IntrepidXJ
NAXJA Member #647
- Location
- Grand Junction, CO
jeepfreak1020 said:
I think I spent around $400-450 for the gears and master install kits....don't rememeber the exact number....and yes, that was for both front and rear (HP D30 and 8.25)
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What do you get for gas millage
- Thread starter jeepfreak1020
- Start date
I think I spent around $400-450 for the gears and master install kits....don't rememeber the exact number....and yes, that was for both front and rear (HP D30 and 8.25)
GauchoMD
NAXJA Forum User
- Location
- Santa Barbara, CA (sometimes NY)
jeepfreak1020 said:
You HAVE to run the same gear ratio front & rear... unless you never use 4wd and your front driveshaft is not attached...:roll:
- Location
- Thornton, CO
GauchoMD said:
Wrongo, you can do this all day long.
DutchVDub
NAXJA Forum User
- Location
- Milliken, CO
3.55 gears, 5spd, 4.0 HO, 32x11.5 tires and I'm averaging around 18mpg
RockyCodeHead
NAXJA Forum User
- Location
- Elizabeth, Colorado
'87 with a rebuilt Renix. 5.5" lift, 32" Mud Terrains with 3.55:1 = 13mpg on a good day.:smsoap:
That's why I'm driving my not so sexy '90 Honda Pacific Coast, 47mpg rocks!
That's why I'm driving my not so sexy '90 Honda Pacific Coast, 47mpg rocks!
Mudderoy
NAXJA Forum User
- Location
- Katy, Texas
13 mpg! I just had the O2 sensors changed, but I've been stomping on it since the 4:56 gears are broken in. I've done 125 miles on 1/2 a tank! lol
Last tank, before the O2 swap I got 235 miles which was a mix of city and highway.
We'll be taking a day trip soon. It is about 250 miles from here, so I'm looking forward to see what my highway mileage is.
See XJ specs below.
Last tank, before the O2 swap I got 235 miles which was a mix of city and highway.
We'll be taking a day trip soon. It is about 250 miles from here, so I'm looking forward to see what my highway mileage is.
See XJ specs below.
- Location
- New Mexico
15-16 '01 5" lift 33/12.5 4:56gears Auto
The weird part is get 15-16 in the city, on the highway, wheeling. It doesn't seem to matter where I am driving.
The weird part is get 15-16 in the city, on the highway, wheeling. It doesn't seem to matter where I am driving.
- Location
- Colorado Springs, CO
I've got 3 different 4.0's, and they all get different mileage.
90 XJ: I've owned this for 16 years, and have kept track of mileage from the beginning. Around town in the summer it got 16 mpg, in the winter with oxygenated fuels, it got 14-15. This is with the 5 spd and stock everything. On the highway when the speed limit was 55, I managed 22 mpg once, and 20-21 mpg occasionally. One summer pulling a trailer in the mtns with the family aboard and 3" lift with 30's, 3.55's, I got 20 mpg. The latest highway mpg commuting to South Denver at 75-85 mph with 3+ lift, 31" tires, and 4.11 gears; good tune up; rebuilt, balanced fuel injectors; Mike Leach/Mopar header with ceramic coating and custom exhaust; home made Cold air intake, I average about 15 mpg. It has 150k miles on it, bad blow by, and one cylinder with bad valves, based on a low compression ratio that wouldn't come up with oil squirted in.
88 MJ: I really haven't driven this all that much. It has a 5 spd, and everything is pretty much stock. At 170k miles, it gets 16-18 mpg regardless of city or highway.
99 WJ: With the distributer less ignition, and a K+N filter, and an auto, it manages close to 20 mpg commuting to S. Denver at 80 mph with the air conditioning on. The air conditioner doesn't seem to make much difference as far as mpg goes. If it hadn't been built by Chrysler, this could have been an exceptional vehicle.
Fred
90 XJ: I've owned this for 16 years, and have kept track of mileage from the beginning. Around town in the summer it got 16 mpg, in the winter with oxygenated fuels, it got 14-15. This is with the 5 spd and stock everything. On the highway when the speed limit was 55, I managed 22 mpg once, and 20-21 mpg occasionally. One summer pulling a trailer in the mtns with the family aboard and 3" lift with 30's, 3.55's, I got 20 mpg. The latest highway mpg commuting to South Denver at 75-85 mph with 3+ lift, 31" tires, and 4.11 gears; good tune up; rebuilt, balanced fuel injectors; Mike Leach/Mopar header with ceramic coating and custom exhaust; home made Cold air intake, I average about 15 mpg. It has 150k miles on it, bad blow by, and one cylinder with bad valves, based on a low compression ratio that wouldn't come up with oil squirted in.
88 MJ: I really haven't driven this all that much. It has a 5 spd, and everything is pretty much stock. At 170k miles, it gets 16-18 mpg regardless of city or highway.
99 WJ: With the distributer less ignition, and a K+N filter, and an auto, it manages close to 20 mpg commuting to S. Denver at 80 mph with the air conditioning on. The air conditioner doesn't seem to make much difference as far as mpg goes. If it hadn't been built by Chrysler, this could have been an exceptional vehicle.
Fred
Mudderoy
NAXJA Forum User
- Location
- Katy, Texas
4:56 gears broke in, driving like a bat out of hell, or an a$$hole with a new beamer for the last 15 gallons of gas, 12 mpg.
Top speed with new gears reached, so far, 95 mph
Top speed with new gears reached, so far, 95 mph
Skwerly
NAXJA Forum User
- Location
- Ash Fork, AZ (Freedom)
To figure out what gears will be best for your setup, use this formula:
the NEW or DESIRED tire size, divided by the OLD tire size (In my case it was 33 divided by 26).
Now take that #, and multiply it by your CURRENT gear ratio, for me it was 3.55. This netted 4.5057 for me personally, so the best gear ratio available for 33's on my rig is 4.56. This formula works at all times.
the NEW or DESIRED tire size, divided by the OLD tire size (In my case it was 33 divided by 26).
Now take that #, and multiply it by your CURRENT gear ratio, for me it was 3.55. This netted 4.5057 for me personally, so the best gear ratio available for 33's on my rig is 4.56. This formula works at all times.
jeepfreak1020
NAXJA Forum User
- Location
- Thornton
Skwerly said:
Well im sticking with the size tires i have. I have 32 11.50. And im running stock gear ratio. So what numbers should i use then?
Skwerly
NAXJA Forum User
- Location
- Ash Fork, AZ (Freedom)
If you are sticking with that combo, you won't need the numbers hahaha. That's only for if yer gonna change it!
Mudderoy
NAXJA Forum User
- Location
- Katy, Texas
jeepfreak1020 said:
4.2074074074074074074074074074074 (Based on 32" from 27" tire size)
DutchVDub
NAXJA Forum User
- Location
- Milliken, CO
Then you need to decide what you want, a 4.10 will be closer to stock than a 4.56. However if you ever decide to go up to 35's you'll be doing another gear swap. On my automatic equipped 99 XJ I was planning on running 4.56's. I figured it weould be better to be over geared than under, plus I wouldn't have to change anything when going to 35's.
hightimes2
NAXJA Forum User
- Location
- Littleton, CO
When I had my XJ I got 19-20 mpg when I took it to moab and grand junction a few diff. times and around 15 normal city driving. This was in a 88 with 37" mtrs and 4.56 gears
jeepfreak1020
NAXJA Forum User
- Location
- Thornton
DutchVDub said:
Ya thats true, i would rather be over geared.
- Location
- Golden, CO
19 MPG city/highway combined.
'90, Auto, 3.55 gears, 235/75/15 tires, high altitude CPS, new exhaust manifold.
Put on 31s to drive over Saxon for Father's day, 12.5 MPG.
'90, Auto, 3.55 gears, 235/75/15 tires, high altitude CPS, new exhaust manifold.
Put on 31s to drive over Saxon for Father's day, 12.5 MPG.
YELLAHEEP
NAXJA Forum User
- Location
- Littleton, Colorado
Well, the 2nd full tank has been consumed on the '96.
This time I put in 14.5 gallons, drove 205 miles = 14.3 MPG. A little worse than the 15 mpg I got last tank, but the misfire condition was much worse toward the end.
I pulled the plugs.... so worn out that they had larger than a .055 gap! I replaced the plugs, wires, cap and rotor today and then went and had a muffler shop replicate a cat-back exhaust. I had 'em copy the Rusty's cat-back design using an 18" glass pack. It sure sounds better anyway.
Then I filled the tank again.
It'll be interesting to see if the tune up and/or the exhaust helps in the MPG results after this tank.
Still gotta do the gears.
This time I put in 14.5 gallons, drove 205 miles = 14.3 MPG. A little worse than the 15 mpg I got last tank, but the misfire condition was much worse toward the end.
I pulled the plugs.... so worn out that they had larger than a .055 gap! I replaced the plugs, wires, cap and rotor today and then went and had a muffler shop replicate a cat-back exhaust. I had 'em copy the Rusty's cat-back design using an 18" glass pack. It sure sounds better anyway.
Then I filled the tank again.
It'll be interesting to see if the tune up and/or the exhaust helps in the MPG results after this tank.
Still gotta do the gears.
Last edited:
Mudderoy
NAXJA Forum User
- Location
- Katy, Texas
Drove from Houston to Central Texas Sunday.
I was surprised to see that I was getting 14 mpg on the highway with cruise control on. I was driving 75 miles per hour and 3000 rpm.
2nd tank was 14 mpg.
3rd tank was 16.8 mpg! This is the best mileage I have had since I started measuring the mpg. This was on the way home. It was dark and got cooler as we drove back to Houston. I drove back at exactly 65 mph and 2400 rpm. I still have a problem, I just have to find it.
I was surprised to see that I was getting 14 mpg on the highway with cruise control on. I was driving 75 miles per hour and 3000 rpm.
2nd tank was 14 mpg.
3rd tank was 16.8 mpg! This is the best mileage I have had since I started measuring the mpg. This was on the way home. It was dark and got cooler as we drove back to Houston. I drove back at exactly 65 mph and 2400 rpm. I still have a problem, I just have to find it.
