I'd had a couple of GM diesels over time and the other thing to consider is the gearing of the box and axles need to be in line with the torque/power band of the GM 6.2 diesel. If your conversion project didn't take this into account, I am not surprised you are disappointed.
My '83 4x4 Blazer with 6.2 had a 3spd auto and 3.73 gears in it. Once in the power band, it did pull like a train, but wasn't a 0-60 terror. Then again, what trucks are?
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'95 RRC LWB, '05 Suburban Z71 (not stock), '94 F350 (very ugly), '62 International 404 tractor (red & white) & many other project cars in the past!
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