As Stu mentioned, a lot of people seem to neglect their power steering unit.
I've added an after market power steering cooling, and a tranny cooler in front of the radiator (I don't use the radiator to cool the tranny), and I've added a tranny cooler up under the bed of the Jeep, behind the rear axle, drivers side. This is a B&M cooler with a built in, thermostatically controlled fan.
The combo. of the two tranny coolers has worked very, very well for me for the past several years, out here in about as hot of conditions as one is going to find.
Virtually all of the off-road driving that I do is pretty heavy rock crawling.
Base - '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
Suspension- 4.0" Procomp Springs + 1 1/4" bl. Rear tri-link. Currie J arms, F&R. Warn hubs with WJ knuckles, custom cross over/hi-steering setup, Currie A/R Sway Bar.
HPD30/D44 (rear disk conversion, WJ dual piston caliber conversion in the front); Detroits; 4.56
Misc - Tera 2wd lo.
Tires - 35x12.50 MT/R's siped on 15x7 Champion Beadlocks.
Recovery - Warn XD9000i