32" tires with stock gears

[MrShaft696]

those who think its fine must have never riddin in a geared jeep

Couldn't have said it better, its just the way it is. Guys who have daily driver responsibility have might think a little different. I dont know anyone that has ever said ahhh crap I geared it too deep.

 

[themangeraaad]

Couldn't have said it better, its just the way it is. Guys who have daily driver responsibility have might think a little different. I dont know anyone that has ever said ahhh crap I geared it too deep.

I sure hope your right. Just picked up the rear axle at 4.88. Getting that rebuilt this week or next and getting the D30 geared as well. I really don't want to gear the 30 but I don't have time to build anything else. I should be doing about 65mph at 2700rpm in 5th. :rof:

 

[the_weirdo]

I hated 31's with 3.55 gears and an auto. I hated it so much it only took me 1 week to get them swapped out for 4.56 gears. Now that I have 33's, I wish I went to 4.88.

 

[ROBZ95Xj]

I sure hope your right. Just picked up the rear axle at 4.88. Getting that rebuilt this week or next and getting the D30 geared as well. I really don't want to gear the 30 but I don't have time to build anything else. I should be doing about 65mph at 2700rpm in 5th. :rof:

it will live at 3k all day and be happy, dont worry about them rpm's

 

[Goatman]

I've got 33's and an RE lift sitting there waiting to be put on. I just ordered the 4.88 gears for the D30 and a D44. The 33's go on when the 4.88's go in.

 

[techno1154]

:dunno:I have been following this thread for a while. It is amazing the number of people on here uses 31" to 33" tires with stock gears and say it is OK. This conversation have been going on for years in other threads here at . Yet I find it quite entertaining when I read other's comments regarding large tires and stock gears. It make me think my XJ is inferior.

I had 30" tires with the stock3.55 gears carring about 300 lbs of stuff in the back and it was horrible every where except on long flat highways. Then again onthe highways every miniscule incline would set the AW4 in a gear hunting tantrum (my cruise control set between 65 and 70 MPH). Shift the gear lever into 3, the RPM's at 3,300+ and watch my milage go out the tail pipe. My XJ achieves best milage between 2,200 and 2,600 RPM.

Mileage is important to me since I use my XJ to take me to work from Miami to Iowa, Maryland, Missouri, Texas to name a few. I used to average 17 MPG. Since going to 4.10, the get-up-and-go have returned. I could take off from a stop without the guy behind me honking at me. I could over take on the highway with out putting the pedal to the floor. I could cruise the highway and up and down hills and not have to worry as to wether or not the AW4 is happy. Most inportantly, I am getting 20+ MPG. I think the Xj could use 31's now with the 4.10 but ???? :dunno:

April 10, 2008

RPM’s at 55 MPH with 4.10:1 gears running 30” tires 1980
RPM’s at 60 MPH with 4.10:1 gears running 30” tires 2175
RPM’s at 65 MPH with 4.10:1 gears running 30” tires 2360
RPM’s at 70 MPH with 4.10:1 gears running 30” tires 2550
RPM’s at 75 MPH with 4.10:1 gears running 30” tires 2700
RPM’s at 80 MPH with 4.10:1 gears running 30” tires 2920

 

[garr]

Most here would agree that a stock XJ drives great, Quick off the line (For a Jeep) fast enough on the Highway, Passes nicely; A good combo of Gear (3.55/1 for the aw4), tire (215/15s, around 27.5"), engine & Moderate weight.
Jeep really had their act together back in the day!

When comparing to a stock XJ, by adding 33” tires and keeping your stock gears you are reducing your effective gear ratio to around 3.0/1.
Then if you take into account the extra un-sprung weight of the heavy 33" tires & wheels you are knocking the 3.0/1 down to 2.5-2.7/1 9 (Don't forget the weight of all those goodies you installed, Bumpers, Rails, Etc..)

With the stock engine & stock 215/15 tires & adding 2.5/1 gearing you have all the makings a DOG of a vehicle that only the YUGO, or one of those Russian Cold War era Car factories (You know, The ones they used to show the videos of where they would use a 5lb sledge to bang the door hinges into shape so the doors would close) would be proud to produce!

Hey, But at least it looks cool on the 33s:roflmao:!

 

[3XJFamily]

"It's going to be a royal pain, horrible but doable, it's bearable, I got used to it, You can do it. . ." Lines from posts describing running 32's or 33's and stock gears (seems like I've heard the same line in movies describing prison sex. . .).

"Yee Haw, Dang that's great!" General consensus on running 4.56's or 4.88's with same tires.

Nuff said, your choice.

 

[95' heep]

I know the manuals are 3.07's and Auto's are 3.55's with the 4.0 and the 2.5's have 4.10s. I have only had this current jeep for 8 days. Its getting an 8.8/4.10 D30 swap when I secure the axles. I know Its not ideal running 31's on stock gears but I will have to get used to it for a while. Its really not that bad but it could be better. My jeep is being built to Drive everyday and still wheel, don't think I am keeping it like that for too long. I'm thinking 34's would suck though!

See above! Its just a matter of getting extra money while on unemployment for me.

Thats me you're speaking about? :wave:

I am running 34's TSL on 3.55, let me tell you, it do OK for off road in 4low BUT I find it LACK of power for hill climbing where you need power the most. I always have the pedal to the floor constantly when I try to make a difficult hill.

My BlaZeR-2 have 33's and 4.56, it have more than enough power to rip around. generally the GM 4.3 and 4.0 I-6 have similar HP/TQ to boot

I am NOT going to regear the D30/8.25 because they work good enough for a trail rig/trailer queen and I have a D44 front and GM14 rear to go in with 5.13 so that should be plently good

 

[derrickdrew17]

i have 31MT with 3.55 gears.. Like some one posted above for get about towing... Im hopeing to get 8.8 with 4.10's until then im living with what i have.

 

[FlexdXJ]

Thats me you're speaking about? :wave:

I am running 34's TSL on 3.55, let me tell you, it do OK for off road in 4low BUT I find it LACK of power for hill climbing where you need power the most. I always have the pedal to the floor constantly when I try to make a difficult hill.

My BlaZeR-2 have 33's and 4.56, it have more than enough power to rip around. generally the GM 4.3 and 4.0 I-6 have similar HP/TQ to boot

I am NOT going to regear the D30/8.25 because they work good enough for a trail rig/trailer queen and I have a D44 front and GM14 rear to go in with 5.13 so that should be plently good

No actually it wasn't but good to hear the perspective. I see a lot of guys saying those who say its ok haven't driven a geared Jeep. When it comes to me they are right. I am sure i will love my jeep when it has 4.10's but right now its not happening for me. As much as i would love to dump 500 on a pair of axles and throw them under it its just not in my budget! I god laid off a couple weeks ago so money is tight until i start tearing my wrecked XJ apart and selling parts. My buddy is running 33's and 3.55's on his ZJ and the trans is giving out on him. He's buying my AW4 to replace that and I hope he spends some of his tax check on gears!

 

[xjbrian219]

i'm running 32x11.50s. I6 and auto trans. 3.55 gears. i get 14-15mpg in town...16 on the highway. i drive 40-50 miles daily. done this a year with this xj...no problems. my old xj ran 33x12.50s on 3.73 gears with similar results. you'll be just fine.

 

[codyyy]

The only problem I'm having (other than a tight budget) is not knowing what gears to go with when sitting at a 32 or 33. I don't want to gear this Jeep again. I've done the calculations and everything, and I know a 4.10 with a 32 will bring it back to its factory setting.
Now here comes the fun part, where you get the "Jeep opinion" (usually overkill by most standards). Jeepers say I should go with a 4.56. Ford Ranger and most everyone else say that is too low for a DD Jeep.
I can snag 4.10 axles out of a 4-banger for extremely cheap compared to buying gears, master install kits, carriers, and any other misc. parts. Not to mention I can sell my axles and get some or most of my money back.
4.56s would be nice though, and I've calculated it out that buying gears, master install kits, carriers, a rear axle (from the junkyard), and a lunchbox locker for one axle to sum up to about $800-900. That might take me a long time to save up for at this point because I have many other things I have to get to. It is still possible though, and worth it.
I wish I could just borrow someone's rear axle with 4.10s for a day or two and find out how it feels. If I don't like it, I know what I need to do.

 

[jk_surgeonfish]

Yep..... would be nice to just borrow one. I would rather be geared a tad too low than high. Plus, I would like to be able to tow my tent trailer and not have a problem. I have 31s and 3.55s right now and it is fine around town but I know I can't tow and it does require more right foot when off-road. My plan is to put in 4.56s and be done with it. I don't daily drive it and my next tire set will be 32.... or 33s. That'll be awhile though.

 

[garr]

The only problem I'm having (other than a tight budget) is not knowing what gears to go with when sitting at a 32 or 33. I don't want to gear this Jeep again. I've done the calculations and everything, and I know a 4.10 with a 32 will bring it back to its factory setting.
Now here comes the fun part, where you get the "Jeep opinion" (usually overkill by most standards). Jeepers say I should go with a 4.56. Ford Ranger and most everyone else say that is too low for a DD Jeep.
I can snag 4.10 axles out of a 4-banger for extremely cheap compared to buying gears, master install kits, carriers, and any other misc. parts. Not to mention I can sell my axles and get some or most of my money back.
4.56s would be nice though, and I've calculated it out that buying gears, master install kits, carriers, a rear axle (from the junkyard), and a lunchbox locker for one axle to sum up to about $800-900. That might take me a long time to save up for at this point because I have many other things I have to get to. It is still possible though, and worth it.
I wish I could just borrow someone's rear axle with 4.10s for a day or two and find out how it feels. If I don't like it, I know what I need to do.

4.10 & 31s are perfect.
4.10s & 32 are not bad, If you are on a budget & can find a good 4.10 rear for a good price go for it!

 

[codyyy]

I'll probably try to borrow a rear axle and see. I plan to go with 33s next so who knows if 4.10s will do it for me. Gas mileage is a concern too, but at this point if I can get any better MPG than I do now I'd be happy.

 

[shawnhancel]

i have 3.73 and 31X10.50X15 Goodyear ATs. i can do 70, did from pittsburgh to chicago, and didnt notice any loss of mpg's. at home in pittsburgh i spent time in the woods, deep ruts on hill wasnt nothing. pulled my buddies exploder out a ditch, no prob. how ever i ordered bumpers today, and im thinking going back to base in norfolk va i may regear to a 4.56 or 4.11s inside a ford 8.8. unless somebody thinks this isnt a good idea.

 

[JAS]

I have run 31x10.50 for 4 years on 3.55 and the AW4 Auto... It sucked... On highway it would shift just to pull what was a little grade change... And we do not have any mountains in Michigan.

I just put in 4.88 and I and I am break in period now. I do plan on 34-35s as the next mod so I will put up with the 4.88 until then

Jeff

 

[M4Madness]

The only problem I'm having (other than a tight budget) is not knowing what gears to go with when sitting at a 32 or 33. I don't want to gear this Jeep again. I've done the calculations and everything, and I know a 4.10 with a 32 will bring it back to its factory setting.
Now here comes the fun part, where you get the "Jeep opinion" (usually overkill by most standards). Jeepers say I should go with a 4.56. Ford Ranger and most everyone else say that is too low for a DD Jeep.

Like I mentioned in a post above, I drove 22,000 miles on 32's/3.55's, and my rig is in the shop as I type getting 4.56's installed. You're right -- 4.10's will put you right back to stock, but let's face it, 4.56's will give you that extra bit of "oomph" when needed. And 4.56's with 32's in OD will be close to 100 RPM's LESS than 3.55's with 32's in 3rd gear, which is how I've been driving mine to keep the RPM's up.

 

[shawnhancel]

is there a chart that shows gears tire size rpm and speed. i noticed someone posted something before, but im looking to upgrade to, just want to know more. i saw the thread about what gears to use. but is there another formula when figuring out all these or just experience? and when you say back to stock is that speed on the dash or the amount of strain on the transmission, and engine?