the taller the tire, the higher your gears go........for instance, if your Jeep came with 30" tires and you have 3:73 gears, they will be around 3:07 with 35" tires on. You will loose your crawl ability, and getting up to high way speed ability. Antman has the right gears for his 35's. There are several sites that give recommended gears for various tire sizes. I have 4:10's and am running 33" tires, but I also have a 4:1 gear ratio in my transfer case in 4 low. If you are going to re-gear, I highly recommend putting in lockers at the same time. Doing both will save you a ton of time and money. It will give you a whole new realm of wheeling. Be careful with that new realm........it causes high levels of excitement !!!!!!!
By the way Zakkbowman, that is a sweet looking Jeep you have!!!
ok thats what acouple off my buddys said to do. im workin with stock axles. i was told to do dana 35 in fron and a dana 44 in the rear with an ARB.
You won't have a Dana 35 front axle, they don't make them. Odds are in your YJ you have a Dana 30 front axle. That is what they put in there from the factory. In that case the deepest gearing you can go with is 4.88. The 44 will go to 6.38 I believe, but since they have to match sticking with 4.88 will be the way to go for you.
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Once again, I think that the whole "weekend warrior" thing he has mentioned is gonna come into play. When you put those big old mule gears in-sure-it'll turn those 35s, but wait till you hear your motor whizzin up around 4 thousand rpms on the freeway. Its one thing if this is gonna be a complete offroader that will never go above 40, but I would say you won't like the performance on the street. IDK. Take it or leave it. But look at how the guys with trucks do it, they want bigger tires, they have more horses to let the motor naturally keep up.
Actually the gears get you back to running the correct RPM. Sure, if you throw in 4.88's with 27" tires you'll be at redline at 45, but with the bigger tires you need the gears to keep the RPM's in the optimum range. Running too low RPM's will kill your performance just as much as too high does. More horsepower is never a bad idea, but an engine is designed to perform in a certain RPM range. A 1000HP lamborghini engine isn't going to perform well if you can't get it above 1500 RPM. It is the gearing that allows an engine to perform in the correct range.
Exactly right, daddyjeep, that is what I was trying to say in my first comment above. The taller the tire, the lower you have to gear, to keep within the same rpm range. A friend of mine has a YJ with 35" tires, and put in 488's. He is very happy to be able to use 5th gear again on the highway. It will cruise 75mph all day long now, with out straining the engine. He also put in a Deep V Klune, so he has some serious low crawling ratio's.