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post #1 of 14 Old 08-01-2012, 07:02 AM Thread Starter
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Gears???

Im trying to figure out what set of gears to run in my truck. I currently have 3.73s but I'm running 385/70/16. Looking at the gear ratio charts its saying to run anywhere from 4.88 to 5.29s for an everyday driver. Has anyone done this on their truck and what is the fuel mileage and performance difference?

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post #2 of 14 Old 08-01-2012, 07:31 AM
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Sounds very low for a set of 37"s, unless my math is off.

4.30s or 4.55 would be close to stock for the setup. Most of fellas I've seen running 37"s run the 4.30s unless they find themselves towing alot.

I unfortunately do not have the mileage and performance numbers you are looking for, but someone should be able to chime in.
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post #3 of 14 Old 08-01-2012, 08:46 AM
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4.88 and 5.29 are WAY too low for these vehicles with only 37's. I run 5.29's in my wheeler with 37's and i can burn rubber on pavement with a stock yota v6 and its only producing half if not less the amount of power your diesel is making.

I say a 4.10 or 4.30 set would be fine. Personally i wouldnt go any lower than 4.10. Might be slugish off the line but will pick up pretty quick.

I have 33's with 4.10's and i start in 2nd gear unless im on a hill or have a load behind me. Kinda slow on starts but once the RPM's start to climb it just goes and goes.
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post #4 of 14 Old 08-01-2012, 09:03 AM
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I would go with the 4:10 or 4:30. I have 35's with 3:73 and do alot of towing with it. It takes a little more to get going but when you get it going its not bad. I get good mileage with this setup though.
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post #5 of 14 Old 08-01-2012, 09:47 AM Thread Starter
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So in nut shell don't go off the gear/tire chart?

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post #6 of 14 Old 08-01-2012, 10:50 AM
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I have stock 410's and 35's, and RIGHT off the line is a bit sluggish (also have stock 1.15 exhaust housing, stock tuning etc), but once I start moving I can do whatever I please with it. Once I get a 1.0 housing and some tunes, I believe this will all disappear.

If you've got 37's, I'd say go w/ 410's or at MOST 4.30s. If you have any tuning/mods done to the truck 410's will probably be fine, especially if you have a 6spd.
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post #7 of 14 Old 08-01-2012, 01:10 PM
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I have 38's and I've ran 5.13's, which were fun off the line, but pointless anywhere else. Currently I'm running 4.56's and though they are much better all around than the 5.13's they are still a bit too low, BUT i'm off-road, short commute and have a led foot. My next set will be 4.30's. IMO go with 4.10's or 4.30's.. if your daily commute is averaging above 55-60MPH then 4.10's. If your a slower driver, tow, or mayeb even go off-road every now and then, 4.30's will make you happy happy happy.



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post #8 of 14 Old 08-01-2012, 01:45 PM Thread Starter
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Thats exactly what I wanted to know! I'm glad someone out there had done the trial and error before I did lol. Looks like from everyone's post and knowledge I'm gonna go with the 4.30s. I'm a 50-60 mph everyday commute but on the beaches in the summer or offroad for the winter hunting season. Thanks to all who helped out! Where is a good place to buy gears?

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post #9 of 14 Old 08-01-2012, 01:48 PM
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No lower than 4.30s 4.10s preferably unless you want to be turning 3500 rpms at 70mph

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post #10 of 14 Old 08-01-2012, 05:12 PM Thread Starter
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So would going with 4.30s at 70 mph throw my RPMs to 3500s. I mostly drive to and from work which is 50-60 mph but i also drive from NC to MO about 2-3 times a year. Would the 4.10 be better on fuel mileage turning 37s or the 4.30s?
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