Limited Slip??
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Elder User
Joined: Aug 2005
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From: Mesa, Arizona
Limited Slip??
I ordered my 2006 F250 4x4 with limited slip. What I want to educate myself on is what kind of limited slip does my truck have? a trac-loc, posi-traction, auburn ls, detroit truetrac or something else? and what is the differences between these different limited slips.
Postmaster
Joined: Jan 2005
Posts: 2,753
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From: Phenix City, AL
You'll have the Trac-Lok. It's a clutch based LSD. While it is better than an open diff, you'd be better to call it a "Limited Traction" than you would a limited slip. The problem is, if you aren't on a surface that gives both tires traction that is close to each other, the Trac-Lok will break away. It has a fairly low break away weight (meaning that the clutches can't maintain enough friction to keep traction).
Posi-traction is Limited Slip, it's just GM's name for from back in the 60's.
Auburn and Detroit's LS units are MUCH better.
Auburn uses a cone/spring engagement system that applies more force as more bias between the wheels is sensed. Meaning that if one wheel is slipping, the spring push harder on the cone clutches and apply more force to the spider gear, giving better traction. It is still a clutch setup, but MUCH better than the Trak-Lok.
Now, if you want a good LS (yes, it will cost more) get the Detroit True-Trac. No clutches, no cones, nothing to wear out. It's a gear driven setup and is ALWAYS engaged. It can be setup, prior to installation to suit your driving style, by setting the bias from left to right. It does not slip, and is as close to a locker as you can get, without the annoying clunking, locking, unlocking, and tire chirping that happens with a locker.
Hope that clarifies it a little for ya.
BFR
Posi-traction is Limited Slip, it's just GM's name for from back in the 60's.
Auburn and Detroit's LS units are MUCH better.
Auburn uses a cone/spring engagement system that applies more force as more bias between the wheels is sensed. Meaning that if one wheel is slipping, the spring push harder on the cone clutches and apply more force to the spider gear, giving better traction. It is still a clutch setup, but MUCH better than the Trak-Lok.
Now, if you want a good LS (yes, it will cost more) get the Detroit True-Trac. No clutches, no cones, nothing to wear out. It's a gear driven setup and is ALWAYS engaged. It can be setup, prior to installation to suit your driving style, by setting the bias from left to right. It does not slip, and is as close to a locker as you can get, without the annoying clunking, locking, unlocking, and tire chirping that happens with a locker.
Hope that clarifies it a little for ya.
BFR
