[DOUG213XRJ]

I bought a new 7.5/8 Auburn posi in 1999 for my 81 Malibu mild 355 ci rebuild and up graded 700R4 with 295/50/15 street radios. Ive all so put a used auburn from a 86 Z/28 in my 78 El camino 305 H/O th350 w/2000 stall 245/60/15 street radios, both toys do good burn outs and leave two to four feet of rubber when I bang second gear. Now Im not saying the 7.5, 7.625 or 7.5/8 is bullet proof fare from it but it can and will last with street tires, But you cant beat the snot out of it ether. Not trying to get in to a pissing match, just saying what I know from experience.

Doug

 

[big gear head]

Everybody has different experiences. My experience with the Auburn is like this. I installed 2 new Auburns with new gears and bearings and both of them came back in less that 9 months completely worn out. I had to scoop powdered metal out of the bottom of the housings and axle tubes and replace all of the bearings in both rear ends. I have removed a few used Auburns and also had to scoop out the metal in the housing and replace all bearings. I replaced a complete 8.5 in a SS Impala that broke an Auburn and punched 3 holes in the housing. When I still had my rear end shop my suppliers wouldn't sell me Auburns because they didn't like them either, not that I really wanted them anyway. If a customer requested an Auburn my suppliers would sell me an Eaton for the same price as an Auburn just to keep me from using them.

My experience with the Auburn is that they wear out MUCH quicker than the Eaton Posi, they fill the rear end with powdered metal and they can not be rebuilt. They also chatter a lot more than the Eaton Posi. After going through a few of them with my customers I stopped selling and installing them. It just wasn't worth the trouble to mess with them anymore. It's well worth the extra money for the Eaton Posi.

I know that many people have used them for years with no problems, but I'm not one of those people. If you treat them gentle they will do pretty good, but if you do a lot of burnouts or abuse them they will not last long.

 

[vettewine]

I installed a posi unit from Randy's Ring & Pinion that has worked beautifully for several years now. I wouldn't install a used posi from any other vehicle since you don't know how it's been treated and may end up costing you more in dollars and labor than a new one.