Here's what I would like to see in an KJ FAQ sticky thread. These questions are asked about once every other week.
What is the difference between lowered and prelowered?
What lifts are available for the KJ?
What is the largest tire size that will fit without rubbing (with and without a lift)?
What changes have occurred between the 2002 and (present year model) KJs?
On my 2002 I have the rocky road OTT lift and I put 255/70/16 Revo's on it and they rub like crazy. I had to cut out some fender and smash back the pinch seam.
I just ordered the Rockfather II Kit and will have it put on next week, let's see if this helps.
almost a year later.....lol....try the lostkjs.com site for a great bunch of liberty owners, friendly folks (yes, i'm a member), and very willing to help, advise, and lend a hand when able. i would say that nearly any question a KJ owner, or perspective KJ owner might have could be answered on that site.
87 YJ my trail beater 31" MTs
05 KJ my daily driver lifted with MT/Rs
Trac Lok is a multiplate clutch type limited slip differential made by the Dana corporation, which is installed in various Dana built Jeep rear differentials.
An open differential (most common type in use) allows a difference in wheel speed between rear wheels (as well as front wheels on a 4wd while 4wd is in use), which is needed to allow the vehicle to corner normally.
However, an open differential can allow the wheel with the least traction to spin, while the wheel with the most traction doesn't get enough torque to propel the vehicle. The most extreme example of this is with one wheel in the air. The wheel in the air will spin, while the one on the ground will be stationary.
The clutch plates in a limited slip differential are packed loose enough to allow a difference in wheel speed when needed (although there will still be some friction). But when there is enough difference in wheel speed, the clutch plates are pressed together tighter, increasing friction, which fights the difference in wheel speed. This allows a certain amount of torque to be transferred to the wheel with traction, which propels the vehicle forward.
There are problems with a clutch type limited slip. One, the clutches can be overcome with too much torque, allowing them to slip, which limites torque transfer. Two, the clutches can overheat, which reduces their effectiveness (until they cool). Three, they will eventually wear out, which reduces their effectiveness permanantly (until they are replaced).
I'm not sure if your KJ would have a Dana Trac Lok. It has a Chrysler 8 1/4" rear differential instead of a Dana differential.
If it has a limited slip differential but doesn't have Trac Lok, it would have Chryslers' brand of limited slip differential (which would be very similar in design). I'm also not sure how to tell on a KJ if it has a limited slip or not, other than actually driving it and experimenting with it to see if it has one. This is where the Jeep experts need to speak up.
'06 Toyota Tacoma TRD Double cab with selectable rear locker ('06 Wrangler replacement).
'08 Yamaha FJR1300 sport/touring motorcycle with ABS and power adjustable windshield.
'06 Yamaha Wolverine 450 sport/4wd ATV.
'09 Yamaha Grizzly 550 SE with EPS, winch.