05 lly powerloss

[05dmaxlly]

hey i have a 2005 lly and it doesnt seam to have the power like all my frends trucks got. for example if they put it to the floor it wil chirp 2nd...mine doesnt come close.im not sure why i have changed the fuel filter and didnt help.maybe it could be an injector or could it be because i have 265 tires instead of stock. any ideas would be helpfull.

[More Power]

The adaptive learn of the Allison can produce changes in shift quality depending on how the truck is driven. For example, it'll shift firmer after towing for a time, and it'll shift softer after having been driven easy for a time.

Do you have gauges? Boost pressure and EGT can help you diagnose a truck that's down on power. Yours may not be, but without more performance data (0-60's, dyno, etc.) it's hard to know.

Jim