Factory posi

[GMTECH12002]

Not sure where to ask this question but here we go, is there anything I can do for my possi unit in my 87 gn to increase clutch pressure, anything from a known good additive to maybe changing springs or adding a clutch plate

 

[HouTX87]

What's wrong with it?

 

[charlief1]

If it's factory then you can rebuild it if you can find the parts. Get stronger springs for it at the same time.

 

[GMTECH12002]

just on occassion it will kick out 1 wheel, where might i find a rebuild kit and stronger springs?

 

[HouTX87]

If it were me I'd upgrade to a new eaton posi and be done with it.

 

[GMTECH12002]

I have a 59k mile car I'm hoping to not have to buy a new unit but maybe put some good clutch conditioner in or maybe upgrade the springs and keep my factory setup, this way I don't need to resetup the clearances for the carrier bearings

 

[HouTX87]

Has it ever been serviced? Sometimes changing the fluid can clear things up. I've heard this fluid is highly recommended. Plan to try it myself soon. Maybe service it first and see if it improves?

http://www.summitracing.com/search/.../product-line/lakewood-limited-slip-gear-lube

 

[GMTECH12002]

may just try that.

 

[TexasT]

If it's factory then you can rebuild it if you can find the parts. Get stronger springs for it at the same time.

I saw a post on another board that touted a rebuild kit for $199. I'll see if I can find it again. It did note that the spider gears are not being reproduced.

 

[GMTECH12002]

That would be great if you can find it

 

[TexasT]

http://classicoldsmobile.com/forums...als/44882-8-5-posi-clutches-new-supplier.html

 

[novaderrik]

the rebuild kit used to be available from GM- the same posi unit was used in across the lineup from the Camaro to 1/2 ton trucks for about 25 years, so they sold quite a few of them.. but GM stopped selling it a while back, i think..
but, yeah, change the fluid and see if that helps... i like the Amsoil premium gear oil and haven't ever needed to use a posi additive in anything i've put it in..

 

[lost2a6]

I got some shims from Tom's Differentials along with rebuilding it and mine works perfect. According to him, if it's shimmed right, you really don't even need the spring. http://www.tomsdifferentials.com/