Best gearing for 37's ? - Ford Powerstroke Diesel Forum
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Old 02-08-2010, 07:38 AM
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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 !

Last edited by Weathermanmc; 02-08-2010 at 01:47 PM.
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Old 02-08-2010, 01:37 PM
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Anybody ?????
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Old 02-08-2010, 01:40 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.
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Old 02-08-2010, 02:01 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.
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Old 02-08-2010, 02:09 PM
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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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Old 02-08-2010, 03:02 PM
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If you ever drop back down you will wish for 4.10s...........
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Old 02-09-2010, 12:00 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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Old 02-09-2010, 12:09 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
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Old 02-09-2010, 12:10 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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Old 02-09-2010, 01:17 PM
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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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