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Discussion Starter · #1 ·
I was told by a friend that if I change my tires to 35" That I would need to change my gear ratio to 4.56. Can somebody please elaborate on this for me. I have a 2000 Dodge Quad Cab 4X4, with the off-road package.
 

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Say you have 3.55 gears now (you probably do) with a 31" tire.

If you switch to 35" tires, with your current gearing, your effective gear ratio will be:

(31/35)*(3.55) = 3.14

Same tire change, but swapping to 3.91 gears:

(31/35)*(3.91) = 3.46

Same tire change, swap in 4.10 gears:

(31/35)*(4.10) = 3.63

etc.

Unless you have pretty steep gears in there now, you shouldn't have to go higher than 4.10's to keep your effective gear ratio approx the same as you have now.

-SM
 

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unless your lacking in the power dept. or do alot of 4-wheelin, or plan on going bigger in the future go with the 4.10's. if you do any highway driving you won't like to 4.56's
 

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2000 Off-road should already have 4.10:1 gears. 4.56 is the lowest you can go in the 1/2 ton 9.25" rear axle. If you're happy with your current road rpms, I'm sure you'll want the 4.56 gears. However, you may want to try the 35's with your current 4.10s, then upgread to the 4.56's later if you feel you've lost too much power.
 

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Missed the part about the truck....whoops.

(31/35)(4.56) = 4.04

If you do have 4.10 gears currently (and 31" tires), switching to 4.56's will bring you almost back to where you were originally.

What rpm do you run on the highway at 75 mph now? With OD, 4.10's, and 31" tires I am guessing around 2400? With 35" tires, 4.56's and OD 75 mph would be about 2300 rpm.

-SM
 

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the off roads had 33s. so it would be (33/35)(4.10)=3.87, and (33/35)(4.56)=4.30, which is pretty close. i would do like trent said and go with the 35s and 4.10s for now, and if u dont like it upgrade to 4.56s

Duane
 

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Discussion Starter · #7 ·
Thanks guys for your help. I was thinking the 4.56 gears would be a bit much to try at first. Next question, is there any particular brand I should go with or does it matter?
 

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RAMMAN4 said:
Here ya go.
That chart assumes non-OD (1:1 transmission top gear), but the comparison between different gear/tire diameters still applys.
 

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Are you going with 15 inch rims with the 35's or staying with the 17's. If your going with 15's would you want to sell the 17's because i'm looking for a set?
 

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Discussion Starter · #11 ·
chrysler300le said:
Are you going with 15 inch rims with the 35's or staying with the 17's. If your going with 15's would you want to sell the 17's because i'm looking for a set?
Actually when I get the 35's, I will probably look for a new set of rims too, so I will keep you mind when it comes time to get rid of them
 

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Not all 15" wheels will fit a 2000 1/2 ton, check the fit before you buy if you choose to go 15".
 

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tv_larsen said:
Not all 15" wheels will fit a 2000 1/2 ton, check the fit before you buy if you choose to go 15".
Good point there. I know that 15's fit my 94 but don't know if there was any brake changes since then to make them not fit on later trucks.
 

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I was told 15" rims will not clear the front brake calipers on 98 and newer rams. I have a 2000 sport, and there is no way 15's will clear. The stock 16's don't even have much clearance.

15's will fit on 94-97 rams. There are two (a '95 and a '97) parked in front of my house with 15's....both are NOT sports though.

-SM
 

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I had 15x8 AE 589 wheels on my '99 1500. There were considerable changes made to the front brakes on 2000+ 1500's (twin piston calipers i think). However, I've got a buddy running 15x10 aluminum wheels on his '01 1500, I think they were Hellcats. So some will still fit.
 

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15s will fit but you might have to grind the calipers.
 

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yup your gonnna have to grind
 
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