7.3L to 6.7L comparison
I replaced my '99 7.3L with a '15 6.7L recently. The two trucks are as identical as you can make from the order book: Supercab F350 dually 2WD Lariat 3.73 gears. For several years I have made the driv...
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It was the 4R100, yeah 4 speeds not 5 (how soon I forget...). BIG gap between 3 and 4. It would bog down on the grades, then downshift. If I downshifted manually or with a heavy foot before it bogged, now it's turning 2700 rpm and giving me a headache. The gap was big enough one day heading north on US101 against about 40 knot headwind, I had to drive for several hours in 3rd.
In contrast the 6.7L has 6 speeds, and very nicely spaced. It is also much quieter and smoother, revving it to 2700 doesn't feel stressful at all - but it has so much torque this is seldom necessary.
Cleaner - it doesn't smell like a diesel running. You can wipe your finger inside the exhaust tip and it will be perfectly clean, no soot at all. The cost for that is an enormous amount of smog equipment which I am told is expensive to fix should it need to be.
In contrast the 6.7L has 6 speeds, and very nicely spaced. It is also much quieter and smoother, revving it to 2700 doesn't feel stressful at all - but it has so much torque this is seldom necessary.
Cleaner - it doesn't smell like a diesel running. You can wipe your finger inside the exhaust tip and it will be perfectly clean, no soot at all. The cost for that is an enormous amount of smog equipment which I am told is expensive to fix should it need to be.
