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how do you make a rear end a posi rear end?
i have a rear end out of a 1985 olds cutlass and i dont exactly know what it is but it has 10 bolts ho9lding on the gears cover... i dont know if that matters tho.
but how would i go as makin it posi? i've heard of welding the spider gears but i dont see how that would make any sence
if any one has an easy way to do it or can show pics on how to weld it would be appreciated!

google up lincoln locker! I don't know much either but that's what it is known as hope that helps

if you were to do this I believe arc welding would be your best bet for strength of course using appropriate rod which you could ask a welding shop I m not really familiar with the different types or arc rod I know 6011 6013 7018 thats about the only arc rod I used anyway.

You could also get a mini spool.

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If you are planning to drive the car on the street I would highly advise against a lincoln locker or a spool of any kind for saftey reasons. My C-10 has a detroit locker in it and even that gets scary at times. I would suggest something like a limited slip in a 10 bolt. What are your expectations in the car?