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Discussion Starter #1
hey just wondering what others thought about 4.56 gears and 33's (actually my tires are closer to 34's) i did the math and it doesnt turn out as outrageous as it seems. plus i pull a inclosed car trailer on the weekends so i need a little more grunt. just wanted to see what others thought.
 

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i think 4.56 are too low for 33's. unless you want to snatch the front wheels off the ground, and 6-8 mpg dose not bother you. if you are staying with 33's go with 3.92 or 4.10's at the most.
 

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A friend of mine runs 33's and 4.56s on his Ram and likes them. He does not like long highway trips with them, but will drive the highway for work and such. Just sucks too much gas and turns a bit faster than he would like, awesome take off and passing though
 

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I agree 4.56's with 33's are a little stretch on top end but if you choose some bigger tires in the future you won't have to regear! :bigthumb:
 

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Discussion Starter #5
in case anyone wanted the math with my stock tires and 3.55 going 75 in drive it will turn 2933 if i have my od ratio right it will be 2053 in od. now with 4.56 and the tires i have now in drive it will turn 3389 at 75 and in od 2372. just some food for thought the factory optional ratio of 3.92 with my stock tires would give a rpm of 3238 at 75 in drive and 2267 in od. its just some math but 4.56 gears and my tires that are almost 34 inches is almost the same as the factory 3.92 with my stock tire.so i dont think its crazy as some think it is
 

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I've got 35's with 4:10's and I think that's just right. According to the math, I'm running a little lower than when I was with the stock gears and tires. I've got a good launch off the line but I can still run down the highway with no problem. If you do alot of highway driving, I think the 33's with 4:56's would be too steep. Hope this helps
 

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Discussion Starter #7
no i dont do alot of highway driving i'm lucky if i get past 55 most of time
 

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i may be putting 35x12.5x16 super swampers on my truck soon...i know i am going to change the gearing to probably 4.10, but will this allow me to go a decent speed on the highway without pushing it too hard, because although i have a truck i like speed.i average about 80-85 on the highway...will this be a problem???
 

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Discussion Starter #10
well to give u an idea i cant run in od when i go faster than 75 or 80 becuase it wants to down shift all the time. but thats stock 3,55 with a tire thats 34 inches.
 

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On 2002-04-01 18:40, phoneguy51 wrote:
in case anyone wanted the math with my stock tires and 3.55 going 75 in drive it will turn 2933 if i have my od ratio right it will be 2053 in od. now with 4.56 and the tires i have now in drive it will turn 3389 at 75 and in od 2372. just some food for thought the factory optional ratio of 3.92 with my stock tires would give a rpm of 3238 at 75 in drive and 2267 in od. its just some math but 4.56 gears and my tires that are almost 34 inches is almost the same as the factory 3.92 with my stock tire.so i dont think its crazy as some think it is

At 75mph, 0.69:1 OD ratio

tire dia -- 3.55 ----- 4.56 -------

-- 31" -- 1991 RPM -- 2557 RPM
-- 32" -- 1929 RPM -- 2477 RPM
-- 33" -- 1870 RPM -- 2402 RPM
-- 34" -- 1815 RPM -- 2331 RPM
-- 35" -- 1763 RPM -- 2261 RPM
 

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I went from the stock 265s with 3.55s to a set of 36's and it felt like a dog. I thought long and hard about 4.56s but it would be way too much for my truck since it is a diesel.

I went with 4.10s and have enough torque to push it however I want it.

If you plan to get taller tires or a lift in the future I would get the gears otherwise I think I would stick to 4.10s. If I am not mistaken you will also need new carrier if yo go past 4.10s which will add about $150 or so to the cost.

Bill
 

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Jajeta21 that is the same setup i run. i a, happy ith the power, and also it keeps the millage and top end respectable also. you will run about 10% solower than the speedo reads.
 

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On 2002-04-01 23:47, Bill_L wrote:
I went from the stock 265s with 3.55s to a set of 36's and it felt like a dog. I thought long and hard about 4.56s but it would be way too much for my truck since it is a diesel.

I went with 4.10s and have enough torque to push it however I want it.

If you plan to get taller tires or a lift in the future I would get the gears otherwise I think I would stick to 4.10s. If I am not mistaken you will also need new carrier if yo go past 4.10s which will add about $150 or so to the cost.

Bill

Oh yeah, the diesel is fine with the 4.10s with the low torque it has already.

You do not need a new carrier for the rear DC 9.25" but the front D44 will need a new carrier, which will run $60-80 depending the shop.
 

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FOMOCOboy, I'm pretty sure he still wants to take his truck off the pavement at least once in a while, which is why he bought a DODGE.
 

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I am running 4.56's with 35"x12.50's they are about perfect. I did have to get a new carrier for the front gears to go to 4.56,. but that just gave me an excuse to get a trac loc and not have to pay for an open carrier :): I do wish the 9.25" rears were not so limited or I would have gone with a 4.88 or so because I want to get 38's or 40's next and am worried about the 4.56's being a touch low. My 4.56's are geared slightly lower than stock. I know this because I never adjusted my speedo gear and now with the 35's and 4.56's my speedo reads about 70 at 60. Meaning that the rpm's I am running at 60 I would have been running at 70. Keep in mind, my speedo tells it like it is, unlike the 98's and newer that are not affected by gear changes but only tire sizes.
 

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The first combo that I had was 4,56 with 33´s, and in sand the truck did a great job, on highway maybe it´s not the best combo, but the truck response is very good. Now I´m with 4,56 and 35´s, and it´s a great combo for on and off road, I´ve not try it over sand, but I feel that i will do a great job also. So my advise is GO FOR THEM, better yet if you plan to install 35´s or 36´s in the future.
 

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Discussion Starter #19
hey guys i should have my truck back tonight with the 4.56 gears and posi so i'll let you know how it runs with 33's and 4.56 gears
 
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