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Old 04-08-2018, 01:01 PM
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12 bolt posi thrust washer installation tips, tricks?

Hi gents,
I hope you'll share some collective wisdom on this. As I was pulling the axles out of my 68's 12-bolt Eaton 2 series the 2 thrust washers between case + spider gears dropped (yep.. those little bastards) I've checked posts but am still not exactly clear as to if there is a preferred known method to re-install these ? Do you pry clutch springs out first, or spread side gears using a bolt? Any advice would be much appreciated and it'll save me from untold emotional outbursts.

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Old 04-09-2018, 07:07 AM
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Do not remove the springs. You will have a hard time getting them back in without removing the differential and taking the ring gear off of the Posi. There is a small hole in the other side of the case. It's easier to get the washers to go back between the gears and the case if you go through this small hole. Put some transmission assembly grease on them to keep them in place while you get the shaft back in.
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Old 04-09-2018, 03:18 PM
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Quote:
Originally Posted by big gear head View Post
Do not remove the springs. You will have a hard time getting them back in without removing the differential and taking the ring gear off of the Posi. There is a small hole in the other side of the case. It's easier to get the washers to go back between the gears and the case if you go through this small hole. Put some transmission assembly grease on them to keep them in place while you get the shaft back in.
Hi bighead, I'm a novice to differential and real glad to hear from you. ok so : 68 Malibu mutt/ current: 350 sbc muncie M20 / 2.5" drop coils, OEM frt+ r sway bars, bshngs,boxed rear lwr. cntl arms, lakewood ladder bars, 12 bolt Eaton limited slip/2 series 3959038NF (1969?) .410 ring gear (thick?) thrust washers drop when having difficult time sliding pinion shaft down lower bore (pin ok) there's surface damage on shaft where contacts spyder gear. Both axles are out.. do I pull out carrier to inspect case? pics below.. thanks man..

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Old 04-09-2018, 03:19 PM
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Hi bighead, I'm a novice to differential and real glad to hear from you. ok so : 68 Malibu mutt/ current: 350 sbc muncie M20 / 2.5" drop coils, OEM frt+ r sway bars, bshngs,boxed rear lwr. cntl arms, lakewood ladder bars, 12 bolt Eaton limited slip/2 series 3959038NF (1969?) .410 ring gear (thick?) thrust washers drop when having difficult time sliding pinion shaft down lower bore (pin ok) there's surface damage on shaft where contacts spyder gear. Both axles are out.. do I pull out carrier to inspect case? pics below.. thanks man..

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Old 04-09-2018, 03:21 PM
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Hi bighead, I'm a novice to differential and real glad to hear from you. ok so : 68 Malibu mutt/ current: 350 sbc muncie M20 / 2.5" drop coils, OEM frt+ r sway bars, bshngs,boxed rear lwr. cntl arms, lakewood ladder bars, 12 bolt Eaton limited slip/2 series 3959038NF (1969?) .410 ring gear (thick?) thrust washers drop when having difficult time sliding pinion shaft down lower bore (pin ok) there's surface damage on shaft where contacts spyder gear. Both axles are out.. do I pull out carrier to inspect? pics below.. thanks man..Click image for larger version

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Old 04-09-2018, 10:26 PM
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I'm guessing that you have a 3 series Eaton Posi and not a 2 series. Check the casting number on the Posi case next to the right bearing. It's probably going to be EDB 30140.

That pinion shaft is toast. It needs to be replaced. You also need to inspect the inside of the gear that it was running in and be sure that it isn't damaged. I'd say that by the looks of that shaft that you also need a new set of clutches.
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Old 04-10-2018, 12:25 AM
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The only way the pinion cross shaft gets tore up like that in a posi differential is when the clutches are toast....it is spinning one tire a lot faster than the other and thus working the spider gears hard.

On another note, I hope you are using the Lakewood bars for looks only, because they do nothing but bind up the rear suspension and ruin traction and handling. Caused by the front pivot point not being in the same plane as the front mount of the lower control arms.
Result is stiff suspension, that while it stops wheel-hop and so it seems like it helped traction, in reality the stiffness just results in a rear that easily just "skates" and looses traction from the get-go.
Just something for you to think about while your working in that area already..
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Old 04-11-2018, 01:01 AM
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Quote:
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The only way the pinion cross shaft gets tore up like that in a posi differential is when the clutches are toast....it is spinning one tire a lot faster than the other and thus working the spider gears hard.

On another note, I hope you are using the Lakewood bars for looks only, because they do nothing but bind up the rear suspension and ruin traction and handling. Caused by the front pivot point not being in the same plane as the front mount of the lower control arms.
Result is stiff suspension, that while it stops wheel-hop and so it seems like it helped traction, in reality the stiffness just results in a rear that easily just "skates" and looses traction from the get-go.
Just something for you to think about while your working in that area already..
I got great info to follow will do full rebuild to specs on posi, I agree these bars have single purpose design not street. They were installed when I bought the car and drove few times before began restoration remember how harsh ride. Admittedly lakewood give cool factor, but not at the cost of driveabilty. all other suspension components are new OEM so once full rebuild rear the ldr bars out lwr boxed cntrl arms sway bar factory 4 link should be more than adequate for normal service. thanks man
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Old 04-12-2018, 07:21 PM
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Quote:
Originally Posted by big gear head View Post
I'm guessing that you have a 3 series Eaton Posi and not a 2 series. Check the casting number on the Posi case next to the right bearing. It's probably going to be EDB 30140.

That pinion shaft is toast. It needs to be replaced. You also need to inspect the inside of the gear that it was running in and be sure that it isn't damaged. I'd say that by the looks of that shaft that you also need a new set of clutches.
Sorry for the late reply Bighead, I'v been gathering service info on GM 12 bolts and in next days will pull the posi carrier out to do step by step inspection (btw you're right it's a EBD 3014 Eaton 3 series w/200lbs springs) At this stage I know it'll need clutchs shims etc.. If things start looking daunting what do you think a reasonable shop labor charge to re-assemble internal case ? thanks
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Old 04-12-2018, 08:09 PM
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I was doing it for $60 a few years ago, which was too cheap. I don't know what someone would charge for it.
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Old 04-13-2018, 08:44 AM
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Eaton sells the clutch pack kits with the shims, 29403
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Old 04-22-2018, 05:51 PM
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Quote:
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I was doing it for $60 a few years ago, which was too cheap. I don't know what someone would charge for it.
​Hi, I don't mean to drag this on I know you're the go to for all things GM diff and I have pics of my working project and would really appreciate your expert eye. I didn't see debris draining lube or in case when removing carrier and found the following: slight damage side gear bearing, scoured surfaces spider gear+ side gears + case, several broken clutch discs, It's my understanding it would better deal to get new unit than replacing all the worn parts. But I was informed that in my current financial predicament I can only afford the minimal cost needed to get the car to move on its own power, or I can learn how to cook for myself if you know what I mean. thanks


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Old 04-22-2018, 06:27 PM
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Old 04-22-2018, 06:30 PM
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The internal gear kit from Dana Spicer is # 2023882
https://www.summitracing.com/parts/svl-2023882/
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Old 04-22-2018, 06:43 PM
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Quote:
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I was doing it for $60 a few years ago, which was too cheap. I don't know what someone would charge for it.
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