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

12-bolt Break-in question

Thread Tools
 
Search this Thread
 
Old Feb 17, 2008 | 03:05 PM
  #1  
SlayerMaro's Avatar
Thread Starter
11 Second Club
iTrader: (3)
 
Joined: Aug 2007
Posts: 369
Likes: 1
Default 12-bolt Break-in question

I searched about this problem but I didn't find an answer.

I recently had a 12-bolt installed with several other mods. When making very sharp turns (like when parking), the wheels don't seem to want to turn at different rates. The tires scrape against the pavement, and the car shakes. I've put maybe 230 miles on the 12-bolt so far. Is this normal during break-in, or does it need more fluids, or what?

Thanks for any help.
Reply
Old Feb 17, 2008 | 03:07 PM
  #2  
chvycmaroz28's Avatar
Launching!
20 Year Member
Photogenic
Liked
iTrader: (1)
 
Joined: Apr 2006
Posts: 254
Likes: 1
From: New Hartford,NY
Default

the only thing i can think of is u might have a locker in there
Reply
Old Feb 17, 2008 | 03:33 PM
  #3  
EPP's Avatar
EPP
FormerVendor
iTrader: (22)
 
Joined: Mar 2003
Posts: 13,063
Likes: 2
Default

Originally Posted by SlayerMaro
I searched about this problem but I didn't find an answer.

I recently had a 12-bolt installed with several other mods. When making very sharp turns (like when parking), the wheels don't seem to want to turn at different rates. The tires scrape against the pavement, and the car shakes. I've put maybe 230 miles on the 12-bolt so far. Is this normal during break-in, or does it need more fluids, or what?

Thanks for any help.
It sounds like you may have an Eaton posi and might need more posi additive. Bob
Reply
Old Feb 17, 2008 | 03:54 PM
  #4  
alamantia's Avatar
TECH Fanatic
15 Year Member
iTrader: (10)
 
Joined: Apr 2006
Posts: 1,323
Likes: 1
From: NJ
Default

http://www.amazon.com/K-Posi-Trac-Li...285240&sr=1-10
Reply
Old Feb 18, 2008 | 05:03 AM
  #5  
revtime's Avatar
TECH Resident
iTrader: (1)
 
Joined: Apr 2006
Posts: 819
Likes: 0
From: OMG I'm in Kansas
Default

Find out what posi unit was installed. Make sure they did not put a spool in it.
Reply
Old Feb 18, 2008 | 10:27 AM
  #6  
SlayerMaro's Avatar
Thread Starter
11 Second Club
iTrader: (3)
 
Joined: Aug 2007
Posts: 369
Likes: 1
Default

It should have a 33 spline spool in it. Does that change anything?

I'll check on the fluids. Thanks for the help!
Reply
Old Feb 18, 2008 | 10:46 AM
  #7  
SlayerMaro's Avatar
Thread Starter
11 Second Club
iTrader: (3)
 
Joined: Aug 2007
Posts: 369
Likes: 1
Default

Hmmm...I just did a search and it looks like these problems around tight turns will always be there in a spool rear end. At least it won't be as noticable when I get some drag radials on the car, and I'll take comfort in the fact that my rear is pretty damn strong.
Reply
Old Feb 18, 2008 | 10:52 AM
  #8  
BlackScreaminMachine's Avatar
Internet Mechanic
20 Year Member
iTrader: (17)
 
Joined: May 2005
Posts: 9,830
Likes: 2
From: Wallingford CT
Default

My Tru Trac did the same thing but it was a ORIGINAL unit, NOT a Eaton "updated" unit. I broke it and it acted like a locker around the corners. It sucked alot
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Feb 18, 2008 | 11:58 AM
  #9  
Jawsgear's Avatar
FormerVendor
iTrader: (2)
 
Joined: Dec 2007
Posts: 761
Likes: 0
From: Sacramento, California
Default

If this is a spool, you will definately be dragging the wheel around the corner. That is what a spool is designed to do. No give around corners, locked up 100% all the time.

Jeff
Reply
Old Feb 18, 2008 | 12:30 PM
  #10  
Tracker9118's Avatar
Registered User
 
Joined: Jan 2008
Posts: 6
Likes: 0
From: Ohio
Default

Originally Posted by SlayerMaro
I searched about this problem but I didn't find an answer.

I recently had a 12-bolt installed with several other mods. When making very sharp turns (like when parking), the wheels don't seem to want to turn at different rates. The tires scrape against the pavement, and the car shakes. I've put maybe 230 miles on the 12-bolt so far. Is this normal during break-in, or does it need more fluids, or what?

Thanks for any help.
DID YOU USE ANY POSI-ADDITIVE
Reply
Old Feb 18, 2008 | 12:41 PM
  #11  
SlayerMaro's Avatar
Thread Starter
11 Second Club
iTrader: (3)
 
Joined: Aug 2007
Posts: 369
Likes: 1
Default

My shop took care of the work. They added the proper fluids. As you can see above, it's a spool. Spools don't mix well with corners. Relax.
Reply




All times are GMT -5. The time now is 06:21 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE