Gearing Questions
#1
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Year: 1996
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Gearing Questions
Hey guys, new here. I have a direction I think I want to go but hopefully you guys can help fill in the holes. I have a 96 XJ, 4.0 5spd. i plan to do a 6.5" IRO lift and run 33x12.50r15s with it. i will be swapping the rear for a ford 8.8 with disc brakes. I have plans to put lockers in both axles.
Now on to the unknowns: What are you guys doing with the Dana 30 up front? just beefing it up with better axles? But my biggest question has to be the correct gearing. The truck will still be driven onroad so i don't want retardedly bad fuel burn, ok more so i don't wanna be killin 4k rpm doin 65mph. That would just annoy the crap outa me. So I was thinking 3,73's but i see a lot of you guys run 4.10 and up. How do i decide what the correct gear ratio is for 33's? Thanks!
Now on to the unknowns: What are you guys doing with the Dana 30 up front? just beefing it up with better axles? But my biggest question has to be the correct gearing. The truck will still be driven onroad so i don't want retardedly bad fuel burn, ok more so i don't wanna be killin 4k rpm doin 65mph. That would just annoy the crap outa me. So I was thinking 3,73's but i see a lot of you guys run 4.10 and up. How do i decide what the correct gear ratio is for 33's? Thanks!
#2
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Year: 2001
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Engine: 4.0L I6
My buddy has 4.10's on 33's and is happy with it. I would go to 4.56's that way if I want to go up to 35's or something later, the gears are already there.
#3
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Hey guys, new here. I have a direction I think I want to go but hopefully you guys can help fill in the holes. I have a 96 XJ, 4.0 5spd. i plan to do a 6.5" IRO lift and run 33x12.50r15s with it. i will be swapping the rear for a ford 8.8 with disc brakes. I have plans to put lockers in both axles.
Now on to the unknowns: What are you guys doing with the Dana 30 up front? just beefing it up with better axles? But my biggest question has to be the correct gearing. The truck will still be driven onroad so i don't want retardedly bad fuel burn, ok more so i don't wanna be killin 4k rpm doin 65mph. That would just annoy the crap outa me. So I was thinking 3,73's but i see a lot of you guys run 4.10 and up. How do i decide what the correct gear ratio is for 33's? Thanks!
Now on to the unknowns: What are you guys doing with the Dana 30 up front? just beefing it up with better axles? But my biggest question has to be the correct gearing. The truck will still be driven onroad so i don't want retardedly bad fuel burn, ok more so i don't wanna be killin 4k rpm doin 65mph. That would just annoy the crap outa me. So I was thinking 3,73's but i see a lot of you guys run 4.10 and up. How do i decide what the correct gear ratio is for 33's? Thanks!
http://www.grimmjeeper.com/gears.html
Also, I'd suggest finding a smaller lift for 33s.
#6
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You can find 8.8's with 4.10's,disc's & a limited slip in them.
Then, look for a HP 30 from a 4 banger (4.10) & put them both in.
Cost= $300 +/-
Then, look for a HP 30 from a 4 banger (4.10) & put them both in.
Cost= $300 +/-
Last edited by Big David; 10-22-2012 at 04:25 PM.
#7
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Thanks guys, i guess now all I have to do is figure out which Transmission and transfer case i have. I think i have the AX15 but not sure yet
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#8
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Originally Posted by MslPilot
Thanks guys, i guess now all I have to do is figure out which Transmission and transfer case i have. I think i have the AX15 but not sure yet
#9
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Thanks, that's what I thought but I wanted to verify. It definatly is the AX-15. And everywhere i have looked says it should have the NP231 but i have been unable to positivly identify it by markings on the case itself.
#12
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I have 4.10s on mine with 33s, and am happy with highway driving. In 4th I do 70 at about 3000rpm. In 5th 65mph is about as slow as i like to go, it starts to bog a bit, about 2000 rpm.
I'm happy enough with 4.10s but would prefer 4.56, even on the highway. As it is now, 3000rpm in 5th would be almost 100mph. A speed I will never drive a lifted jeep. With 4.56s 3000rpm in 5th would only be 88mph. 75mph would be a comfortable 2500rpm.
3.73 would be too tall in my opinion, you would be bogging in 5th gear at any US legal speed. 75mph would be about 2000 rpm. And 3000 rpm would get you almost 110mph.
So to sum up, 4.10s are fine with 33s, but 4.56s are better. 4.10s are a little tall for 35s if you ever plan to step up tire size. 4.10s are much easier to find in the JY. 4.88s would still be quite drivable as long as long highway drives were not your norm.
I'm happy enough with 4.10s but would prefer 4.56, even on the highway. As it is now, 3000rpm in 5th would be almost 100mph. A speed I will never drive a lifted jeep. With 4.56s 3000rpm in 5th would only be 88mph. 75mph would be a comfortable 2500rpm.
3.73 would be too tall in my opinion, you would be bogging in 5th gear at any US legal speed. 75mph would be about 2000 rpm. And 3000 rpm would get you almost 110mph.
So to sum up, 4.10s are fine with 33s, but 4.56s are better. 4.10s are a little tall for 35s if you ever plan to step up tire size. 4.10s are much easier to find in the JY. 4.88s would still be quite drivable as long as long highway drives were not your norm.
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Year: 1996
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On an automatic with 33s, you want 4.56s
On a manual with 33s, you want 4.10s
That'll be a different story if you ever plan to go taller tires.
On a manual with 33s, you want 4.10s
That'll be a different story if you ever plan to go taller tires.
#15
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Yeah i was playing with that calculator and it looked like the 4.10 setup would be slightly better than stock with 33's. I think that's as big as i want to go on the XJ. Personally, i think 35's look to big with a 6.5" lift. Again, just my opinion, but I think the 33's look better and will get me where i want to go just as well as 35's.