first off, what transmission do you have? if you have the allison 545, you very well can be getting the transmission hot on a hill. so it wont pull the next one as well.. my DTA360 with an AT545. doesnt do hills real well period.. I slow down in the hills.. and the slower you are, the lower the engine RPM which means you are not going to get quite as much boost from the turbo.. these engines max out on power in the 2300-2500 RPM range.. running them higher can help you with a running start. as the turbo is spooled up when you hit the hill...
if you heasr any exhaust type leaks.. (sounds like sssshhhh or air rushing) when you are on it hard that can indicate a manifold leak which would affect turbo performance..
I had an exhaust gasket leak on mine. which made a difference when i fixed it.. I would notice the sound change. as i drove it.. before I fixed it I sounded more like a semi truck with a definite whistle as the turbo spooled up..
I dont hear my turbo nearly as much any more.
-Christopher
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