73-87 Chevy _ GMC Trucks > Rear Drivelines, Drive Axles and Gearing

Posi rear end question?

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MEXICANKAMIKAZE:
So I have a 79 c20 and I was wondering what do I need to do to make my rear end posi? Any info on this subject would be appreciated.

SkinnyG:
The "easiest" is a "lunchbox locker."  These can replace the internal guts of your open differential, and can be done by anyone with reasonable mechanical skills.  I have not heard a lot of positive about them, but I have not run one.

Any other type of posi requires removing the differential carrier, swapping the ring gear, and then re-setting the back lash.  This is a bit more advanced, but with a cheap dial indicator and (potentially) some extra shims, it can be done.

If you are changing the ring and pinion as well, you either need to be very disciplined and patient and have some special tools (including a hydraulic press) to setup the gears with the proper pinion depth, pre-load, and backlash.  I seriously would not recommend this to most people.

If your axle needs a full rebuild (it ~is~ over 30 years old, eh?!), you may want to consider farming the whole thing out anyway.

Greybeard:
If you are really wild and don't care about your tires you can add a Lincoln locker. To do this you remove the cover, wash the gear oil out really good, fire up your Lincoln tombstone style arc welder and start welding the spider gears together, clean the rear end out really good again and fill with gear oil. Now you have a locked read end.

But you asked about a posi different animal altogether. There's no actual 'posi' anyway, it is a brand name used by GM long ago, limited slips just got that name over time. A limited slip can come in many different configurations from what is called a mechanical locker to a clutch activated one. Most of these need the entire rearend disassembled to install. However, there are some that just replace the guts as as SkinnyG said. these would include the Powertrax, EZ locker, and a few others. You'll have to check them all out to see which one is easiest to install.

rich weyand:
http://www.ebay.com/sch/i.html?poi=&adpos=1s2&ul_noapp=true&geo_id=10232&MT_ID=69&crlp=78261710883_867&keyword=12-bolt+posi&rlsatarget=kwd-4132944982&_nkw=12-bolt+posi&device=c&crdt=0&treatment_id=7&clk_rvr_id=968466216657

Greybeard:
Yup ^^^

And after looking down the line this popped out >>

http://www.ebay.com/itm/GM-Chevy-12-Bolt-Yukon-Spartan-Locker-30-Spline-SL-GM12-30-Posi-Locker-NEW-/371512400029?hash=item567fdd589d:g:pKsAAOSwBLlVQu3m&vxp=mtr

It would be the easiest to install since the carrier does not have to be removed. Just pull the axles, remove the retention bolt for the cross shaft push the cross shaft out enough to remove the guts of the carrier, transfer what is necessary onto the new locker push it into the carrier, push the cross shaft in, replace the retainer bolt, push the axles back in, put the cover on and fill with oil. Sounds simple right?

http://www.ringpinion.com/b2c/PartCats.aspx?SearchMode=SubCat&ParentID=11

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