Rear axle ratios
I've had a hard time finding a truck with everything I want on it, so I'm debating the need for higher rear axle ratios. Here are the net 1st gear ratios for various half-ton trucks: Make Rear ...
Forum Discussion
Thanks for the comments on tire diameter; I was naively just assuming stock tires were all more or less the same size. I wish I could post a table of some numbers, but since this forum screws up all the formatting and doesn't allow attachment of pictures I can't. I guess I have to get a web page someday to link to. But here are a few numbers, differences all relative to a 265/70-17 tire:
Ram -- standard 265/70-17 height 31.6, Big Horn 20" wheels 33.0, difference 4.4%. One reason I don't like the Big Horn package. With my first Ram the tow rating was reduced with the 20" wheels, but that doesn't appear to be the case now.
Ford -- standard size same as Ram, XLT 18" 32.1, difference of 1.5%. Sport 20" wheels 31.9 (1.0%).
Toyota -- standard 18" 32.1, TRD 18" same height although different size, Limited 20" 31.9.
Here are some rear end differences:
Ford 150, 3.31 to 3.55, 7.3%
Ford 150, 3.55 to 3.73, 5.1%
Ford 250, 3.73 to 4.30, 15.3%
Chev 1500, 3.08 to 3.42, 11.0%
Ram 1500, 3.55 to 3.92, 10.4%
Ram 2500, 3.73 to 4.10, 9.9%
Ram -- standard 265/70-17 height 31.6, Big Horn 20" wheels 33.0, difference 4.4%. One reason I don't like the Big Horn package. With my first Ram the tow rating was reduced with the 20" wheels, but that doesn't appear to be the case now.
Ford -- standard size same as Ram, XLT 18" 32.1, difference of 1.5%. Sport 20" wheels 31.9 (1.0%).
Toyota -- standard 18" 32.1, TRD 18" same height although different size, Limited 20" 31.9.
Here are some rear end differences:
Ford 150, 3.31 to 3.55, 7.3%
Ford 150, 3.55 to 3.73, 5.1%
Ford 250, 3.73 to 4.30, 15.3%
Chev 1500, 3.08 to 3.42, 11.0%
Ram 1500, 3.55 to 3.92, 10.4%
Ram 2500, 3.73 to 4.10, 9.9%
