Trac-loc

[Prerunbronc]

How long will a factory 31 spline trac-loc last or is it not worth using and buying a Detroit. It is a 9" runing 4.56 r&p with 35" tires it see's alot of dirt

[philofab]

How long will a factory 31 spline trac-loc last or is it not worth using and buying a Detroit. It is a 9" runing 4.56 r&p with 35" tires it see's alot of dirt

They usually last anywhere from 50K to 150K before needing a rebuild. I normally add a steel and a friction when rebuilding them.

[Prerunbronc]

Nevermind I took the rearend apart the trac-loc is broken

[philofab]

Nevermind I took the rearend apart the trac-loc is broken

Did it crack around the ring gear bolts? Like on the bottom of this page:

http://www.kevinstang.com/Ninecase.htm

[Prerunbronc]

Yea

[baja-chris]

aka Slop-Loc.

I gave up on them after seeing them totally worn out in 10k on a new car. Dealer said factory spec is that if it holds 20 ft-lbs then it's ok. 20 ft-lbs??? Good grief, that does not provide any traction assist at all.

I put an Eaton posi in my cobra and it's still working sweet after years of hard use. Much better than the Auburn I tried. The Ford Trac-Loc is worthless IMHO.

Now for the dirt there is no substitute for 100% lockup. I run a spool in the bronco. Tire chirp be damned.

A pair of Detrot Lockers in the crewcab keep it moving. BTW, I have 250,000 miles on my Detroit Lockers in the crewcab, front and rear. Still work just a good as the new. Had one in the bronco and hated it due to the short wheelbase. Spool much nicer on the street in the bronco. Your mileage will vary.

[Polarcub]

I have a detroit in the 8.8 in the dirt great but kind of odd on the street. When I do the 9" its going to a spool tires already take a beating on the street with the detroit other than that and a chirp or two very tolerable.