Once you get the Moruzzi engine in...sell the TH400 and I'll build you a 4L80 the same length as the TH400 so you won't have to change anything. having the 4th gear is a game changer if you do any type of street driving.
Gregg, put a new rail pressure sensor in (GM one). Then a lift pump might be what you need. Right now your CP3 (high pressure fuel pump) is acting as the lift pump and as a high pressure pump. CP3's are expensive and a pin to change on that truck. Simple things first.
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