Results 1 to 16 of 16

Eaton Truetrac

This is a discussion on Eaton Truetrac within the Drivetrain forums, part of the LSx Technical Help Section category; Picked up my Moser 12 bolt from the speed shop on Thursday. After we got it home, I unpacked everything ...

  1. #1
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Eaton Truetrac

    Picked up my Moser 12 bolt from the speed shop on Thursday. After we got it home, I unpacked everything to check it out. Wanted to make sure the axle splines matched the innards, but when I slid them in they stopped just under an inch short of where they need to be.

    It appears that the posi unit has the c-clip spacer installed even though the axles I ordered are retained by the backer plates. The directions are not very clear, so I assume I simply have to remove the spacer. Do I reinstall the plug in the side of the posi after removal, or just leave it out as well? Or, is there any chance that this is not the correct unit for my axles? The only reason I ask is that the instructions seem to suggest specific setups for c-clip versus non-c-clip retained axles.

    I checked the Moser website and could not find any information on this. Their "Moser Forum" is apparently down for maintenance. The instructions are linked here: http://www.eaton.com/ecm/groups/publ.../ct_128482.pdf

  2. #2
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Here are some pics of the setup. The red circle in the shot down the axle tube shows what I think is the c-clip spacer. I'm not sure, maybe it is simply the bottom of the access plate. The other pic is of the access plate in the side of the posi unit. The axles definitely hit on this before reaching the point they would need to be inserted for the bearing to be fully seated in the end of the tube.





  3. #3
    I like turtles GTP231's Avatar
    Join Date
    Aug 2007
    Location
    Corn and Soybean fields
    Posts
    5,397

    Gray/ White
    10 Impreza 83 Thunderturd

    Sure you have the axle lined up right so it'll slide into the diff itself? I'd be on the phone with Moser trying to get some answers. I'm assuming you're looking down the diff in the 1st photo?

  4. #4
    Giant Dicks Car Club Zapper2003's Avatar
    Join Date
    Nov 2006
    Location
    Millerton, PA
    Posts
    5,144

    2005 Ram
    1978 Firebird

    Jeff, thats the exact same diff that I put in my car. It looks to me like they mighta shafted you a bit here. That piece in the center, the round disc, is very hard to install once the gear is in place as its machined very tight and dropping it straight in is nearly impossible because of the tips of the gear teeth. Regardless, it does fit. It's tapped 1/4" in the center to attach a bolt to pull it out, it does not fit tight. If I can find my install instructions, I'll take a peek and see what it says about non clipped axles. Mind you, mine is still a 10 Bolt with c's, but I can't imagine the design to be much different.

  5. #5
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by GTP231 View Post
    Sure you have the axle lined up right so it'll slide into the diff itself? I'd be on the phone with Moser trying to get some answers. I'm assuming you're looking down the diff in the 1st photo?

    Axles slide right in and engage the splines -- but then stop when they get to what I beleive is either the access plug or c-clip spacer. First photo is looking down the axle tube -- you can see the protrusion that the axles hit on. They are stopping about 1/2" - 3/4" from where they need to be.

  6. #6
    Giant Dicks Car Club Zapper2003's Avatar
    Join Date
    Nov 2006
    Location
    Millerton, PA
    Posts
    5,144

    2005 Ram
    1978 Firebird

    Alright Jeff. Just re-read your first post. All they have installed in your car is the retainer plate for the c-clip axle spacer. If you can see directly straight through your diff, the spacer isn't installed, only the retaining plate. I have a picture to upload shortly for your viewing pleasure.

  7. #7
    Giant Dicks Car Club Zapper2003's Avatar
    Join Date
    Nov 2006
    Location
    Millerton, PA
    Posts
    5,144

    2005 Ram
    1978 Firebird

    Okay, here's the pictures. As for what to do to install your current axles, Jeff, you'll probably have to make a phone call to Eaton and ask their tech department. My instructions do not tell me how to handle this situation, however, I don't think the retaining cylinder is necessary for correct operation. My only worry would be balancing (no retaining cylinder offsets the weight of the diff a bit), however, it could be so close to the center of movement that it would not matter much (similar to a brake rotor being off balance vs. the tire).





  8. #8
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by Zapper2003 View Post
    Jeff, thats the exact same diff that I put in my car. It looks to me like they mighta shafted you a bit here. That piece in the center, the round disc, is very hard to install once the gear is in place as its machined very tight and dropping it straight in is nearly impossible because of the tips of the gear teeth. Regardless, it does fit. It's tapped 1/4" in the center to attach a bolt to pull it out, it does not fit tight. If I can find my install instructions, I'll take a peek and see what it says about non clipped axles. Mind you, mine is still a 10 Bolt with c's, but I can't imagine the design to be much different.

    I'm certainly stumped -- I'm heading home in a few and will pick this up again from there.


    Quote Originally Posted by Zapper2003 View Post
    Alright Jeff. Just re-read your first post. All they have installed in your car is the retainer plate for the c-clip axle spacer. If you can see directly straight through your diff, the spacer isn't installed, only the retaining plate. I have a picture to upload shortly for your viewing pleasure.

    Cool. Let me know if you need a pic of anything else on it.

  9. #9
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Quote Originally Posted by Zapper2003 View Post
    Click for full size

    Click for full size

    That helps -- so it's just the retainer and no spacer. The instructions are so damn vague I figured that they were written by a lawyer!

  10. #10
    Giant Dicks Car Club Zapper2003's Avatar
    Join Date
    Nov 2006
    Location
    Millerton, PA
    Posts
    5,144

    2005 Ram
    1978 Firebird

    Yes, the instructions really offered NO advice for me whatsoever, it doesn't even show this design!

    Assuming you're familiar with the c-clip axles, if you previously had this rearend installed in the car what you'd have to do in order to pull the axles would be to pop off the snap ring, then pull out the retainer, and lastly get the spacer our via magnet or rotating the diff down and dropping it out, then pushing the axles IN to disengage the c-clips from their grooves, then remove them from the axles via magnet or dropping them off as well, then you pull the axle. The way I see it, if you took all of these parts out and had your backing plate retained axles installed, there's no need or reason for any of those parts to be put back in.


    Like I said though, call Moser first and make sure they didn't mess up and sell you the wrong diff, secondly, call Eaton and make 100% sure that it IS the correct unit for your application and make sure that not reinstalling the spacer/retainer isn't gonna screw anything up. The spacer was only in there to separate the axles and keep the clips in their grooves in the side gears, and the only reason the retainer is in there is to keep the spacer in its place. Mine all came shipped loose and nothing fell out of the diff, so I really don't see how not having them in could be any kind of problem.

  11. #11
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    I am going to head back out in the garage and look it all over again. I sent an e-mail off to Moser on Saturday, but no reply as of yet. I have some time tomorrow and will try to get a call out to them. If you get down our way after the holiday stop in and check it out.

  12. #12
    Giant Dicks Car Club Zapper2003's Avatar
    Join Date
    Nov 2006
    Location
    Millerton, PA
    Posts
    5,144

    2005 Ram
    1978 Firebird

    Yeah if I get down that way (weather pending of course) I'll see what I can do.

  13. #13
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    Wow. I can be amazingly dumb at times.

    Went back out into the garage to take another gander. Measured the axles, looked things over again, and then decided to check the bearings. Turns out I was looking at the wrong step on the axle. Having rear disc brakes, I figured the bearing would seat against the outermost step. It doesn't. The bearing seats against the first step, which means that everything is just fine.

    Here's the bearing next to the axle:





    This shows the steps as the axle is slid into the housing:





    And this is where the axle will ride when the bearing is pressed on:





    I have no idea what the hell I was thinking.

  14. #14
    Giant Dicks Car Club Zapper2003's Avatar
    Join Date
    Nov 2006
    Location
    Millerton, PA
    Posts
    5,144

    2005 Ram
    1978 Firebird

    , so there's nothing wrong with the diff, you just need to get the bearings pressed onto the axle shafts?

  15. #15
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,567

    Black & Blue
    '02 WS.6 / '07 Suburban

    I need to swap over the backer plates from the existing axle before I press the bearing and lock ring on. What's funny is that my friend also looked at it and thought the same thing I did. It's been a few too many years since I have had to swap out an axle bearing, that's all I can say.

  16. #16
    Giant Dicks Car Club Zapper2003's Avatar
    Join Date
    Nov 2006
    Location
    Millerton, PA
    Posts
    5,144

    2005 Ram
    1978 Firebird

    at least it'll be that easy.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Dana S60...TrueTrac, Spool, or Detroit Locker which one?
    By 98TransAmWs-6 in forum Drivetrain
    Replies: 50
    Last Post: 03-06-2014, 05:19 AM
  2. Posi Vs. Truetrac
    By LeadFarmer in forum Drivetrain
    Replies: 1
    Last Post: 03-27-2013, 05:41 PM
  3. Question: TrueTrac Axle Endplay
    By Wesman in forum Drivetrain
    Replies: 25
    Last Post: 06-09-2011, 04:37 AM
  4. Eaton 112?
    By predator in forum External Engine
    Replies: 0
    Last Post: 03-10-2008, 11:26 AM
  5. New: Moser 9", TrueTrac. 3.50's, Strange drag brakes
    By xssive in forum Parts For Sale / Trade
    Replies: 5
    Last Post: 07-05-2007, 02:42 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •