most common rear end gears

import600 · Post by **import600** » Sat Jun 23, 2007 1:36 am

Hey, my truck has 3.70 gears. is that a common gear? Gas milege is a little low with that gear right? but its got some extra torque too? just curious.
thanks

Wes · Post by **Wes** » Sat Jun 23, 2007 3:02 am

Is a good compromise gear, seems our bump mostly came w/ 3.5x, 3.7x, 4.10 or 4.56. 4x4 and maybe dually 350's for the 4.56s.

kid · Post by **kid** » Sun Jun 24, 2007 9:26 pm

F100s came with 3.25s to 4.10
F250s came with 3.32s up to 4.10s
F350s came with 3.58s up to 5.10s

67heavystepside · Post by **67heavystepside** » Mon Jun 25, 2007 12:35 pm

MY 67 F250 2WD HAS A DANA 60 WITH 456

Wes · Post by **Wes** » Mon Jun 25, 2007 12:52 pm

My 67 F250 4x4 has d60 w/ 4.56 matches tag on door too.

averagef250 · Post by **averagef250** » Mon Jun 25, 2007 9:11 pm

Haven't found a 2wd with 4.56's, but they were pretty common in the 250 4x4's. I'd say 2 out of 5 that I've owned have had 4.56's

67heavystepside · Post by **67heavystepside** » Tue Jun 26, 2007 5:09 am

maybe mine has 456 is because my truck is a 3spd with a 240 six cyl

averagef250 · Post by **averagef250** » Tue Jun 26, 2007 12:06 pm

The six trucks were the most RPM limited and typically had middle of the road gears. The 240 has plenty of low end grunt to start out with 3.25 or 3.50 gears.

kid · Post by **kid** » Tue Jun 26, 2007 12:32 pm

My Dad's 240 had 3.50s

roachrider · Post by **roachrider** » Wed Jun 27, 2007 12:05 am

My '67 F-250 Highboy has 4.56s as well.

spartman · Post by **spartman** » Wed Jun 27, 2007 9:01 am

My 67 F-100 with the 240 six came with the 3 speed and 3.70 gears

mrsnicks · Post by **mrsnicks** » Wed Jun 27, 2007 9:05 am

So I guess my truck was re-geared? It's got 2.75 gears in it.

It's been awhile since i looked it up, but i think those are good for highway speeds....

Patrick

mjhaltom · Post by **mjhaltom** » Wed Jun 27, 2007 2:49 pm

spartman wrote:My 67 F-100 with the 240 six came with the 3 speed and 3.70 gears

Mine too.

19674x4 · Post by **19674x4** » Wed Jun 27, 2007 5:58 pm

67 f-250 highboy came with 4.56's now has 4.10's and maybe eventually 3.73's

QC · Post by QC » Wed Jun 27, 2007 6:14 pm

The 71 I used to have had a 3.0, by the VIN data it looks like 71 was the only year it was available. It had a 360 and still only got 12 mpg on a good day.
My 69 302 has a 3.50.

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most common rear end gears

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