Which limited slip????

[500Stroker]

I trashed my old tired original rear on Monday.  Pulled it out today and found it was a 489 with a cone unit so no rebuilding.  I heard to stay away from Auburn. So I'm looking at the Yukon YP PC8.75-SMTH unit (with 6 spider gears), or the True-Trac  TT913A572 units at Randy's.  Any experience with either?  I know to go with the crush sleeve eliminator.

http://www.ringpinion.com/PartsList.aspx?SearchMode=Diff&TypeID=2&Type=Chrysler&DiffID=8&DiffName=Chrysler+8.75+(89%2c41%2c42)&CatID=9&CatName=Positractions&CatType=Sub-Differential

[Moparal]

I myself would rather find an original used power lock and rebuild it myself. Vendors seem to like to suck the life out of us with the costs of sure grips.  The only real reason it is all high is greed.   Just my opinion though

[72bluNblu]

 

I just bought a complete 742 3rd member with the Dana clutch type Sure grip for under 400 bucks shipped off of eBay. Even if I rebuild it the cost will only be a little more for the entire 3rd member as it would have been to buy just a new clutch type Sure Grip unit from Mancini racing. I suppose that if I had a 742 or 489 3rd member I might have just bought the Sure Grip unit, but I had a 741 and wanted to upgrade that as well. Sure Grip units seem to be on eBay all the time and I'm sure you could find one locally with enough time/patience.

[Chryco Psycho]

true tracks are a great design but force you to use the green axle brgs

[500Stroker]

Already running green axle bearings so that is not a problem.

[73EStroker]

True Tracs are pretty hard to break (not impossible though) and last forever.  They are a gear limited slip not clutch.

[duodec]

true tracks are a great design but force you to use the green axle brgs

Chryco,
     Mopar Action August 2008 issue had a blip about setting up a Torsen style True-trac with tapered roller bearings.  The article makes it sound like details were in previous issues (which I don't have) and involved purchasing custom axles.  There were no details in the issue I have other than that.  Its in the "Past Tense" sidebar to the 8-3/4" build article, page 69

     Perhaps worthy of further study.  Although I have both an excellent clutch type and a brand new cone type available, I've been wanting a Torsen since I first saw them at a SEMA show back in the '80s.

[Chryco Psycho]

Well Duh ... I quit buying MA abut a year ago so I don`t have it either , I got fed up starting an article at the front of the mag & having to dig in the back to finish the article & then dig at the front to find the next article I wanted to read
 if you find something out about it let us all know or if someone has the previous issue & can enlighten us that would be awesome too
 I have loved the torsen design since I first saw it back in the 80s also , it just makes sense to me

[Changin Gears]

It seems like a pretty good idea.  They had custom axles made longer (I think it was 3/4" each) so they would touch each other in the center of the diff.  This allowed the tappered bearings to be adjusted against each other.  Would also work with a spool.

[Mt.St.BigBlock]

Hi, After reading that article, I was thinking about E-body axles in a b- body housing, True-trac and
the original style tapered roller bearings. Think it would work and be cheaper then custom axles! Any
thoughts??  Jeff

[Changin Gears]

It sounds like a great idea, except I don't think the splines are long enough to engage into the true-trac.  They might partially engage, but most will be in the center just along for the ride.

[72bluNblu]

A decent axle shop might be able to extend the splines, although it may no longer be cheaper than custom axles...

[Mt.St.BigBlock]

It sounds like a great idea, except I don't think the splines are long enough to engage into the true-trac.  They might partially engage, but most will be in the center just along for the ride.

Yes, good point, I'd have to check that. With only three quarters of an inch on each side I was thinking there
was more than enough spline length to cover that but will have to look closer with the stuff in front of me. Jeff

A decent axle shop might be able to extend the splines, although it may no longer be cheaper than custom axles...

I agree, on both counts. Don't know how far in from the spline end the heat treating goes. Jeff

[ViperMan]

Hi,

What opinions do you guys have on the detroit locker - DET187S-14A - from the same link above?  And just out of curiosity, what are known issues with the Auburn units?

Thanks.

Jeff

[Chryco Psycho]

Auburns are cone style , limited life & not rebuildable