Re: Best Limited Slip Diff for Mild Off Road?
The Dana 44 option in the TJs includes a Trac-Lok limited slip. My '98 TJ has a Trac-Lok in the D35c as a factory option (really wish I had the D44 too). The Trac-Lok uses a different carrier than the open differential. Your friend might be able to pick up a used Trac-Lok cheap from someone who has upgraded.
My Trac-Lok is holding up well at 30k miles, has always seemed more aggressive than I expected of a limited slip (I've lived with a No-Spin in a '59 F250). It does well off-road, and the only time that it's apparent on-road is if I'm applying too much power while turning. I know that someday the clutches will wear out. I haven't decided yet whether I will then replace the clutches, replace the diff with a LockRight or TrueTrac, or just go to a D44 and LockRight or TrueTrac. The behavior of the Jeep on slick pavement is more important to me than behavior off-road. I can always winch out if I have trouble off-road. Problems on-road in traffic generally result in severe damage (especially when the roads are ice-covered).