7.3 diesel with 355 gears
Has anyone had 355 gears with a 7.3 diesel was thinking about changing to them from 410's but want to know if it will be geared too low, also what rpm will 65mph, be at 410's at 1900 is about 56mph
Forum Discussion
djg wrote:
Grit dog it has an intercooler on it and that was what I was thinking about the gears going to 355's too much loss, I was also thinking about a tire change next time though as I only have 16's on it now but won't the increased tire height loose fuel milage I hear 1 MPG per 1" of lift can't say for sure though just what I have heard
Tire size = increase or decrease in mileage, like others said, there's a lot of variables there. Increasing rolling diameter in and of itself theoretically decreases rolling resistance, but increase in moment of interia by itself decreases efficiency.
for best mileage, keep highway tread on it. Going from a HT to a AT decreases mileage a bit and a MT a bit more.
But if your intended speed is not in the sweet spot for mileage, a tire diameter change could actually help you.
Throw ALL the variables in a blender, including weather, topography and your right foot and what comes out is.....
BTW 16s is your rim diameter and not indicative of tire diameter.
I didn't see where you mentioned if it's 2 or 4wd, but 4wd is a total non starter for gears IMO. That's putting 2 grand into an old truck for not "a lot" of gain.
Again, you could very well see some gains with higher gears like you're thinkin about but it might be a push. If your sweet spot for speed is 60 (assuming, since you didn't say) then dropping that much gear ratio will lower your rpms too much at that speed based on 2000rpms now and raise them too much if you shift out of OD.
JMO
Edit:Marcela said what I was trying to explain with the gear splits.
