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Old 04-18-2013, 07:37 PM   #31
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Originally Posted by Shark_13 View Post

D35 will push 35" tires to the mall & back no problem....
I guess.... but the OP stated "to be able to drive at least 65MPH consistently"

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Old 04-18-2013, 11:09 PM   #32
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Lot's of ideas of fixing the problem. My question is, and I may get slammed for asking, why do you want to go over 65? Our maximum speed here is 110km/hr which is about the same as your 65m/hr. And that speed in only on divided highways.
Like he said,
My 2.5 runs 33s at 67-75 mph In 4th around 3,000 rpm. I would just do that with yours too. Doesn't hurt anything... I never use 5th

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Old 04-18-2013, 11:18 PM   #33
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There are many places across the US that the interstate max speed is 70mph.
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Old 04-19-2013, 02:05 AM   #34
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What should the gear ratio be for a 4.0 auto w- 33's?
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Old 04-19-2013, 05:18 AM   #35
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What should the gear ratio be for a 4.0 auto w- 33's?
4.10's with a 3 speed auto
4.56's with a 4 speed auto
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Old 04-19-2013, 05:36 AM   #36
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Originally Posted by jeepsrgreat View Post
Lot's of ideas of fixing the problem. My question is, and I may get slammed for asking, why do you want to go over 65? Our maximum speed here is 110km/hr which is about the same as your 65m/hr. And that speed in only on divided highways.
Not sure where you are located but in the US speed limits vary across the country. Many are indeed 55-65 but a lot are 70 and now even higher. With that said, the normal traffic flow moves at 70-75 on most roads. Even at 80, you are not passing a lot of people. I normally drive my daily driver TJ at 75+ on my commute.
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Old 04-19-2013, 06:13 AM   #37
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I have a 97' Sahara with 5spd and 31's and it takes a act of congress to keep 70 on the highway. In 4th gear doing 65mph I'm running about 2400 Rpms so If my calculations are right I should have 3.55? No tag on either diff. Not trying to steal the thread but I'm having the same problem. :-/
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Old 04-19-2013, 03:12 PM   #38
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I have a 97' Sahara with 5spd and 31's and it takes a act of congress to keep 70 on the highway. In 4th gear doing 65mph I'm running about 2400 Rpms so If my calculations are right I should have 3.55? No tag on either diff. Not trying to steal the thread but I'm having the same problem. :-/
If you don't know what gear ratio and there is no tag on your axle then you can request a build sheet from chrysler. I emailed
customerassist@chrysler.com gave them Vin and owner info they sent me the following. In there it shows the gear ratio that came with the jeep from factory.

Vehicle Description JEEP WRANGLER RUBICON 4X4 SPORT UTILITY 2-DR
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Old 04-19-2013, 03:25 PM   #39
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Not sure where you are located but in the US speed limits vary across the country. Many are indeed 55-65 but a lot are 70 and now even higher. With that said, the normal traffic flow moves at 70-75 on most roads. Even at 80, you are not passing a lot of people. I normally drive my daily driver TJ at 75+ on my commute.
Lol, ya. I can't imagine only being able to go 65. I consistently hit the limiter on road trips...
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Old 04-19-2013, 03:54 PM   #40
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Hi everyone, new member and new Jeep owner. I just bought a '98 TJ 4.0L 5 speed. Jeep has 200K mi. on it but appears well kept and runs good. The only problem I notice is that at 5th gear I can't go 65mph or higher. tires are 35x13.50x15 not sure what gears it has. Is there anything I can do to be able to drive at least 65MPH consistently?.

Thanks
I would start by checking simple things first before you go off and spend large amounts of money changing gears. First check the Spark Plugs and there GAP 0.35 is the correct. check the wires and CAP and ROTOR. if there is corrosion on terminals that can make for weak spark and not a complete burn. Second thing to check is the fuel pressure I think it should be around 50 PSI at the RAIL.

I ran 33 with 4.10 gears on my 99 tj with a 4cyl and can do 75 without issue. I can't imagine you can't do 65 with a 4.0L
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Old 04-19-2013, 05:31 PM   #41
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Originally Posted by jeepndon View Post
I ran 33 with 4.10 gears on my 99 tj with a 4cyl and can do 75 without issue. I can't imagine you can't do 65 with a 4.0L
I ran 33's with 4.10 gearing for several years & could barely do 75 with my 4.0L. I can't imagine being able to do 75 with the 2.5L and that combination without issue.
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Old 04-19-2013, 06:00 PM   #42
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4.10's with a 3 speed auto
4.56's with a 4 speed auto
Thanks chief. Need to tear her apart still to see what I'm running. Jw cause I saw the topic but I'm doing well over 70.
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Old 04-19-2013, 08:02 PM   #43
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Not sure where you are located but in the US speed limits vary across the country. Many are indeed 55-65 but a lot are 70 and now even higher. With that said, the normal traffic flow moves at 70-75 on most roads. Even at 80, you are not passing a lot of people. I normally drive my daily driver TJ at 75+ on my commute.
This, plus you need passing power. People drive 75+ in MN metro area. I have heard around Vegas is even worse.
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Old 04-19-2013, 11:26 PM   #44
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I ran 33's with 4.10 gearing for several years & could barely do 75 with my 4.0L. I can't imagine being able to do 75 with the 2.5L and that combination without issue.
Drove it to work everyday as long as it is flat I had no problem with 70 75 about 2800 to 2900 RPM if a hill came up I lost 10 to 20 MPH. I currently have the Rubicon 4.0L with 4.10 and 33" tires I can do 75 all day long hell I can do 80 without a problem. Oh and I am in Denver CO. I can also get 18.5 MPG if I do 60 -65 MPH people can't believe that either but its true. And yes my Speedo is dead on 65MPH is 65 on the GPS.
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Old 04-30-2013, 04:27 PM   #45
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Originally Posted by jeepsrgreat View Post
Lot's of ideas of fixing the problem. My question is, and I may get slammed for asking, why do you want to go over 65? Our maximum speed here is 110km/hr which is about the same as your 65m/hr. And that speed in only on divided highways.
Because even Big rigs go over 65mph. I don't like being passed by one. It's scary.
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Old 04-30-2013, 05:04 PM   #46
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This, plus you need passing power. People drive 75+ in MN metro area. I have heard around Vegas is even worse.

I was playing with a Nissan GTR from Barstow to Vegas on I-15 doing up to 170mph. Probably 120 on average, majority of traffic flow was easily 90mph. Blew just about a whole tank of gas in 150mi; 10mpg
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Old 04-30-2013, 05:21 PM   #47
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Lol, ya. I can't imagine only being able to go 65. I consistently hit the limiter on road trips...
Have had my TJ for two years now an have NEVER hit 70mph, not even once. I just see no need. My commute is rural roads, but even on the hwy I only ride at 60 or so with the rare 64-65. Sure on the highway everyone is passing me, so what? Who says its wrong to get passed?

Just cause a Jeep can go 80+ doesn't mean it should. A gust of wind on a TJ doing 80 could be so much more hard to handle than a car doing the same speed.

Besides, going 60 max, you will get several mpg better. I routinely get 19mpg, not hard to do when you don't speed.
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Old 04-30-2013, 07:30 PM   #48
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Have had my TJ for two years now an have NEVER hit 70mph, not even once. I just see no need. My commute is rural roads, but even on the hwy I only ride at 60 or so with the rare 64-65. Sure on the highway everyone is passing me, so what? Who says its wrong to get passed?

Just cause a Jeep can go 80+ doesn't mean it should. A gust of wind on a TJ doing 80 could be so much more hard to handle than a car doing the same speed.

Besides, going 60 max, you will get several mpg better. I routinely get 19mpg, not hard to do when you don't speed.

We'll see how it goes once I fit a larger lift with all new control arms and tires, as is with 31's ATs and HD springs I'm completely comfortable at 80+, though you can really feel the wall of air you're pushing up front. The handling is actually quite good, IMO, and largely (I think) due to the relatively poor off-road characteristics of the stock rubber bushings that keep everything locked down with minimal play. I don't have a top on my jeep, so the side profile is minimal, too. It seems to squirm less in the wind and track better than my old Acura Integra death box.
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Old 05-01-2013, 09:01 AM   #49
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We'll see how it goes once I fit a larger lift with all new control arms and tires, as is with 31's ATs and HD springs I'm completely comfortable at 80+, though you can really feel the wall of air you're pushing up front. The handling is actually quite good, IMO, and largely (I think) due to the relatively poor off-road characteristics of the stock rubber bushings that keep everything locked down with minimal play. I don't have a top on my jeep, so the side profile is minimal, too. It seems to squirm less in the wind and track better than my old Acura Integra death box.
Yes they drive pretty good driving along at 80+mph right up to that point where someone comes across three lanes on you and you try to take evassive action.......post up how it went from the ER.....if they even bother taking you there.
Use common sense Jeepers Short Wheel Base Hi Center of Gravity Suspension Geometry not designed for slot car racing....keep the speeds down to where you have a chance if something Unexpected happens.
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Old 05-01-2013, 09:32 AM   #50
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I guess I am getting old, but I only did 80-85 on the freeway once, I was fine and didn't even notice until someone flew past me and I looked at the speedometer to get an idea how fast he was going. My commute is on all county roads with 45 mph speed limits anyway so I don't get that opportunity often. Not really in that much of a rush anymore either.
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Old 05-01-2013, 02:19 PM   #51
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Max speed limit around here is 75, w people driving 80-90 avg. Some of u guys suggest he get lower gears but how is that going to help w his top speed. Acceleration yes, top speed, doubtful.. especially if he can't go over 65 now with a 6 cylinder.
Running 31's on 4 cylinder and 4.11, I can cruise at 90mph if needed with a slight slow down up hill. Regardless of his gearing, shouldn't there be enough power to push his jeep faster than 65mph? If his gearing was super low, he would have no top speed but quick acceleration. I use to do this w my crotch rocket to make it a wheelie bike. I would go through gears quick w no top speed....
You guys don't think there is a power issue somewhere??? Motor has 200,000 miles. Doesn't sound like it was rebuilt.
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Old 05-01-2013, 04:49 PM   #52
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Max speed limit around here is 75, w people driving 80-90 avg. Some of u guys suggest he get lower gears but how is that going to help w his top speed. Acceleration yes, top speed, doubtful.. especially if he can't go over 65 now with a 6 cylinder.
Running 31's on 4 cylinder and 4.11, I can cruise at 90mph if needed with a slight slow down up hill. Regardless of his gearing, shouldn't there be enough power to push his jeep faster than 65mph? If his gearing was super low, he would have no top speed but quick acceleration. I use to do this w my crotch rocket to make it a wheelie bike. I would go through gears quick w no top speed....
You guys don't think there is a power issue somewhere??? Motor has 200,000 miles. Doesn't sound like it was rebuilt.
My bet is the engine makes significantly less power than it did originally. He should be able to push past that speed no problem.
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Old 05-12-2013, 09:05 AM   #53
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My bet is the engine makes significantly less power than it did originally. He should be able to push past that speed no problem.
On 33"s?

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