i thought they had a locking rear diff stock? or is that something different? i don't know cars well. bikes yes, cars no...
this is something i can comment on. i know blazers very well... first off the "posi" isnt a posi, its a cam locked locking diff. it has a toothed ring on the diff, and if the speed of one wheel exceeds the other some weights fly out which allow a small cam to engage the ring on the diff. think of a flywheel and all of its teeth, then a screwdriver jamming itself into the ring gears teeth. same theory.
they are pretty decent, but you can blow them up quickly if one wheel spins Very fast before the other has a chance to lock in. boom...
to see if you have this option, look in your glove box at the white sticker with allof the codes. look for G80. thats the "posi" code. you can tell the gearing you have by looking for gu4 - 3.08, gu5 - 3.23, gu6 - 3.42 (most common), gt4 - 3.73(common), gt5 - 4.10(few v6, most 4 cyl)
i use this one when looking up gm codes. you learn stuff about your truck...
http://www.gm-trucks.com/rpo-code-lookup/
hope this helps,
peace,
evan....
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