Differential lash question.

SG4247 · 01-22-2018, 06:52 PM

Well I set mine at .006” with used 3.69 gears. Thats max for the factory spec.

I thought that might be possibly a little loose and be noisey. I called my buddy at the race shop and he said the pinion depth is more of a contributer to noise than backlash is.

He said to set it up with the best contact pattern, and dont sweat the backlash number, which is what I did.

I havent installed it yet, so we will see..

Rusty · 01-22-2018, 10:57 PM

I'm going to be pulling my out soon for the OS Giken. So I'm interested in this.

B&W_Evader · 01-23-2018, 09:13 AM

Put some of that marking grease on it and look at the pattern. It will tell you if you need to mess with it. Study up... I don't think it's an easy task to get it right. That's why most shops won't mess with it.

B&W_Evader · 01-23-2018, 09:15 AM

Quote:

Originally Posted by Rusty

I'm going to be pulling my out soon for the OS Giken. So I'm interested in this.

My OS Giken went in perfect without needing to mess with the shims. I don't recall anyone needing to mess with the shims as long as they didn't change the gears.

SG4247 · 05-09-2018, 07:16 PM

Quote:

Originally Posted by SG4247

Well I set mine at .006” with used 3.69 gears. Thats max for the factory spec.

I thought that might be possibly a little loose and be noisey. I called my buddy at the race shop and he said the pinion depth is more of a contributer to noise than backlash is.

He said to set it up with the best contact pattern, and dont sweat the backlash number, which is what I did.

I havent installed it yet, so we will see..

Mine is quiet as a mouse after 10 dragstrip runs and 1000 miles of street cruising.

So nothing wrong with .006" backlash.

Rusty · 05-09-2018, 08:44 PM

Before installing the OS Giken. .0025" backlash.
After installing the OS Giken. '0025" backlash.

eastwest's was .0035" when I did his Z1 diff cover and SPL diff bushings.

Both ours patterns for drive and coast was good. Right in the middle. Mine doesn't make any noises that I can hear.

01-22-2018, 10:57 PM	#2 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,425 Drives: 2011 Nismo GM 6M Rep Power: 2684438	I'm going to be pulling my out soon for the OS Giken. So I'm interested in this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

01-23-2018, 09:13 AM	#3 (permalink)
B&W_Evader Track Member Join Date: Aug 2011 Location: CA Posts: 972 Drives: slower than before Rep Power: 387	Put some of that marking grease on it and look at the pattern. It will tell you if you need to mess with it. Study up... I don't think it's an easy task to get it right. That's why most shops won't mess with it. __________________ \|RIP\|6spd-sport\|OSG-LSD\|XP8\|RBF600\|Eibach Sways\|RE-71R\|FI-34Row\|Gen3-CAI\|Yaw P.S.\|

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01-22-2018, 06:52 PM	#1 (permalink)
SG4247 Track Member Join Date: Oct 2016 Location: OKC Posts: 810 Drives: 2010 touring Rep Power: 7842	Well I set mine at .006” with used 3.69 gears. Thats max for the factory spec. I thought that might be possibly a little loose and be noisey. I called my buddy at the race shop and he said the pinion depth is more of a contributer to noise than backlash is. He said to set it up with the best contact pattern, and dont sweat the backlash number, which is what I did. I havent installed it yet, so we will see..