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  #1  
Old 04-02-2014, 04:05 AM
icallshotgun88 icallshotgun88 is offline
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Default Gearing for tire size...37" vs 35"

I've been stuggling in deciding between 37"s 35"s

I really want the 37"s but I guess it comes down to if I'll have to change out the gears...I'd really rather not mess with that crap

I think I'm running 3.55s right now.

So I guess my question is, should I change my gearing if I'm going to run 37"s?
Because if it's recommended to change out the gears w/ 37"s then I'll go with 35"s...

Unless I'll need to change out the years either way...?
Because if I have to change them out either way then I'll go 37"s...

Does anyone run 37"s on 3.55 gears? How does it run?
And does anyone run 35"s on 3.55 gears? Is it much different than stock?
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Old 04-02-2014, 11:50 AM
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With 3.55's, I would not go any taller than a 35" tire.

Take a look at this chart for reference....find your gearing and stock tire size, then look at what happens as you go up in tire size and where you should be for gearing. You should try to keep within 200 RPM's of what your stock setup gives you. Anything beyond that and you really feel the loss of power and fuel economy.

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Old 04-02-2014, 12:22 PM
ucanthngwme ucanthngwme is offline
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I have an '08. Just moved up to 35s and feel no difference in power at all. My factory 20s were 33"(275/60/20).
I see people changing gears for 35s. I have no clue why.
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Old 04-02-2014, 01:07 PM
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If you want a proper comparison on where your RPM will be at use THIS gear ratio calculator. A generic one like what's in the chart is using a 1:1 ratio where as Rams have overdrive gears which changes things. You'll have to find what your transmission gear ratios are and then enter in all your other information and it will spit out whatever you want.

37's with 3.55's is definitely going to be a little sluggish... but I wouldn't say it's not driveable. It really depends on how/where you drive and how you want the truck to feel.
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Old 04-02-2014, 02:29 PM
Leons Leons is offline
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If you have the 8 speed
I would not hesitate a minute
37!
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Old 04-02-2014, 02:49 PM
icallshotgun88 icallshotgun88 is offline
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i have the 6 speed, not the 8 speed...

how do i know for sure that im running 3.55s...i asked when i bought the truck but im not 100% sure.

is it written on the truck somewhere?
idk
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Old 04-02-2014, 03:11 PM
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This this link, just enter your VIN in after the "=" sign.

http://www.ramtrucks.com/webselfserv...etServlet?vin=
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Old 04-02-2014, 08:40 PM
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Quote:
Originally Posted by brandonjansen View Post
If you want a proper comparison on where your RPM will be at use THIS gear ratio calculator. A generic one like what's in the chart is using a 1:1 ratio where as Rams have overdrive gears which changes things. You'll have to find what your transmission gear ratios are and then enter in all your other information and it will spit out whatever you want.

37's with 3.55's is definitely going to be a little sluggish... but I wouldn't say it's not driveable. It really depends on how/where you drive and how you want the truck to feel.
The point of my chart was to use as a simple reference point. Stock tire + gear ratio = rpm for reference. Take that and now look at the tire size you want to go to and find the gear ratio that will get you close to stock rpm's. This works regardless of what your final ratio is. Of course, your chart works too if you know all the ratio's to fill in the blanks with. You will find both ways will give you the same answer.

Bottom line is 3.55 gears with 37's and the truck will be a slug unless you are going downhill....
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Old 04-02-2014, 10:23 PM
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how much does it cost to change gears?
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Old 04-02-2014, 10:51 PM
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Quote:
Originally Posted by draken View Post
how much does it cost to change gears?
Someone recently did this....was it Andrew or Brandon maybe? I'm sure whoever it was will respond. From what I remember, its not cheap due to the front diff design on our trucks.
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