i have a 2004 flatbed single cab, 4wd allison/dmax. its got 37,000 miles on it, just over the warranty. And i think i might need new injectors. I just changed all the filters, that didnt help my power, and it shifts into 5 gear religiously at 65 mph, all the shift points seem mildly late. Don't the allisons have adaptive shifting or something, it might shift like that due to a lack of engine power. i also own a 2005 duramax and the differences in power are night and day is the low power just a characteristic of the LB7s? i have my foot pretty much all the way to the floor most of the time just to make it go down the highway. and this is unloaded. In my LLY i can keep up with my buddys Camaro. Whats Wrong??