I'm using Redline for all my gear oils in the Sporty. The stuff smelled a bit at first. that soon went away. only noticed quieter gear whine and a little bit easier to find gears when shifting in cold start ups.
I switched it over years ago when the Sporty was my dedicated off-road rig. now that my Freelander has a blown heater core ($$$) my Kia is back to being my daily driver. for the moment I'm treating her gently again. the extra protection of synth probably not needed now.

02 [color:"red"] Sportie [/color] 5sp 4x4 2dr. 1?" Body + 4" Rocksportgear lifts, 31x10.50 Wildcats M/Ts, Manual Hubs, Yakima rack, basket. Redline gear oils
http://www.cardomain.com/id/calapooyas
My beater, 03 Land Rover Freelander SE3