Another Posi ?

[Fletcher6371]

Ok first thread... I've got a '71 C-10 with a 350/350 combo. My truck is a Frankenstein truck ('71 cab, '69 hood, '69 C-20 bed its got the side toolbox, '68 GMC bed floor, and Repo doors, fenders, inner fenders, and core support). I've replaced the front cab posts, cab corners, rockers, and floorboards to the tranny hump. I'm Rod-storing it. It looks like someone customized it in 1972. No big rims, no flashy audio (but a nice system), just a clean truck. When i opened the rear end i got a huge shocker, it was a posi rear end from the factory. My question is who made it and can i get parts for it. I've heard Eaton made it but nobody can say for sure. Any help? I'll post some pics when i figure out how to, LOL

[dubs68SWB]

What parts would you want??? I'm sure you could get a new clutch pack for it if the original ones are worn. Aside from a new ring and pinion, that's about it.

[71chevylowrider]

Does it look like this?
If so it is an Eaton Limited slip, (we call it Posi) Depending on your gear ratio it's a series 3 if it's 3.07 to 3.73, series 4 is 3.73 to 4.56

[Fletcher6371]

Yeah the clutch pack, springs, cage, etc. and where?!

[Fletcher6371]

Yeah it looks like that!!!!!!

[71chevylowrider]

You said look like what lowrider, You don't see the picture I posted?

[71chevylowrider]

If it looks like that with the 4 sprngs, then yes, you can buy a whole rebuild kit that has new springs & clutch pack & bearings. I think their around $120

[Fletcher6371]

Sorry it just didn't pop up untill i refreshed the page but yeah it looks like that.

[71chevylowrider]

Then your in luck, there's another posi unit that is made up of a **** load of little parts (I think they call it a gov lock) & they have problems, the one you have is the good one.

[Fletcher6371]

Ok.. four springs i can rebuild it. COOL. at least with my posi i won't be doing a One Wheel Peel all day like my buddy who's got another '71 but Orca (a.k.a. Puke Yellow LOL)

[dubs68SWB]

Originally Posted by 71chevylowrider

Then your in luck, there's another posi unit that is made up of a **** load of little parts (I think they call it a gov lock) & they have problems, the one you have is the good one.

Yes....do not rebuild a gov lock. Throw it away if you have any kind of power.

[71chevylowrider]

Exactly What He Said!

[Fletcher6371]

Thanks I LOVE THIS PLACE. Man i've been trying to figure that out for a couple weeks now and i just figured it out in a few min here!!!!

[71chevylowrider]

iI've seen the re-build kits on evil bay lots of times, but I just checked none there right now. Do a google search for GM 12 bolt Eaton Limited slip rebuild, they come with the 4 springs & bunch of clutch packs, just make sure you when you put it back in you 12 bolt housing, you put the shims back exatly how they were when you removed the carrier!

[71chevylowrider]

I hear ya man, I didn't know sh..it about these things till I posted it here about a year ago, now I've learned so much, I'm almost an expert myself, at least you have one, try buying one when you started out not even knowing that there's a HUGE difference between an Eaton 12 bolt limited slip carrier/unit for a passenger car & a truck, there's alot of sales scum out there that adverstise that the 12 bolt eaton they are selling fits chevelles & trucks, their full of ****! Only Truck carriers fit in truck 12 bolts & so on, Thank god for this site & the wonderful people on it, let me know if you ever need to adjust the kickdown cable on your th-350, that's another story, but I'mm an expert on that now too!

[dubs68SWB]

You also might find out that you don't have a shim pack....you will actually have 2 big spacers from the factory. It's important, if you do get another carrier, to set the backlash up the same. I got real lucky when I did mine. I had 2 big spacers and wound up being able to reuse them. I gained about .02 on the install, and then a trip around block will get me a .01 or .02 loss from everything seating in. You will need a dial indicator and a magnetic base if you try and do it yourself. You will also need limited slip gear oil and a high quality posi additive. The additive is a must. Please click on this link to see what your end result will be.........

http://s120.photobucket.com/albums/o...blackmarks.flv

[71chevylowrider]

He's right, if you don't set it up coreectly, your just making a grenade that will go off when you least expect it, check out this article, it may shed some light on the whole process.
http://www.hotrod.com/techarticles/c...ntial_install/