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sideswiper 02-14-2005, 01:40 PM i have a 2005 dually that works very well except that the turbo boost seems to vary alot.when empty their are no problems but when i have a heavy trailer behind it the turbo boost will only get to about 18lbs in 5th gear but in 4th it will go to 30.whats up with this? Max Power 02-14-2005, 01:42 PM We do know that the engine is limited to 520lbs torque in 1st and 5th perhaps this is how they limit it. I am not really sure. McRat 02-14-2005, 01:43 PM While I do not have a boost gauge, I can guess that it is part of the detuning that LLY's have built into the ECM. On LLY's 1st and 5th gear are 300HP/520TQ according to GM. Only 2,3,4 are 310HP/605?TQ. lbz492 02-14-2005, 02:59 PM i think that is the stupidest thing. gm should just upgrade the trans alittle bit to hold the extra power. | ||