATE (FOR REAR DIFFERENTIAL DRIVE PINION)
90201-40551 T=1.05, T=1.05 1 $5.77
90201-40552 T=1.10, T=1.10 1 $5.77
90201-40553 T=1.15, T=1.15 1 $6.05
90201-40554 T=1.20, T=1.20 1 $6.05
90201-40555 T=1.25, T=1.25 1 $6.05
90201-40556 T=1.30, T=1.30 1 $6.40
90201-40557 T=1.35, T=1.35 1 $6.40
90201-40558 T=1.40, T=1.40 1 $6.40
90201-40559 T=1.45, T=1.45 1 $6.40
90201-40560 T=1.50, T=1.50 1 $6.40
90201-40561 T=1.55, T=1.55 1 $6.40

He also said to order the 1.35 thru 1.5mm shims from the list above for my needs.