need to go pick one of these up, then you may be able to isolate what actually is getting hot http://www.harborfreight.com/catalogsearch/result?q=thermometer
I'm pretty sure that the system has been checked out by the Toyota mechanic that's going on the trip with us using one of those. Nothing obvious was identified.
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1989 4Runner: Dual Ultimate (Inchworm front & Marlin 4.70 rear), Marlin Twin Stick, 1200-lb clutch, 4.88 R&P, Aussie Front, Detroit rear, 30-spline Longs, Long hub gears, ARP hub and knuckle studs & 35x12.50 Cooper STT PRO tires. Marlin rear bumper & sliders. FROR front bumper. SAS with Alcan springs & Rancho 9000XL shocks. Budbuilt Bolt-on traction bar. Custom Interior Cage by Those Guys Rod and Customs.
Moab Tested & Rubicon Approved