School me! need new gears with 37's? - Ford Powerstroke Diesel Forum
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post #1 of 27 Old 06-14-2012, 12:02 PM Thread Starter
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School me! need new gears with 37's?

ok enlighten me please. I tried to search but not sure what to search for. if you can answer or direct me to a thread that has already answered.

I am putting 6 inch and 37's on my 2012 F250 short. Do I need to change gearing?
I will tow a boat and a camper. I also daily drive the truck.

along with that. please tell me what the different gearing numbers reference.
thanks.

2012 F250 4x4

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post #2 of 27 Old 06-14-2012, 12:17 PM
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what is your current gear ratio?
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post #3 of 27 Old 06-14-2012, 01:07 PM
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If you have 3:55 then you should be fine.

2012 F-350 CCSB 4X4, plow package, Skyjacker 1" leveling kit, 295/70/18 Nitto's
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post #4 of 27 Old 06-14-2012, 01:13 PM
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I have the 3.55 gears and 37's. I tow an 11k lb trailer with no issues. I am normally turning around 1600 RPM at 80 w/ no load. (note....the speedo says ~73 when I am doing 80).

2015 Platinum F250. 6.7L 6 inch Fabtech Coilover 4 link w/ rear traction bar. 37x13.50R22 Toyo MT's on Fuel Lethal's, Royalty Core Grill, Dual mini DS 2.0 Morimoto projectors
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post #5 of 27 Old 06-14-2012, 03:16 PM Thread Starter
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yes, I have 3.55.

are you able to re calibrate the speedometer, or does changing the gears fix the speedo?

2012 F250 4x4

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post #6 of 27 Old 06-14-2012, 05:28 PM
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Quote:
Originally Posted by buschy View Post
yes, I have 3.55.

are you able to re calibrate the speedometer, or does changing the gears fix the speedo?
No on both accounts

Matt
2011 F350 6.7L CC/LB SRW 4x4 King Ranch White Tri Coat
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post #7 of 27 Old 06-15-2012, 01:08 PM Thread Starter
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so no way to fix the speedo? that sucks. and the general consensus is that 37 will be fine with 3.55 gears?

2012 F250 4x4

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post #8 of 27 Old 06-15-2012, 05:02 PM
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If you were running 20" rims from the factory then that is tallest the computer will accept. Mine came with 18's, so when I bumped up to 295's, I had the dealer set the truck for 20" wheels and 275/70/20's and now I am only .5 mph off.

2012 F-350 CCSB 4X4, plow package, Skyjacker 1" leveling kit, 295/70/18 Nitto's
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post #9 of 27 Old 06-15-2012, 05:29 PM
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I think the max they can set the tire for in the software is 34"

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post #10 of 27 Old 06-15-2012, 05:30 PM Thread Starter
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Quote:
Originally Posted by TrickTruck View Post
I think the max they can set the tire for in the software is 34"
none of the tuners or any other way to do it?

2012 F250 4x4

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