Difference between 4.30 & 3.55 gears
My 2011 F-350 has a 3.55 geared rear end. The new 2017 F-450 only comes with a 4.30 geared rear end. Basically the same engine (6.7 turbo diesel). Does that mean better or worse fuel consumption...
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I'm fairly sure the transmission ratios have not changed in the 6R140 from 2011 to 2017.
It is quite possible that the F450 will have shorter diameter tires on it than an F250/350SRW with 18" or 20" wheels. Anyhow, the difference in diameter is not likely to be more than 2 inches.
It is quite possible that the F450 will have shorter diameter tires on it than an F250/350SRW with 18" or 20" wheels. Anyhow, the difference in diameter is not likely to be more than 2 inches.
