3rd member

[bigblockwilly]

Can a 3rd member standard case be used with a posi with modification. If so what modifications need to be made.

Thanks
Bigblockwillybang

 

[models916]

Aftermarket fits

Eaton, Auburn, Strange posi fits the open case. GM original needs some grinding up next to the pinion somewhere. I would go aftermarket, easier on replacement parts and a bit stronger for around $450.00. Summit sells them.

 

[b-d409]

Open Case Cutout

Here are couple pictures that show what needs to be done to use an original style posi in an open case.

Dan

 

[petepedlar]

Do you have to do the same for the aftermarket posi's?

Thanks
Dave

 

[gabriel-cestaro]

i had mine done i used a strange posi i bought the parts and brought them to rear end shop too install charge me 75.00 works great

 

[petepedlar]

Thanks Gabe, the Strange is cheaper than the Eaton as well, at least on the net.
Dave

 

[Impalaguru]

Those are some interesting cap girdles. Where did you get them?
Ross

 

[b-d409]

Cap Girdles

Ross,

My brother-in-law made them for me. He's a machinist at a local tool and die shop. I am using them on my 3.08 and 4.11 rear ends. He will be making some more for me pretty soon so if you want a set PM me.

Dan



I used a "Yukon Gear" posi ( same style as original with 2 piece case and 6 spiders ) and had to modify the case as you can see. I picked it up new for $450.00

 

[yellow wagon]

there are a lot of topics on this...search and read up....very good reading