Nikson
Explorer
I've seen on some sight from a guy in Australia if I remember correct, he did that mod himself., didnt seem to complicated...
that is also something to consider... since 1st would be a good thing to have on some start ups...
Locker / Gear setup...
- Thread starter Nikson
- Start date
I've seen on some sight from a guy in Australia if I remember correct, he did that mod himself., didnt seem to complicated...
that is also something to consider... since 1st would be a good thing to have on some start ups...
Nikson
Explorer
Well, thats where 4.56 will be probably perfect...
DrMoab
Explorer
I run 33 inch tires and 4:56 gears. Most of the time it's fine but I wish I would have went 4:88s instead.
The Adam Blaster
Expedition Leader
My XJ:
1998 4.0 242 30/8.25 stock gearing (currently) and just getting the last details finalized on the 4.5" RE lift.
I used to have a 3" Skyjacker kit and ran 31's <-- I really enjoyed the Jeep during this time, 'wheeled like crazy, towed a utility trailer several times a week picking up building supplies for my rental property and doing runs to the dump or getting loads of firewood etc. A truly great setup for light wheeler and daily driver/utility rig
But, I got a ridiculous deal on 33" tires and 10" wide wheels a couple years back and decided to get the 4.5 lift.
Somewhere in the middle while still on 31's I was hearing some noise from the rear end, had it looked at and it needed some work. I can't exactly remember what it was, but I bought a Detroit Locker as it would replace the carrier and that needed to be done anyway.
I LOVE the extra traction I get with the Detroit, but on the highway it acts a bit funny. When I am on power the locker will engage and the Jeep pulls a bit to one side, and when I let off, it pulls the other way. It's not a major pull, more like a little wiggle, but it's noticeably preasent, and you have to correct as you're driving. That's the only negative about the locker I've found.
Now with the bigger meat on the corners, I've been throwing around the idea of going to better gearing. I had 4.56's in mind as well, but some of the responses are making me consider the 4.88's...
My Cherokee will see mostly weekend 'wheelin, but I have to drive a minimum of 1.5 hours to get to decent trails. And there are also some really nice areas 4-5 hours away that I'll want to visit. I haven't considered a front locker because of the amount of highway mileage the Jeep will see.
I've heard with some lockers you have to go with manual hubs on the front to prevent it from being engaged, not sure how accurate that info actually is though???
And of course, cost is always a factor as usual. I know I need a front bumper with decent tow points before I need gears...
Anyone want to loan/give me about $5000.00 for my toys?
Failing someone being exceptionally generous, I'm going to have to wait until either late summer or fall, or maybe Christmas. But, I'll still go 'wheelin and exploring, I'll just have to have someone behind me to pull me backwards when I get stuck.
1998 4.0 242 30/8.25 stock gearing (currently) and just getting the last details finalized on the 4.5" RE lift.
I used to have a 3" Skyjacker kit and ran 31's <-- I really enjoyed the Jeep during this time, 'wheeled like crazy, towed a utility trailer several times a week picking up building supplies for my rental property and doing runs to the dump or getting loads of firewood etc. A truly great setup for light wheeler and daily driver/utility rig
But, I got a ridiculous deal on 33" tires and 10" wide wheels a couple years back and decided to get the 4.5 lift.
Somewhere in the middle while still on 31's I was hearing some noise from the rear end, had it looked at and it needed some work. I can't exactly remember what it was, but I bought a Detroit Locker as it would replace the carrier and that needed to be done anyway.
I LOVE the extra traction I get with the Detroit, but on the highway it acts a bit funny. When I am on power the locker will engage and the Jeep pulls a bit to one side, and when I let off, it pulls the other way. It's not a major pull, more like a little wiggle, but it's noticeably preasent, and you have to correct as you're driving. That's the only negative about the locker I've found.
Now with the bigger meat on the corners, I've been throwing around the idea of going to better gearing. I had 4.56's in mind as well, but some of the responses are making me consider the 4.88's...
My Cherokee will see mostly weekend 'wheelin, but I have to drive a minimum of 1.5 hours to get to decent trails. And there are also some really nice areas 4-5 hours away that I'll want to visit. I haven't considered a front locker because of the amount of highway mileage the Jeep will see.
I've heard with some lockers you have to go with manual hubs on the front to prevent it from being engaged, not sure how accurate that info actually is though???
And of course, cost is always a factor as usual. I know I need a front bumper with decent tow points before I need gears...
Anyone want to loan/give me about $5000.00 for my toys?
Failing someone being exceptionally generous, I'm going to have to wait until either late summer or fall, or maybe Christmas. But, I'll still go 'wheelin and exploring, I'll just have to have someone behind me to pull me backwards when I get stuck.
Nikson
Explorer
My XJ:
1998 4.0 242 30/8.25 stock gearing (currently) and just getting the last details finalized on the 4.5" RE lift.
I used to have a 3" Skyjacker kit and ran 31's <-- I really enjoyed the Jeep during this time, 'wheeled like crazy, towed a utility trailer several times a week picking up building supplies for my rental property and doing runs to the dump or getting loads of firewood etc. A truly great setup for light wheeler and daily driver/utility rig
But, I got a ridiculous deal on 33" tires and 10" wide wheels a couple years back and decided to get the 4.5 lift.
Somewhere in the middle while still on 31's I was hearing some noise from the rear end, had it looked at and it needed some work. I can't exactly remember what it was, but I bought a Detroit Locker as it would replace the carrier and that needed to be done anyway.
I LOVE the extra traction I get with the Detroit, but on the highway it acts a bit funny. When I am on power the locker will engage and the Jeep pulls a bit to one side, and when I let off, it pulls the other way. It's not a major pull, more like a little wiggle, but it's noticeably preasent, and you have to correct as you're driving. That's the only negative about the locker I've found.
Now with the bigger meat on the corners, I've been throwing around the idea of going to better gearing. I had 4.56's in mind as well, but some of the responses are making me consider the 4.88's...
My Cherokee will see mostly weekend 'wheelin, but I have to drive a minimum of 1.5 hours to get to decent trails. And there are also some really nice areas 4-5 hours away that I'll want to visit. I haven't considered a front locker because of the amount of highway mileage the Jeep will see.
I've heard with some lockers you have to go with manual hubs on the front to prevent it from being engaged, not sure how accurate that info actually is though???
And of course, cost is always a factor as usual. I know I need a front bumper with decent tow points before I need gears...
Anyone want to loan/give me about $5000.00 for my toys?
Failing someone being exceptionally generous, I'm going to have to wait until either late summer or fall, or maybe Christmas. But, I'll still go 'wheelin and exploring, I'll just have to have someone behind me to pull me backwards when I get stuck.
I would love to find out the ACTUAL difference in RPMs on a 4.0L with AUTO tranny.
4.56 ---> ??? RPMs at 65/70 MPH
4.88 ---> ??? RPMs as 65/70 MPH
considering that a 33 inch tire setup is used...
If its not very significant difference, I would imagine 4.88 are a lot better deal, considering:
1. overland XJ is heavier (loaded with gear / accessories)
2. might be pulling a trailer
3. heavier (beefy) tires used in comparison to smaller stock size
with those in mind, 4.88 might actually yield in a better fuel mileage as well.
Nikson
Explorer
Seems like lately I hear that more and more...
The Adam Blaster
Expedition Leader
I would love to find out the ACTUAL difference in RPMs on a 4.0L with AUTO tranny.
4.56 ---> ??? RPMs at 65/70 MPH
4.88 ---> ??? RPMs as 65/70 MPH
considering that a 33 inch tire setup is used...
If its not very significant difference, I would imagine 4.88 are a lot better deal, considering:
1. overland XJ is heavier (loaded with gear / accessories)
2. might be pulling a trailer
3. heavier (beefy) tires used in comparison to smaller stock size
with those in mind, 4.88 might actually yield in a better fuel mileage as well.
I am VERY curious as well...
I see the obvious benefit of the 4.88's offroad, but if I lose a significant amount in the fuel economy department, I wouldn't go that direction.
I did some quick math, 32/456 = 0.07
So, from 4.56's going to 4.88's you are really only increasing the numeric value by 7% of the 4.56 gear, not that large of a change at all...
I still have to wait until I have the cash anyways, so it's just academic to me at this point! lol
Black Dog
Makin' Beer.
According to this online calculator from novak, at 65 with 4.56 gears you'll have 2263 rpm whereas with 4.88 gears you be at 2422 revolutions. So basically 200 rpm difference, I kind of think the only place you'll notice it would be if you step on it to pass someone or other times like that on the highway.
Nikson
Explorer
OH,
so what the RPMs with stock XJ @ 65?
To think about it 200 extra RPMs isnt that much of an issue...even for fuel economy...
DrMoab
Explorer
This is a totally unscientific comparison. Driving habits, vehicle condition and just oddities from the factory can throw this off but its interesting anyway.
XJEEPER and I from naxja both have almost identical rigs. Both are 01s, both have 285-70-17s (his are actually 16s but they are the same height and width.
We are both lifted the same height, run the same brand of lift and otherwise are pretty close to the same.
He has 4:88s and I have 4:56s He averages 16mpg to work and back. I average 13.5 MPG.
Also he drives like a maniac and I drive like a little old lady.
DrMoab
Explorer
The 200 RPM's will actually help you compensate for the larger rolling mass and the bigger footprint in the wind.
Nikson
Explorer
I believe it goes to the same concept as I've mentioned in previous posts when I compared the 2 BMWs that I've owned...
530 (w/3.0L engine) got better gas mileage then 528 (w/2.8L engine)... Thus having a numerically higher gear ratio, puts let strain onto the engine, having it perform easier in comparison to a lower gear ration...
I think thats the idea...
Nikson
Explorer
x2
alosix
Expedition Leader
There is a limit to how far you can go though...
Back when my TJ had no OD and 33s with 4.10s it would do about 3200rpm @ 70mph.
It ATE gas. I'd probably want to keep it under 2850rpm or so for your cruising RPM. Not that I'd shoot for that number, just don't go above it.
I'm now trying to get it back into the 2500rpm or so range with the 35s and .75 OD of the stolen XJ tranny it has.
Back when my TJ had no OD and 33s with 4.10s it would do about 3200rpm @ 70mph.
It ATE gas. I'd probably want to keep it under 2850rpm or so for your cruising RPM. Not that I'd shoot for that number, just don't go above it.
I'm now trying to get it back into the 2500rpm or so range with the 35s and .75 OD of the stolen XJ tranny it has.
Nikson
Explorer
Currently with 33s & 3.55 (w/OD), I am getting roughly 200miles/gas tank. If I am pulling my sleds (trailer w/snowmobiles 2000lbs), then I am getting lots worse, and my RPM gauge is at 3000 RPM more then half of the trip.
(considering I live in NW_Oregon)