Where are you getting your Tach signal from? And are you 100% sure your RPM's are correct
And What kind of Tach are you running

Not sure if they are 100 Percent. Running an Auto Meter tach that runs off a signal from the alternator. But I do know that im not going fast enough I cant even think about running down the freeway.

What Model Auto Meter and how did you Adjust it

If your tacho is correct about the only other area to look at would be your transfer case,
Not knowing what you have it is only a guess but is there any chance this has been fitted with crawler gears?

Sport Comp Silver Diesel Tach, it Straps to the alternator. I used a digital hand held tachometer and some reflective tape on the crank to adjust it. The transfer case is a full time NP203.

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I don't believe so it came out of a stock 73 Ford. Im not sure what the T-case ratio is but Ill look at that ASAP. Im thinking about swapping an NP205 Anyway.

I don't think it's a engine problem, your truck should be in the 110mph range at 3k--3:54-- and 5spd, according to tire size.

your EGT's should be getting up around 1,000* or higher, if they are not I feel like the clutch is slipping and not loading the engine.

Thanks for the advice, im gonna put a new slave cylinder on and bleed the line out and see what happens. The Slave just doesn't seem to be putting enough pressure down.