40’s without gears
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40’s without gears
Please don’t jump all over me if this seems like a stupid question. I someone told me that the newer f250’s with the 6.7 have a lower trans gears and rear end than the 6.0 did. He told me that the new diesel would turn 40’s without gears just as good as my 6.0 turned 37’s without gears. Can anyone confirm or deny this? I would love to do 40’s and wouldn’t be towing more that 5k lbs, but it does seems like it would be foolish with out gears (which I do not want to do). Thanks.
Laughing Gas
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From: prince george, bc canada
Your friend is wrong about gears. Almost all 6.0s came with 373s. These new 6.7s offer a 3.31ish, 3.5 and the 373 cogs. Its the 900ft lbs of torque that lets the new 6.7 pull these big tires. Lower gears of course work better but with the 373 you could pull it off. Fords 4.30 option can be had as well
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A stock 6.0 with 3.73s and 37s was able to put out a little over 4200 lbs of tractive force at the ground in first gear. A stock 2017 6.7 on 40s would be able to put out over 7200 lbs so much better get up and go. These numbers assume the torque converters putting out 1:1 which they wouldn't be but you get the idea.
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Sounds like I need to just go with 37’s.
I was going to do a 10” lift to make the 40’s fit.
Also, my axle code is 3J. Which from what I can tell that’s a 3.55 from the older models. I could not find much on the 2017 model axle codes.
I was going to do a 10” lift to make the 40’s fit.
Also, my axle code is 3J. Which from what I can tell that’s a 3.55 from the older models. I could not find much on the 2017 model axle codes.
Last edited by Maverick250; Sep 22, 2017 at 05:16 AM. Reason: Add question
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