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Message:: [QUOTE="Guntoter, post: 7061987, member: 83063"]I can't find any info from any real source, I know... I know... 2050 pounds of torque, bla bla bla... I hear trucker stories about blowing up transmissions but right now I'm at 2800 pounds of torque (725 HP) to the ground and haven't had any issues with heat or anything else. Im at about 50K miles on the motor so far and ready to bump up my tune (still running the "break-in" tune). My question is, does anyone have experience with 3200 pounds and 900 HP using a stock transmission and rears? If so, were there any issues and what gear oil do you run, how often do you change it, do you run any coolers etc? BTW, Im in Phoenix AZ (hottest place on earth and we're in a valley so everything is up hill). BTW, I was told by a guy who has built dozens of 13/18 speeds that the guts are mostly the same (with a few minor exceptions) in 13 and 18 speeds. He said the 18 speed is not really any stronger than a 13 in high range. Is that true?[/QUOTE]