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  #1  
Old January 16th, 2020, 16:40
JonnyCat63 JonnyCat63 is offline
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Another Gearing Thread.

Wanted to get real world feedback on the gearing I'm leaning towards on my latest build. I've got a 99XJ, 4.0/AW4/242/D30/8.25. Going to run 33's. I'm getting ready to build the axles and am strongly leaning toward 4.88 for the gearing. Won't be a daily driver, but I occasionally will drive it up to 2-3 hours to go wheeling. Eventually I want to get a car hauler trailer and go that route, but that's a couple of years off. It will mostly get stored at my desert place, so it will be mostly a trail rig.
From all the different threads I have read, much of the consensus is 4.56 with 33's.
But here's my dilemma, my other 2 similar set up (mostly trail rigs) XJ's are running 31's with 4.10's, and I just sometimes feel I should have gone 4.56 on 31's. I feel like deeper gears would be better off road. I'm not sold on 4.56's with 33's.
So, for those of you that are or have run 4.88 with 33's, what's your opinion? Are you glad you did it? Was it horrible on the freeway? I'm really looking for people who have had experience with this set up.
Any feedback would be appreciated. Thanks.
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  #2  
Old January 17th, 2020, 10:07
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jimbar jimbar is offline
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Re: Another Gearing Thread.

I've built and wheeled all of the configs you list above at one time or another. IMO 33" and 4.56 are the way to go assuming the following.
Basically a somewhat stock rig ( yeah. this includes armor) using a d30 and cry 8.25 and being used as a wheeler/daily driver. I like the 4.88's for a mostly off road rig but freeway does get a bit buzzy (not that the 4.0 cant handle it, it can). Note: if your 33" actually measure out to something closer to 32.* maybe 4.56 are the way to go. Personally I've always thought 33" are the cross over point. By that I mean if you go bigger, now your looking at steering upgrades, frame stiffeners, axles, etc... Anyhow thats my.02$
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  #3  
Old January 17th, 2020, 11:05
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clydefrog clydefrog is offline
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Re: Another Gearing Thread.

4.88 with your setup, will make the rig more usable, even with the occasional 2-3 hour trip.

I have 4.56 with 33's and I am happy, I also have an LS so power isn't an issue, in your case 4.88 would be the best choice.
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  #4  
Old January 17th, 2020, 11:09
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sdspearo sdspearo is offline
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Re: Another Gearing Thread.

If not a DD and mostly a trail rig I would go with 4.88. Not sure anyone ever wished they had higher gearing while on the trail. For reference, I'm running 4.88 and 35's and it seems perfect, although I have a manual 5 speed.

What part of SD are you in?
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  #5  
Old January 17th, 2020, 11:20
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XJEEPER XJEEPER is offline
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Re: Another Gearing Thread.

I've run 4:88's and 33's (285/75/16 and 295/75/16) with an AW4 in my 2000 XJ for the past 12 years, putting 100k miles on this setup daily driving/weekend wheeling. Avereage hwy mpg is 16-17, on a rig with 5.5" of lift and 220k miles on the original engine and typical elevations between 4000 and 10000 ft.

I would never recommend 4:56's with this tire/trans combo, 4:88's are perfect both on and off-road.

Did you not read this thread? https://www.naxja.org/forum/showthread.php?t=1157028
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Last edited by XJEEPER; January 17th, 2020 at 11:25.
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  #6  
Old January 17th, 2020, 11:59
Black1990jeep Black1990jeep is offline
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Re: Another Gearing Thread.

Another option is a diferent low gear in the transfer case to give you offroad power low, but retaining stock gear in high, That is what I have on my XJ with 33 tires, 4.11 diffs, renix motor, lots of weight from added gear. Still a bit of a dog on freeways and steep roads, but put her in low for offroad, with a 4.1 transfer case low ratio and she does nice.
I might regear her diffs sometime, but it is a big job, go other priorities

When the jeep became my owner, it was set up his way. Prior person geared for 31 tires he bought for the jeep, then later switched to 33 tires
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  #7  
Old January 17th, 2020, 21:23
JonnyCat63 JonnyCat63 is offline
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Re: Another Gearing Thread.

Quote:
Originally Posted by jimbar View Post
I've built and wheeled all of the configs you list above at one time or another. IMO 33" and 4.56 are the way to go assuming the following.
Basically a somewhat stock rig ( yeah. this includes armor) using a d30 and cry 8.25 and being used as a wheeler/daily driver. I like the 4.88's for a mostly off road rig but freeway does get a bit buzzy (not that the 4.0 cant handle it, it can). Note: if your 33" actually measure out to something closer to 32.* maybe 4.56 are the way to go. Personally I've always thought 33" are the cross over point. By that I mean if you go bigger, now your looking at steering upgrades, frame stiffeners, axles, etc... Anyhow thats my.02$
Good point, and I'm going to make sure the tires measure a true 33". Jeep will not be a DD and I didn't list all I am doing to it right now. Full set of frame stiffies from IRO, front and rear IRO trusses, Just finished burning in my spacers tonight for my WJ knuckle swap, with steering and track bar upgrades, front and rear lockers.
Appreciate your input!
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  #8  
Old January 17th, 2020, 21:27
JonnyCat63 JonnyCat63 is offline
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Re: Another Gearing Thread.

Quote:
Originally Posted by sdspearo View Post
If not a DD and mostly a trail rig I would go with 4.88. Not sure anyone ever wished they had higher gearing while on the trail. For reference, I'm running 4.88 and 35's and it seems perfect, although I have a manual 5 speed.

What part of SD are you in?
I am leaning towards 4.88's, especially based on my experience with 4.10's and 31's.

I'm in Normal Heights. The wife and I have his and hers XJ's. We have a place down in the Salton Sea area, so we mostly wheel in Ocotillo Wells and surrounding areas. We'll do Big Bear, too.
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  #9  
Old January 17th, 2020, 21:30
JonnyCat63 JonnyCat63 is offline
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Re: Another Gearing Thread.

Quote:
Originally Posted by XJEEPER View Post
I've run 4:88's and 33's (285/75/16 and 295/75/16) with an AW4 in my 2000 XJ for the past 12 years, putting 100k miles on this setup daily driving/weekend wheeling. Avereage hwy mpg is 16-17, on a rig with 5.5" of lift and 220k miles on the original engine and typical elevations between 4000 and 10000 ft.

I would never recommend 4:56's with this tire/trans combo, 4:88's are perfect both on and off-road.

Did you not read this thread? https://www.naxja.org/forum/showthread.php?t=1157028
Thanks for the input. I did read that thread, and you're one of the reasons I posted this one. You're the culprit! LOL!

Most everyone was pushing the 4.56's, but you really got me thinking about 4.88's, and I thank you for that!
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  #10  
Old January 17th, 2020, 23:51
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sdspearo sdspearo is offline
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Re: Another Gearing Thread.

Quote:
Originally Posted by JonnyCat63 View Post
We have a place down in the Salton Sea area, so we mostly wheel in Ocotillo Wells and surrounding areas.
Cool, I'll be camping/wheeling at Superstition Mtn next weekend. Will be my first time out there. Next time you're looking for someone to wheel with look me up
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  #11  
Old January 18th, 2020, 10:25
JonnyCat63 JonnyCat63 is offline
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Re: Another Gearing Thread.

Quote:
Originally Posted by sdspearo View Post
Cool, I'll be camping/wheeling at Superstition Mtn next weekend. Will be my first time out there. Next time you're looking for someone to wheel with look me up
Absolutely, I'll let you know. Planning a couple of outings in Ocotillo in February. As soon as I nail down the dates, I'll shoot you a pm.
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  #12  
Old January 22nd, 2020, 14:49
89Mock 89Mock is offline
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Re: Another Gearing Thread.

What is the advantage of 4.56 gears over 4.10s off road on the same vehicle? Calculators can tell me the crawl ratio is higher so I can assume I'll go slower. Does it put the RPMs higher before wheels start moving so it prevents over heating? Does it give me more wheel spin? I can't see why I'd want to switch to 4.56 yet when I haven't found a spot where I couldn't get up so far.
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  #13  
Old January 22nd, 2020, 17:18
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jimbar jimbar is offline
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Re: Another Gearing Thread.

Think of it like this....

It's in the place where if have to ask you'll never know. If you know then you don't have to ask..

Extra points for anyone who can tell me where I got that from....
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  #14  
Old January 26th, 2020, 16:33
Einulfr Einulfr is offline
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Re: Another Gearing Thread.

I always felt like I was pushing too many RPMs on the highway with 4.56 and 33s. Not horrible, but since I daily drove it, it was probably more noticeable to me. Feels perfect with 35s now. Of course with a 4:1 case, I never had any reason to go 4.88 or above. The pinion mesh with the ring gear at 4.88 is kind of scary anyway; I would just go with a beefier axle at that point.
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  #15  
Old January 28th, 2020, 09:49
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lazyxj lazyxj is offline
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Re: Another Gearing Thread.

Quote:
Originally Posted by jimbar View Post
It's in the place where if have to ask you'll never know. If you know then you don't have to ask..
Extra points for anyone who can tell me where I got that from....
Harry Potter

I have run both 4.10 and 4.56, running 33"s.
It just runs better and gets better mileage with the 4.56s, keeping the RPMs higher in the power range, with less downshifting on grades.
Cruising RPMs with the 4.56s is similar to stock gearing with stock tires.
What's not to like?
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