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Good point, I run the Power Service cetane additive-white bottle, and my truck runs much better on it.

I would have to agree with 11Echo, The 4.3 would be my choice also. Aside from the crankshaft, it shares almost all the internal parts with the 5.7-350. As far as power goes, they can be built to a 300HP carburated roller engine. With the 4.56 gear ratio,even a stock 4.3 has more HP than the J...

You should be getting far better fuel mileage with the 700-R4 as the engine runs at a lower RPM in 4th and in lockup which is really a 5th gear ratio. Im getting almost 25 mpg with the 700-R4 and 285 R16 tires. Exactly what stock size tires are you running? You may need taller tires. Downstate...