Yeah I've seen this before. It cost me $70 and didn't change anything. My problem was O2 sensors. Are you getting the P0300 code? If so I would suggest replacing your upstream O2 sensors. Use NTK sensors only.
What do you have in yours? IIRC you have an atlas transfer case and with the SFA what do you use for a front driveshaft? I'm kinda curious because one of these years I want to put a SFA in mine.
It could be the parking brakes binding up, or something wrong in the diff, or possibly the transfer case. My money is on the parking brakes, but it's possible that whoever was messing around in the diff messed something else up. If it were me, to start troubleshooting I would jack the rear end...
Pull the carpet back under the driver seat and look for the weld seam. Follow that seam up toward the firewall and you'll see a plug. Pop a screwdriver through it and pop it out. It usually is partially covered with a caulk type sealant.
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