Go Back   LS1TECH > CHASSIS, SUSPENSION, APPEARANCE > Gears & Axles
Sign in using an external account
Register Forgot Password?
Search

Gears & Axles
Driveshafts | Rearends | Differentials | Gears | 12 Bolt | 9 Inch | Dana
Sponsored by
JawsGear

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 04-27-2009, 01:22 AM   #1
TECH Addict
Garage is empty, add now
 
Ironxcross's Avatar
 
Trader Rating: 8
Join Date: Jun 2006
Posts: 2,063
Send a message via AIM to Ironxcross
Default Rear differential "slack", is this bad?

I noticed when putting in my U-joints that my rear diff has quite a bit of play in it. I believe this is why I get a "clunk" sound when I shift, its the rest of the drivetrain catching up.

Is there anyway to fix this conveniently? Is this bad?
Ironxcross is offline   Reply With Quote
Old 04-27-2009, 03:43 PM   #2
11 Second Club
Garage is empty, add now
 
Trader Rating: 24
Join Date: Feb 2005
Location: Baton Rouge, LA
Posts: 181
Default

That all depends. The "slack" you are talking about is your backlash. You would usually want this to be around .008" - .010" (Assuming you have a stock 7.5" 10-bolt). It is measured off of your ring gear. Excessive backlash is a good sign that you are on borrowed time.

It's a very easy fix... time for a 9" lol. Seriously though, it would probably require new gears, an install kit, and someone to install it.
__________________
Mike L.
mwill15 is offline   Reply With Quote
Old 04-27-2009, 04:39 PM   #3
TECH Senior Member
Garage is empty, add now
 
01ssreda4's Avatar
 
Trader Rating: 87
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 18,981
Default

Quote:
Originally Posted by mwill15 View Post
That all depends. The "slack" you are talking about is your backlash. You would usually want this to be around .008" - .010" (Assuming you have a stock 7.5" 10-bolt). It is measured off of your ring gear. Excessive backlash is a good sign that you are on borrowed time.

It's a very easy fix... time for a 9" lol. Seriously though, it would probably require new gears, an install kit, and someone to install it.
right, exactly what he said. prolly time for a rebuild.
__________________

01 SS Rally Red A4 #4987, 04 Yukon XL Denali, 99 Cadillac STS-SOLD
01ssreda4 is online now   Reply With Quote
Old 04-27-2009, 11:35 PM   #4
TECH Addict
Garage is empty, add now
 
Ironxcross's Avatar
 
Trader Rating: 8
Join Date: Jun 2006
Posts: 2,063
Send a message via AIM to Ironxcross
Default

the car has been this way since I bought it. I guess I should be easy on it until I find a way to fix this issue then.
Ironxcross is offline   Reply With Quote
Old 04-27-2009, 11:43 PM   #5
TECH Addict
Garage is empty, add now
 
Ironxcross's Avatar
 
Trader Rating: 8
Join Date: Jun 2006
Posts: 2,063
Send a message via AIM to Ironxcross
Default

Quote:
Originally Posted by mwill15 View Post
That all depends. The "slack" you are talking about is your backlash. You would usually want this to be around .008" - .010" (Assuming you have a stock 7.5" 10-bolt). It is measured off of your ring gear. Excessive backlash is a good sign that you are on borrowed time.

It's a very easy fix... time for a 9" lol. Seriously though, it would probably require new gears, an install kit, and someone to install it.
Well, to clarify, the "slack" I'm talking is when you turn the yoke. It takes about 20* of turning for it to begin turning the wheels. There isn't any play up or down/ in or out.
Ironxcross is offline   Reply With Quote
Old 04-28-2009, 12:47 PM   #6
11 Second Club
Garage is empty, add now
 
Trader Rating: 24
Join Date: Feb 2005
Location: Baton Rouge, LA
Posts: 181
Default

That's correct. Your pinion should never moove in/out or back/fourth. If you have 20* of rotation on the pinion, it's time for a new rear.
__________________
Mike L.
mwill15 is offline   Reply With Quote
Old 04-28-2009, 02:55 PM   #7
TECH Addict
Garage is empty, add now
 
Ironxcross's Avatar
 
Trader Rating: 8
Join Date: Jun 2006
Posts: 2,063
Send a message via AIM to Ironxcross
Default

Quote:
Originally Posted by mwill15 View Post
That's correct. Your pinion should never moove in/out or back/fourth. If you have 20* of rotation on the pinion, it's time for a new rear.
I don't think its that extreme, I'm not really sure at the moment. No other symptoms of the rear dying though.
Ironxcross is offline   Reply With Quote
Old 04-28-2009, 02:58 PM   #8
TECH Veteran
Garage is empty, add now
 
wrd1972's Avatar
 
Trader Rating: 12
Join Date: Mar 2006
Location: Central Kentucky
Posts: 4,521
Default

The majority of the "slack" you are describing comes from where the splined axle stubs slip loosely into the side spider gears in the diff. If the gears were responsible for it, they would be screaming bloody murder. This also makes the clunk.
__________________
1995 Z28 Convertible, M6 355ci LT1 DYNO 394 RWHP/370 RWTQ SAE thru the 9" Truetrac
Performance Mods 6" rod Mahle pistons, LE2 heads w/ Patriot xtremes, 226/232 LE cam, LE ported intake, Midwest 9" w/4.11's, K&N CAI, BBK 58MM TB, LPP Long tube headers no cats, Pro mag 1.6 RR's, Tuned by BLUECAT.Pic top down. Pic top up. Pics of my True Dual exhaust.
wrd1972 is offline   Reply With Quote
Old 04-28-2009, 03:32 PM   #9
TECH Addict
Garage is empty, add now
 
Ironxcross's Avatar
 
Trader Rating: 8
Join Date: Jun 2006
Posts: 2,063
Send a message via AIM to Ironxcross
Default

Quote:
Originally Posted by wrd1972 View Post
The majority of the "slack" you are describing comes from where the splined axle stubs slip loosely into the side spider gears in the diff. If the gears were responsible for it, they would be screaming bloody murder. This also makes the clunk.
So what you're saying is this is normal and I'm overreacting because my rear isn't making any other noises.
Ironxcross is offline   Reply With Quote
Old 04-28-2009, 04:02 PM   #10
Kleeborp the Moderator™
Garage is empty, add now
 
MeentSS02's Avatar
 
Trader Rating: 11
Join Date: Mar 2004
Location: Dayton, OH
Posts: 10,301
Default

My stock 10-bolt always had a bit more "slack" than I thought it should, but it was dead silent. My Strange 12-bolt has less slack, but the gears whine like a banshee - granted, I know the two aren't related, but that 10-bolt was good up until the day I sold it. I'm not sure what has happened to it since (it went in a car with a turbo and an automatic transmission), but I wouldn't worry too much about it.
__________________
2008 Viper
MeentSS02 is offline   Reply With Quote
Old 04-28-2009, 04:02 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Tags
backlash, bad, camaro, clunking, differential, excessive, firebird, formula, gear, gears, putting, rear, signs, slack, sound, symptoms


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rear "creek" Forward and Back RedLineWS6 Suspension & Brakes 6 06-04-2014 08:08 AM
Windows "alignment" help my2kTA General Maintenance & Repairs 8 12-03-2013 10:35 PM
Car has a "lawn mower" smell? L80Killa87 Generation III Internal Engine 4 10-28-2012 04:35 AM
weird "RATTLE" in back of car Circa307 General Maintenance & Repairs 17 04-11-2009 02:13 PM
15x8" or 15x10" Draglite for a 275/50 Nitto? 1 BAD GM Wheels & Tires 16 04-11-2004 06:57 PM



All times are GMT -5. The time now is 08:26 AM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details