10-bolt GM w/4:10 gears and an Eaton posi: pops & snaps - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-25-2012, 04:27 PM
Registered User
 
Join Date: Oct 2007
Location: Mother Lode Country
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
10-bolt GM w/4:10 gears and an Eaton posi: pops & snaps

I've got a 10-bolt GM with 4:10 gears and an Eaton posi unit. It has 35 spline axles. All supposedly in good condition. I have a receipt for a total rebuild (all the parts mentioned) from a reputable shop but they're no help. It has the additive specifically for posi units.

I just got the car on the road about a month ago. What's happening is that when I take it out, it starts off fine, but after driving around for a while I can hear loud snapping or grabbing and releasing sounds coming from the rear end. It's loud and nothing like the sounds some posi's make when turning.

It starts after about 45 minutes of easy city driving and sounds like it's not going to hold together much longer. It's very noticeable. I can hear it best when backing up or turning. But it only does it after driving it a bit. Even with the noises, it seems to run fine.

If it's worn out or broken why doesn't it make noises from the very get go. I can't see the gear oil breaking down but....heck, I don't know. Money's short right now and I don't want to take it in to a shop. I want to sell the car but I can't sell it like this. New posi in my future?

But shouldn't mine make noise all the time and have some symptoms of not working well? Somebody please school this boy.............
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-25-2012, 04:32 PM
gearheadslife's Avatar
MentalMuffinMan
 
Last photo:
Join Date: Nov 2012
Posts: 1,949
Wiki Edits: 0

Thanks: 80
Thanked 219 Times in 206 Posts
eaton posi with 35 spline?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-25-2012, 04:42 PM
Registered User
 
Join Date: Oct 2007
Location: Mother Lode Country
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What's going on?

Well why not just tell me. I don't know. I know many things you don't. Tell me the problem so I can fix it. Sheesh.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-25-2012, 04:43 PM
poncho62's Avatar
Out of the Loop Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 61
Posts: 16,781
Wiki Edits: 5

Thanks: 19
Thanked 231 Times in 191 Posts
Probably is the posi unit making noise...Take the cover off and have a look at it.......I would change the gear oil, put a good quality posi fluid in it.....If it still makes noise, then off to a shop
__________________
Ontario Rodders
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-25-2012, 05:02 PM
prostreet6t9's Avatar
Differential/Driveline
 
Last photo:
Join Date: Sep 2008
Location: oregon
Age: 50
Posts: 1,715
Wiki Edits: 0

Thanks: 5
Thanked 38 Times in 35 Posts
Grab ya a couple bottles of the ford motorsports additive Part#43161.

Sounds like the posi is chattering.

Your posi is a 28 or 30 spline. But either way put some additive in it and do some figure eight's to get it worked in.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-25-2012, 05:05 PM
big gear head's Avatar
High Performance Rear Ends
 
Last photo:
Join Date: Nov 2009
Location: Central City, KY
Posts: 1,924
Wiki Edits: 0

Thanks: 8
Thanked 330 Times in 286 Posts
You don't have 35 spline axles. At most you have 30 splines. You can get 35 spline axles with a spool, but the 8.5 10 bolt Eaton Posi is either 28 or 30 spline.

Change the oil. Use a good brand name 80W90 gear oil and a bottle of GM or Ford limited slip oil additive. Drive it around for a while and it should get better as you drive. While you have the cover off check for anything that doesn't look right, especially pieces in the bottom of the housing.

Last edited by big gear head; 11-25-2012 at 05:21 PM.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-25-2012, 05:12 PM
gearheadslife's Avatar
MentalMuffinMan
 
Last photo:
Join Date: Nov 2012
Posts: 1,949
Wiki Edits: 0

Thanks: 80
Thanked 219 Times in 206 Posts
Quote:
Originally Posted by Born Too Loose View Post
Well why not just tell me. I don't know. I know many things you don't. Tell me the problem so I can fix it. Sheesh.
Sir, we need correct info, to be able to HELP you..
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-25-2012, 05:34 PM
prostreet6t9's Avatar
Differential/Driveline
 
Last photo:
Join Date: Sep 2008
Location: oregon
Age: 50
Posts: 1,715
Wiki Edits: 0

Thanks: 5
Thanked 38 Times in 35 Posts
Quote:
Originally Posted by gearheadslife View Post
Sir, we need correct info, to be able to HELP you..
Really don't matter what the spline count is. All the Eaton posi's are built the same but just have different side gears.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 11-25-2012, 05:43 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 6,740
Wiki Edits: 0

Thanks: 236
Thanked 619 Times in 602 Posts
when my 12 bolt chattered real bad,we took out the clutches and shims and shuffled them and putit back together without the rat trap.We used 2 bottles of additive. if you take it apart,take a real close look at the spider gears
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 11-25-2012, 06:01 PM
prostreet6t9's Avatar
Differential/Driveline
 
Last photo:
Join Date: Sep 2008
Location: oregon
Age: 50
Posts: 1,715
Wiki Edits: 0

Thanks: 5
Thanked 38 Times in 35 Posts
[QUOTE=Born Too Loose;1615745].

I just got the car on the road about a month ago. What's happening is that when I take it out, it starts off fine, but after driving around for a while I can hear loud snapping or grabbing and releasing sounds coming from the rear end. It's loud and nothing like the sounds some posi's make when turning.

That statement is a common complaint with a new posi and chattering.

What brand of oil and additive did you use?
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 11-25-2012, 08:21 PM
Registered User
 
Join Date: Oct 2007
Location: Mother Lode Country
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
OK thanks guys. I bought the gear oil and additive at a NAPA store. Can't remember the names. I'll pull the cover and see what shakes then refill it and do some figure 8's. Been riding stroker Harleys most of my life (I'm 66). Them, I know. Cages? Not so much. Thanks again and Peace.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 11-25-2012, 11:09 PM
gearheadslife's Avatar
MentalMuffinMan
 
Last photo:
Join Date: Nov 2012
Posts: 1,949
Wiki Edits: 0

Thanks: 80
Thanked 219 Times in 206 Posts
Quote:
Originally Posted by prostreet6t9 View Post
Really don't matter what the spline count is. All the Eaton posi's are built the same but just have different side gears.
ya it does... 35 spline could be a locker or spool.. giving info "thinking its a eaton posi" won't help much..
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 11-26-2012, 05:58 AM
big gear head's Avatar
High Performance Rear Ends
 
Last photo:
Join Date: Nov 2009
Location: Central City, KY
Posts: 1,924
Wiki Edits: 0

Thanks: 8
Thanked 330 Times in 286 Posts
If you bought the oil additive at a auto parts store then that is where your problem is. Only the GM and Ford (possibly Chrysler too) additives work. The junk that the auto parts stores sell is no good.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 11-26-2012, 08:17 PM
prostreet6t9's Avatar
Differential/Driveline
 
Last photo:
Join Date: Sep 2008
Location: oregon
Age: 50
Posts: 1,715
Wiki Edits: 0

Thanks: 5
Thanked 38 Times in 35 Posts
Quote:
Originally Posted by gearheadslife View Post
ya it does... 35 spline could be a locker or spool.. giving info "thinking its a eaton posi" won't help much..
"I've got a 10-bolt GM with 4:10 gears and an Eaton posi unit. It has 35 spline axles.

I don't see the word "thinking" lol

Needless to say I'm sure it will fix the Op's problem with the info he gave.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Eaton posi 8.2 10 bolt? defilade Transmission - Rearend 1 12-12-2011 11:26 PM
GM Eaton 10 Bolt Posi (good Kind Needs spiders) sjkonyndyk Transmission - Rearend 2 12-06-2010 09:38 AM
10 bolt posi Auburn vs Eaton sanman Transmission - Rearend 3 04-30-2008 08:04 AM
Will open ended gears work on an eaton posi unit? batman09 Engine 5 01-01-2005 06:26 AM
Who has the best prices online for an eaton posi and gears? batman09 Engine 4 12-30-2004 08:57 AM


All times are GMT -6. The time now is 07:19 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.