Best gearing for 37's ? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 02-08-2010, 08:38 AM Thread Starter
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Best gearing for 37's ?

Just as the title says whats the best gearing? Stock I have 3.73 gears so I am thinking either 4.30 or maybe 4.56. Once i get my 35's wore out I am going to go with 37s. I know what the calculator says on ring and pinion.com but I wanted to get some feed back from guys that have re geared and are running 37 inch tires.

Thanks !


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2004 F-250 lariat 4x4

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Yukon 4.56 gears with Lockright Locker in the front

Last edited by Weathermanmc; 02-08-2010 at 02:47 PM.
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post #2 of 11 Old 02-08-2010, 02:37 PM Thread Starter
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Anybody ?????


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Michael
2004 F-250 lariat 4x4

SCT, Innovative tunes!
AFE intake, Banks 4" turbo back
Fass fuel system,
RCD EGR delete
ELC coolant
High idle, Fog, Zoodad mod
Modified Fuel Banjo Bolts,
Boost, EGT, Trans Temp, gauges
2" front leveling kit
3" blocks that replaced stock in the back
Firestone airbags with on board compressor
Bushwacker cut out Flares,16.5x9.75 wheels, with 37/12.50-16.5 Goodyear Wrangler MT's
Yukon 4.56 gears with Lockright Locker in the front
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post #3 of 11 Old 02-08-2010, 02:40 PM
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I am running 3.73s and I am happy. Just gotta calibrate your Speedo and it will compinsate on shifting.

2002 f250 BFT Edition
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post #4 of 11 Old 02-08-2010, 03:01 PM
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It all depends on what you're going to use your truck for. I you dont tow I would go with the 4:30's, but it you tow any heavy loads I would go with the 4.56's.

2003 F350 C/C LB FX4 6.0L, 4wd, 8" lift on 37" Xterrains, 4.56 gears, Mag CAI, zoodad mod, high idle mod, Sirius radio, 4" straight pipe to 5" dumping out in front of rear tire

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post #5 of 11 Old 02-08-2010, 03:09 PM Thread Starter
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I do plan to tow so I guess I would rather have the truck set up to do the hardest work best ! I just don't want to get 4.30s and then always wish I had gotten 4.56. So this is just to see what the people that have done it would suggest. Thanks.


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Michael
2004 F-250 lariat 4x4

SCT, Innovative tunes!
AFE intake, Banks 4" turbo back
Fass fuel system,
RCD EGR delete
ELC coolant
High idle, Fog, Zoodad mod
Modified Fuel Banjo Bolts,
Boost, EGT, Trans Temp, gauges
2" front leveling kit
3" blocks that replaced stock in the back
Firestone airbags with on board compressor
Bushwacker cut out Flares,16.5x9.75 wheels, with 37/12.50-16.5 Goodyear Wrangler MT's
Yukon 4.56 gears with Lockright Locker in the front
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post #6 of 11 Old 02-08-2010, 04:02 PM
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post #7 of 11 Old 02-09-2010, 01:00 PM
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I've always used a graph similar to this to choose gear ratios but here it seems everyone says to go with a lower number, why is that?
4Lo.com :: Gear Ratio & Tire Size Chart

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post #8 of 11 Old 02-09-2010, 01:09 PM
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i would do 4.30's anything higher and you will suffer on the highway!

80 is a stretch is much taller gearing

1996 f350- 615hp/1258tq uncorrected

2008 KR f350- leveled and tuned 569hp/1158tq

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post #9 of 11 Old 02-09-2010, 01:10 PM
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I have 38's and 3.73 right now. by summer plan to swap out to 4.56's Did the math looked at charts and talked to a few different shops and i could go up to 4.88. But 4.88's seem a little steap? I'd stick to the 4.30 or 4.56
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post #10 of 11 Old 02-09-2010, 02:17 PM Thread Starter
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I have about decided to go with 4.56's. I read somewhere that 4.30 gears would make the motor run pretty close to stock rpm's so 4.56's with 37 in. tires would be about the same as having 4.10's rather than 3.73's with stock tires. I load my truck down pretty regularly so I think 4.56's will make everything go a little easier.


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Michael
2004 F-250 lariat 4x4

SCT, Innovative tunes!
AFE intake, Banks 4" turbo back
Fass fuel system,
RCD EGR delete
ELC coolant
High idle, Fog, Zoodad mod
Modified Fuel Banjo Bolts,
Boost, EGT, Trans Temp, gauges
2" front leveling kit
3" blocks that replaced stock in the back
Firestone airbags with on board compressor
Bushwacker cut out Flares,16.5x9.75 wheels, with 37/12.50-16.5 Goodyear Wrangler MT's
Yukon 4.56 gears with Lockright Locker in the front
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