My transmission used to ran at or around 200 all the time (on or off road) I changed the fluid to Amsoil full synthetic ATF on the transmission and T-case and full synthetic gear lube also from Amsoil on both differentials and full synthetic motor oil from Amsoil, now my transmission is running about at or around 180 off road and about 175 on road at 70-75 mph and 85-90 degrees weather, I assume the oil is doing a better job of dissipating heat  This is my token on my H2.
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"2003 Sage green LUX, wrapped around brush guard with off road lamps, roof mounted SMA light bar, AirAid Jr. kit, Delphi Touchscreen Navigation Radio with a 6 CD changer and more! Also a member of the HOPE (Hummer Owners Prepared for Emergencies) pro
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