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Old 08-25-2013, 07:19 PM   #31
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2000 tj
4.0
4:10 gearing
Nv3550 5 speed
35x12.50 r 15
I do around 2k at 60mph


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Old 08-25-2013, 07:45 PM   #32
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05
Auto
33x12.5


I'm running around 2000

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Old 08-25-2013, 08:40 PM   #33
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99 sport
5 speed
33x12.5
4.10 gears

I run around 2100 at 60 mph but I wish I had gone 4.56
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Old 08-26-2013, 12:10 AM   #34
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2002 Sport
NV3550
5 speed
30X9.5
3.73

I turn ~2K RPM at 60 MPH; it's a tad sluggish on the hills and merging with screemingeemies on the I-ways but has plenty of oomph for my needs, and gets fair to middlin' mileage. I track my mileage and average 17+/- MPG (mixed driving)/18+ highway, and have gotten an insane almost 22 MPG (strictly highway but anything over 19 is remarkable). FWIW, I get my best mileage using cruise control (except in very hilly or mountainous terrain. YMMV, and invariably will...
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Old 08-26-2013, 08:04 AM   #35
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Quote:
Originally Posted by gregsjeep13 View Post
I would imagine your 99 would not be much different than my 97. I want to re-gear but I am a little nervous to go to 4.56 and have highway miles at high rpm's. The 4.56 sounds like the way to go, from what I've read. Where are your rpm's when going 75 mph in 5th gear?
I don't recall off the top of my head, mileage drops significantly at that speed so I don't go there much. Next time I'm on the highway I'll check and get back to you. Rough guess would be around 2600 to 2700. Engine would be in the power band, but then you're fighting aerodynamics.
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Old 08-26-2013, 09:23 AM   #36
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Quote:
Originally Posted by gregsjeep13 View Post
I would imagine your 99 would not be much different than my 97. I want to re-gear but I am a little nervous to go to 4.56 and have highway miles at high rpm's. The 4.56 sounds like the way to go, from what I've read. Where are your rpm's when going 75 mph in 5th gear?
Just to jump in here, I wish a 4.33 was availible for this very reason.
With my 03 TJ 5spd 33 4.56 combo the engines zinging along pretty good at 70mph.
Thankfully I don't have to do any highway driving at 70-75mph with it, if I did I'd probably went with a 4.10.
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Old 08-26-2013, 10:24 AM   #37
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Till you came to the first big hill or stiff headwind.
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Old 08-26-2013, 12:01 PM   #38
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No doubt that my mpg suffers greatly above 70 mph.. the sweet spot is between 65-70 mph. I runs a low enough revs and doesnt have to fight the air so much either.
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Old 08-26-2013, 03:15 PM   #39
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Quote:
Originally Posted by flflash View Post
Just to jump in here, I wish a 4.33 was availible for this very reason.
With my 03 TJ 5spd 33 4.56 combo the engines zinging along pretty good at 70mph.
Thankfully I don't have to do any highway driving at 70-75mph with it, if I did I'd probably went with a 4.10.
Next time you get out on the highway I would be interested in your RPM's in 5th going 75.

I do mostly back roads on my way to work but me and my wife like to do trips and I want to get a feel for what highway rpm's would be like for for hours of driving. Just trips trips to upstate NY (where she is from) are 6 hours.
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Old 08-26-2013, 03:23 PM   #40
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Quote:
Originally Posted by flflash View Post
2003 TJ
4.0
5 speed manual
33 BFG KTM's
4.56 gears
2600 RPM in 5th @ 60mph

Plenty of power and acceleration both on road and off road. I still get 15-16 with a heavier than stock TJ ( big bumpers, tire carrier, skid plates, rock rails, winch, tools, spare parts and heavy right foot ) Very Happy with it.
Quote:
Originally Posted by gregsjeep13 View Post
Next time you get out on the highway I would be interested in your RPM's in 5th going 75.

I do mostly back roads on my way to work but me and my wife like to do trips and I want to get a feel for what highway rpm's would be like for for hours of driving. Just trips trips to upstate NY (where she is from) are 6 hours.
I'll try but where I live in Central Florida it's a challenge getting up to 60 without running over a Retiree or a Tourist.
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Old 08-26-2013, 07:47 PM   #41
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This is very informative. It looks like 4.11 gears would work best for a 4.0L with auto trans, lock up converter = 1.1 ratio output @ trans, and lower 4.56 would seem to work best with a manual 5 or 6 speed with O/D since the od is like a .08 to 1 output at trans. happy campers here like 2450+ RPM= good power/milage. Thanks for all the replies. I was thinking about swapping to 3.73 gears, which would work ok in mine w/31s and auto trans. But now I am convinced 4.11 would be closer to ideal.
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Old 08-26-2013, 09:23 PM   #42
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05' LJ
4.0L
33x10.5"(for DD use......run 35x10.5" off road)
6 speed NSG370
4.88 gearing
Around 2600-2800 in 6th from 60-65mph
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Old 08-27-2013, 11:21 PM   #43
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97 TJ
4.0L
33x12.5x15
5 speed
3.07 ratio
2100ish at 65 in 4th

I only use 5th on flats to hold about 65 mph. The second I hit a hill I downshift to 4th and I find that to be sufficient for my needs. I would really like to regear though, it could be a much better drive if I even had 3.73 let alone > 4.

Newbie question: how much $$ are we talking to regear?
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Old 08-27-2013, 11:38 PM   #44
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I posted earlier but I decided to double check my rpm, got different results:

2001 TJ
4.0L
31x10.5R15
5 speed
3.73 gear ratio
1800 rpm @ 5th gear at 62mph or 100kph

Originally I thought was was at 2200rpm at that speed but its been a while since I've bothered keeping track/driving at that speed. Am I doing alright for my results?
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Old 08-27-2013, 11:45 PM   #45
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Quote:
Originally Posted by RevCo666 View Post
I posted earlier but I decided to double check my rpm, got different results:

2001 TJ
4.0L
31x10.5R15
5 speed
3.73 gear ratio
1800 rpm @ 5th gear at 62mph or 100kph

Originally I thought was was at 2200rpm at that speed but its been a while since I've bothered keeping track/driving at that speed. Am I doing alright for my results?
Yours is same as mine. I want to go to 4.11. It lacks power with my weight. Bumpers winch hard top roof rack etc. I'm in a hilly area of Missouri I use 4th all the time with better MPG. Can't wait to use that extra gear again. Might be different in a planes state.
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Old 08-27-2013, 11:51 PM   #46
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Yours is same as mine. I want to go to 4.11. It lacks power with my weight. Bumpers winch hard top roof rack etc. I'm in a hilly area of Missouri I use 4th all the time with better MPG. Can't wait to use that extra gear again. Might be different in a planes state.
I'm as stock as you can get, only the tires aren't... So I have no issues with being weighed down... Would that differ then? I have no intentions of regearing, I figure I should be good where I'm at...
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Old 08-28-2013, 12:47 AM   #47
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Quote:
Originally Posted by RevCo666 View Post

I'm as stock as you can get, only the tires aren't... So I have no issues with being weighed down... Would that differ then? I have no intentions of regearing, I figure I should be good where I'm at...
You should be ok. I lifted mine 3 inches and put the 31's on. It decent until I started piling on weight. Now a slightest hill on the highway and I would be downshifting to 4th. Then I started realizing I had to give less gas to maintain speed in 4th. I don't use 5th any more and get better mpg. I plan on getting 32s next as well. Try driving in 4th see what it does for you. It may improve mileage. Our 4th gear is the same as 3rd in an auto so don't worry about over revving Etc. those gearing charts say you would benefit from 4.11.
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Old 08-28-2013, 01:00 AM   #48
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You should be ok. I lifted mine 3 inches and put the 31's on. It decent until I started piling on weight. Now a slightest hill on the highway and I would be downshifting to 4th. Then I started realizing I had to give less gas to maintain speed in 4th. I don't use 5th any more and get better mpg. I plan on getting 32s next as well. Try driving in 4th see what it does for you. It may improve mileage. Our 4th gear is the same as 3rd in an auto so don't worry about over revving Etc. those gearing charts say you would benefit from 4.11.
Cool, thanks for the confirmation. I guess you can tell I'm not super technical on mechanics but definately learning alot in my first year in with my jeep
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Old 08-28-2013, 08:22 AM   #49
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4.0 auto 3.73 33 mtrs

1800 at 60
2000 at 65
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Old 08-28-2013, 08:46 AM   #50
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2006 tj rubicon

4.0L
Axle ratio 4.10
245/75r16 (31x10)
Mpg 15city-20.

2300rpm at 60
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Old 08-28-2013, 09:13 AM   #51
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3 speed auto, 2001 TJ
60 mph
2100 rpm
30" tires
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Old 08-28-2013, 09:19 AM   #52
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I got a chance yesterday to run it up to about 75, and the engine rpms were 3000 in 4th, and about 2500 in 5th.

I didn't stay there long given the price of gas around here.
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Old 08-28-2013, 05:19 PM   #53
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I got a chance yesterday to run it up to about 75, and the engine rpms were 3000 in 4th, and about 2500 in 5th.

I didn't stay there long given the price of gas around here.
That seems pretty good, maybe a little low in rpm's but I wonder how much different 4.56 gears would jump that up. Thanks for checking on that. I hope someone that has 4.56 gears with a similar setup will post their results for comparison.
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Old 08-28-2013, 05:25 PM   #54
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7.0L
4sp Auto
4.10 gear
about 1,800 @ 60
about 2,500 @ 80
about 3,000 @ 100

That last one is a calculation the link below is handy
Gear Ratio Speed Calculator
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Old 08-28-2013, 05:30 PM   #55
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7.0L
4sp Auto
4.10 gear
about 1,800 @ 60
about 2,500 @ 80
about 3,000 @ 100

That last one is a calculation the link below is handy
Gear Ratio Speed Calculator
7.0l engine?
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Old 08-28-2013, 05:32 PM   #56
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Old 08-28-2013, 05:56 PM   #57
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I just took mine out and I was at 2800 in 4th at 75 mph and 2300 in 5th at 75 mph. My speed was measured by Garmin since I have not replaced the speedo gear yet. Seems like there is about 2 to 3 hundred rpms different between your 4.10's and my 3.55 so I am guessing that 4.56 gears at 75 mph would be around 3300 in 4th and 2800 in 5th?? Would it hurt to run 75 at 2800 for long periods of time (say 6-8 hours) with a couple of stops?
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Old 08-28-2013, 08:08 PM   #58
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Wouldn't hurt the engine to run at 3300 rpm for 6-8 hours. The 4.0 has some beefy main bearings, and it's a stout engine.
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Old 08-28-2013, 08:41 PM   #59
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1900 RPM at 60 mph
33x12.50x15
4" frankenstein lift
factory 3.55's
138k miles
best mpg I got was all highway (fill up to fill up) with no A/C, windows up, light on the pedal -20mpg
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Old 08-29-2013, 06:08 PM   #60
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2001 sport
5 speed
3.73 Dana 44
Stock 15 tires

I was actually measuring this on my way to work this morning. I'm at about 2000 to 2100 rpm at 60 in 5th.

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