I remember reading an article online rebuilding the pontiac cone type posi. Anybody have any links about this? I read that the halves need to be machined to tighten up the slack caused by the cones wearing. At the same time ,machine off a few thousands from the end of the cone to allow it to slide deeper into the socket.
Mine is about down to a single wheel peel. i have to pull it out soon as i believe sombody didnt set it up correctly ;-) me.LOL It was running nice and quiet, until last week. I got on it hard a few times , then i noticed @ cruise it whines. So i'll need to pull the differential out and reshim. i figured while its out i can tighten it back up to a more solid posi.
If the cones and the taper in the case are severely scored and worn and shiny your pretty much out of luck and a new diff is needed. A true old school machinist should be able to fix these things but the cost may outshine a new diff.
Pontiac power to the front MF
The 2nd article is the attached PDF that I saved as a web page off the net some time back. It shows how the cones and carrier wear out. I don't quite agree with his strong opinion that all 64-70 BOP posis are junk, but it has good pictures.
Loc: Linthicum MD USA
If I didn't think that you would use extreme caution using this source, I wouldn't mention it.
YouTube has some incredible how-to videos. But you need to be [censored] careful when using such videos as guidance. All you have to do is find some type of repair you know about, take a look at some of the video advice, and you will see what I mean.
My 12 posi and rear springs will be the last of last, of planned repairs. It might happen next winter, but I have to get this last winter's project done.
My game plan is to hybreed the information sources. I'll start with tried and true, credible, hard copy technical publications, and I will combine it with videos, milking the cream from the crap. (Actually, I have seen some pretty badass dudes doing videos, and I would feel comfortable using them as an advisor.)
Loc: Cedar Rapids
I swaped my cone style to an Eaton unit. Really wasn't all that expensive past the initial purchase of the unit, but all my bearings and races were mostly new. Had a local shop do the work. The only issue with the Eaton is it only compatible in one series of gears. 3.36, 3.55, 3.90 and 4.33