33" tire, 4.56 or 4.??

[djlarroc]

i bought a set of (5) 33x10.50s for a score, and as much as i'd like to run them, i talked myself back into selling them and keeping the 31s. when these wear out, i will go to 32s, but that's as tall as i'll go, mainly because of the 4:10s.

 

[westvirginia24976]

:anon: Hate on me now, but until funds allow 33's and 3:55's and 3rd gear in aw4 works well for me and pretty good mileage too.

 

[2001XJ]

I got 4.56 but now I want 35 tires should have done the 4.88

HAHA, this is me now. In the process of upgrading....

 

[blondejoncherokee]

go as deep as you can, that means with a 3 you are stuck at 4.88. I ran 31s,33s, 35s, and 37s, currently back down to 35s. all on 4.88s . 31s where fine, 37s it was a bit of a dog. Id stay in the 33-35" range with 4.88s for best power . thing was very fast with the 31s and 4.88s.

 

[Alexia]

4.88 with 32"/33" is like having a little rocket engine in the back that quickly burns out. 4.88 if you ever think you will end up with 35" tires. 4.56 if you want the best mix between fuel economy and power.

 

[steveareno]

I live in the mountains, 99 DD with auto; went from 31s with 3:55 to 33s (285x70) with 4:56. I am glad I did not go any less. Still sometimes it down-shifts going up grades. Gas
milage suckes, but that is another issue non-related to re-gearing. Go 4:56.
Once you go from 31s to larger it is a whole new world of required modifications - cutting, re-gearing, lift, cutting (yes, some more to tuck up), wheels, etc.

 

[bobnoxious]

Love these threads :yap:

 

[Demonoid369]

Hate to start a sh!t storm hopefully not but I saw this in another thread and it got me thinking, the stock tire size for a jeep chero was about 28" which shown with this chart on stock 3.55 gears gave you around 2k rpm so with that knowledge, wouldn't 4.10 gears be set correctly for a 32"-33" tire? And not 31"?
And wouldn't 4.56 be better suited for 35" and up?
I've gone and confused myself now lol


RPM's at 65 MPH/105 KPH w/ 3.55:1 axle gears running 28's: 2,076 RPM
RPM's at 65 MPH/105 KPH w/ 3.55:1 axle gears running 30's: 1,938 RPM
RPM's at 65 MPH/105 KPH w/ 3.55:1 axle gears running 31's: 1,876 RPM
RPM's at 65 MPH/105 KPH w/ 3.55:1 axle gears running 32's: 1,817 RPM
RPM's at 65 MPH/105 KPH w/ 3.55:1 axle gears running 33's: 1,762 RPM
RPM's at 65 MPH/105 KPH w/ 3.55:1 axle gears running 35's: 1,661 RPM

RPM's at 65 MPH/105 KPH w/ 4.10:1 axle gears running 28's: 2,398 RPM
RPM's at 65 MPH/105 KPH w/ 4.10:1 axle gears running 30's: 2,238 RPM
RPM's at 65 MPH/105 KPH w/ 4.10:1 axle gears running 31's: 2,166 RPM
RPM's at 65 MPH/105 KPH w/ 4.10:1 axle gears running 32's: 2,099 RPM
RPM's at 65 MPH/105 KPH w/ 4.10:1 axle gears running 33's: 2,035 RPM
RPM's at 65 MPH/105 KPH w/ 4.10:1 axle gears running 35's: 1,919 RPM

RPM's at 65 MPH/105 KPH w/ 4.56:1 axle gears running 28's: 2,668 RPM
RPM's at 65 MPH/105 KPH w/ 4.56:1 axle gears running 30's: 2,490 RPM
RPM's at 65 MPH/105 KPH w/ 4.56:1 axle gears running 31's: 2,409 RPM
RPM's at 65 MPH/105 KPH w/ 4.56:1 axle gears running 32's: 2,334 RPM
RPM's at 65 MPH/105 KPH w/ 4.56:1 axle gears running 33's: 2,263 RPM
RPM's at 65 MPH/105 KPH w/ 4.56:1 axle gears running 35's: 2,134 RPM

RPM's at 65 MPH/105 KPH w/ 4.88:1 axle gears running 28's: 2,855 RPM
RPM's at 65 MPH/105 KPH w/ 4.88:1 axle gears running 30's: 2,664 RPM
RPM's at 65 MPH/105 KPH w/ 4.88:1 axle gears running 31's: 2,579 RPM
RPM's at 65 MPH/105 KPH w/ 4.88:1 axle gears running 32's: 2,498 RPM
RPM's at 65 MPH/105 KPH w/ 4.88:1 axle gears running 33's: 2,422 RPM
RPM's at 65 MPH/105 KPH w/ 4.88:1 axle gears running 35's: 2,284 RPM

 

[dart70LA]

You are correct, mathematically. But in the real world a lifted vehicle with bigger tires has to move more air to travel down the highway. Add some weight and hills and 4.10 and 33 will not "feel" like the factory 3.55 and 28 inch combination. Same for 4.56 and 33. This was stated more thoroughly earlier in the thread by Ben824.

Hate to start a sh!t storm hopefully not but I saw this in another thread and it got me thinking, the stock tire size for a jeep chero was about 28" which shown with this chart on stock 3.55 gears gave you around 2k rpm so with that knowledge, wouldn't 4.10 gears be set correctly for a 32"-33" tire? And not 31"?
And wouldn't 4.56 be better suited for 35" and up?
I've gone and confused myself now lol

 

[Demonoid369]

You are correct, mathematically. But in the real world a lifted vehicle with bigger tires has to move more air to travel down the highway. Add some weight and hills and 4.10 and 33 will not "feel" like the factory 3.55 and 28 inch combination. Same for 4.56 and 33. This was stated more thoroughly earlier in the thread by Ben824.

That's what I needed to hear, just had to make sure since numbers can be compelling lol

 

[Mpeckham22]

Those who think 3.55's and 35's are fine are idiots, I did it for one day and it was horrific, did 33's and 3.55's for a year and it was ok but not great if I was to do it again id just get some 4.10 junkyard axles and call it good

i know this is kinda a thread jack... but what has 4.10 axles stock? probably arent bolt in huh?

 

[Demonoid369]

some of the 4 banger engine jeeps had the 4.10 gears in them, I think a few others did too but I'm not sure

 

[NW-ZJ-SCOTT]

some of the 4 banger engine jeeps had the 4.10 gears in them, I think a few others did too but I'm not sure

2.5 with a 5 speed = 4.10 gears
2.5 with a 4 speed = 3.73 gears
2.5 with a automatic = 4.56 gears

 

[rocknxj]

I'll chime in and say 4.56 and 33" (closer to 32" in reality) is great through the entire power band. Been driving this config for nearly 4 years and no complaints.

 

[89xjchris]

i did 3.55 with 33s with a aw4, HORRIBLE. But now that i have 4.88s i think its perfect

 

[ruger81]

4.56 gets you crawl ratio.

4.10 gets you economy.

I don't want to see another "I only gt 10MPG from my XJ" thread

When you are done, spend the extra $40 for a speedo gear. I didn't and for years spent tim in my head figuring out what speed I was going. For $40 you fix the speedometer, odometer, and PCM feedback.

Actually if your Speedo has never been changed 33 and 4.56 will bring ur Speedo back to stock if you care!

Do 4.88s and dont look back

This is what I run love it ! I always 're gear for the next size bigger tire than I plan on running.
I currently run 33's and 4:88.

And one more thing I realize your new to naxja but so far you ha've asked a lot of common questions that u can answer simply by searching.

 

[Demonoid369]

ya the search button seems to not register 4.56 because I kept plugging that in and nothing till I started going through ALL the pages and found a few but they mainly just go off of opinions and I hate those answers, I'm more of a factual person.
I do realize the question I asks seem common but I just notice a lot of the common questions have holes in them and I'm a very technical thorough guy lol so i have to ask the stuff that wasn't like with the cowl, i hadn't seen anything about the angles and if they affect it. or those that did the cowl, didn't use a scoop backwards to keep water and all that out while allowing fresh cold air, etc... also I hope that the more thorough I ask the more detail it'll be helping others that think the same lol so sorry about that, its a habit of trying to fill all the holes in a question or answer

 

[89xjchris]

your in salem eh? If you make it to portland you can drive mine around to see how you like it. 98 xj on 33's and 4.88 with a aw4

 

[bobnoxious]

Actually if your Speedo has never been changed 33 and 4.56 will bring ur Speedo back to stock if you care!

Not even remotely close...4.56/33"

 

[clean4drxj]

Is that an app on your phone? if so that would workout mint till I get my speedo gear..