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COSkibum00 02-22-2005, 10:01 PM You boys are full of good info. Unfortunately i have yet to find a solid number. What is a "solid" number HP-wise for a stock auto or a stock 6 speed? Trying to decide which to go with. Thanks boys ... i'll have you Colorado guys over for a beer when i get my truck just to piss of the neighbors... and the old lady. :grd: GMC-2002-Dmax 02-22-2005, 10:25 PM IIRC once you cross 330 HP at the rear wheels or 700 lLBS/TQ............start looking for upgrades............ I beleive that a dual mass flywheel will help you hold on the 6 speed and there are 3 or 4 options on the ALLISON........ Check out the ZF 6 Speed forum and ask there ........... T:cool: NY Deadeye 03-02-2005, 02:42 PM I got to 335 rwhp and over 700 tq fine. when I went to level 5 HJAT on the dyno it smoked the clutch ! | ||