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Old 02-18-2012, 06:00 PM   #1
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Newb question

Hey folks,

Just bought a 2000 Wrangler that I've wanted for a long time and I'm really happy with it except for one thing. I can't get it to go over 60-65 mph on the freeway. Is that normal?

It's the straight six so I'd think there should be a little more gumption. What should I be looking at to fix this?

Thanks for your input.

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Old 02-18-2012, 06:13 PM   #2
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no thats not normal. unless youve got 35s and 3.07s.

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Old 02-18-2012, 06:15 PM   #3
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We need more info. Larger than stock tires with stock gears is likely the problem.
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Old 02-18-2012, 06:15 PM   #4
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It should go way faster than that! Not sure where to begin.

Parking brake stuck, clogged fuel filter, someone put a chip in it with a speed limiter, clogged cat.....?

Can you tell us how it feels? Does it seem to accelerate and then just loose steam, or is it generally sluggish?
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Old 02-18-2012, 06:19 PM   #5
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Confused by the gear issue. Larger tires and a 3.07 gear ratio should net a higher top speed, just take longer to get there. Smaller tires and 4.10s would give you much better acceleration but a lower top end.

What am I missing?
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Old 02-18-2012, 06:34 PM   #6
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Gears 1-3 seem absolutely normal. 4-5 just have no power at all. It's got 33 in. tires. When I drove it home my first thought was that it was governed like a golf cart. There's lots of play in the gas pedal in 4th and fifth but the rpms stay pretty static even if I push it to the floor.

BTW I'm very happy to hear that it's not normal.
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Old 02-18-2012, 06:39 PM   #7
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I've got 32s with stock gears, and I can't get much more then 70 unless I'm going downhill. So 33s and stock gears at 60-65 probably isn't completely unreasonable.

However-

Did the jeep come with the 33s on it? It may be that the speedo wasn't adjusted for the new tires, and so it isn't accurate
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Old 02-18-2012, 06:41 PM   #8
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It's normal with 3.07 and 33". That final drive ratio of 4th (1:1) and fifth (.86:1) just can't turn those tires at that speed. There's just no torque at 2000 rpm to turn those tires
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Old 02-18-2012, 06:44 PM   #9
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Quote:
Originally Posted by c_goodnow
I've got 32s with stock gears, and I can't get much more then 70 unless I'm going downhill. So 33s and stock gears at 60-65 probably isn't completely unreasonable.

However-

Did the jeep come with the 33s on it? It may be that the speedo wasn't adjusted for the new tires, and so it isn't accurate
So true... Mine read 50 when I was doing 60 on the highway. Couldn't believe I was that slow, but gps showed me the truth.
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Old 02-18-2012, 06:58 PM   #10
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Thanks for the info. I'm sure that the speedo wasn't adjusted because I was fine with the flow of traffic. Any tips for where to look for regearing for those tires? I'll search the forums but I want to know what to expect in terms of cost or labor.

And again thanks for the quick replys it's nice to find a good community with knowledgeable members willing to help.
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Old 02-18-2012, 07:05 PM   #11
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You just opened pandoras box by asking that question... Lol

Bare bones you are 600ish for gears, 800ish to get installed (front and rear, you have to do both to match) you can reduce that by finding used gears in the 4.10 or 4.56 ratio (4.10 is easier because they are a stock factory gear)

But some will spend your money in one quick sentence on here and tell you that you need 5000+ in new axles, gears, and brakes.

Read up, tons of threads on it.
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Old 02-18-2012, 07:31 PM   #12
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Quote:
Originally Posted by Kevbz
It's normal with 3.07 and 33". That final drive ratio of 4th (1:1) and fifth (.86:1) just can't turn those tires at that speed. There's just no torque at 2000 rpm to turn those tires
I had the same problem with my '98. Same tire/gear configuration. Here is what I did (and still do)

First, I did a complete tune up on it. INCLUDING the FUEL FILTER!!! On my jeep, the fuel filter is located on top of the fuel pump so you'll have to drop the tank to access it. Add a bottle if injector cleaner into the fuel tank before your next few fill-ups. Second, on the highway (under 60) I never take it out of 4th gear. Third, for the next month or so, make sure you really stomp on the gas pedal getting out onto the highway. You never know how the other owner used to drive it. Sludge can build-up in the fuel system and make it sluggish under load. Revving it out with your foot to the floor can help blow it out. Just keep it under 5000 RPM! Lol

After all that, if you still have problems, try advancing the timing a little bit ( if there is an adjustment on that model year)

My TJ runs a lot better now and I now have enough power to accelerate in 5th gear at 1800 RPM. But if you have the money, go for the gears too.
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Old 02-18-2012, 08:05 PM   #13
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Thanks for the tips. I think I'll do the regearing myself and I'll clean the fuel system as well as I can.
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Old 02-18-2012, 08:30 PM   #14
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I have 31's on 3:07 gears and it can be quite sluggish on the interstate. I wouldn't even want to know what 33's felt like in 5th gear. I have been going over the same questions that you have. After researching a while I have decided to save the 600-800$ to regear my 35 and put an 8.8 in its place instead.
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Old 02-18-2012, 08:36 PM   #15
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there is something way wrang, my 4.0 5speed can do 100mph on 33s and stock gearing if i wanted to and have, my jeep sees 85mph, almost every mourning when im late for work lol, i recently drove back from denver to my town , 400 mile drive , my jeep hit 90mph half the trip, and that wasent even mashing the throttle, my only mods are airaid intake, and free flow cat, im guessing your jeep has a wickedly clogged cat, possibly bad fuel, mud crusted air filter, IMO with a 5speed 4.0 33s you dont need gearing, i daily drive my jeep on 33s and stock gearing it feels fine, but then again my jeep breaths and exhale's better then most.
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Old 02-18-2012, 08:44 PM   #16
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Originally Posted by baerbonesjones View Post
there is something way wrang, my 4.0 5speed can do 100mph on 33s and stock gearing if i wanted to and have, my jeep sees 85mph, almost every mourning when im late for work lol, i recently drove back from denver to my town , 400 mile drive , my jeep hit 90mph half the trip, and that wasent even mashing the throttle, my only mods are airaid intake, and free flow cat, im guessing your jeep has a wickedly clogged cat, possibly bad fuel, mud crusted air filter, IMO with a 5speed 4.0 33s you dont need gearing, i daily drive my jeep on 33s and stock gearing it feels fine, but then again my jeep breaths and exhale's better then most.
3:07 or 3:73?
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Old 02-18-2012, 08:53 PM   #17
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im guessing 3:73's? im not sure
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Old 02-18-2012, 08:54 PM   #18
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im guessing 3:73's? im not sure
how would i check besides pulling the diff covers
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Old 02-18-2012, 09:06 PM   #19
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I install lift kit rough country 3.25" and I have problem whit my gears they kick back what I can do
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Old 02-18-2012, 09:12 PM   #20
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I install lift kit rough country 3.25" and I have problem whit my gears how I can fix my gears kick back
what?
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Old 02-18-2012, 09:37 PM   #21
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Quote:
Originally Posted by baerbonesjones View Post
how would i check besides pulling the diff covers
1) Jack up ONE tire enough so that you can spin it by hand
2) Mark the tire & spin it TWO complete revolutions &
3) Count the number of revolutions of the drive shaft

It's not scientific but you don't have to take off diff covers
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Old 02-18-2012, 11:02 PM   #22
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Air filter appears brand new. I'll change the rest of the filters when I tune it up.
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Old 02-18-2012, 11:08 PM   #23
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Originally Posted by CadmusII View Post
I can't get it to go over 60-65 mph on the freeway. Is that normal?
Not normal, at least in my limited experience,

My 2001/6cyl/auto/with 32s & 3.07 gears, has no problem maintaining any posted speed limit with or without hills.
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Old 02-19-2012, 05:51 AM   #24
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Auto with 3.07 and 32's is going to be quite different than a 5 speed with 3.07s and 33's. You can check your axel for a metal tag that will tell you the ratio if it is still there. On mine the tag on the rear axel is gone but is still there for the front. I have 35's and 3.73's and she is fine up to about 60 and I can make it to 70 after a bit, but she doesn't have much more in her. And forget about 5th gear with my setup. I know I need to regear mine but I am saving up money to do 4.88's and ARB's front and rear.

Now if your pretty sure that the speedo gear hasn't been changed, find your axel ratio by the tag method above or the tire spin method above. Then order the correct speedo gear, should be less than $25. It will take you about 5 min to swap.

After you verify what your correct speed is, if you feel that it is still under powered, start with a basic tune up (should be done when you first buy a used vehicle IMO) the check your fuel and exaust systems. Once you know that your Jeep is running correctly think about gears. I believe that you will get to where you want to swap them anyway but I would hate for you to throw money into gears and leave a basic problem undiagnosed then be short on repair funds after the gear swap.

Good luck to ya!!
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Old 02-19-2012, 07:21 AM   #25
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Originally Posted by baerbonesjones View Post
how would i check besides pulling the diff covers
If the diff covers have never been removed before, like Garland said there should be a metal tag on the back left of the diff.
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Old 02-19-2012, 07:28 AM   #26
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I have a 2002 Wrangler with 33's and 2 1/2 lift. I never have been able to get much more than 65 on the freeway. If I turn the A/C off I can get 70 and that's it.
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Old 02-19-2012, 07:31 AM   #27
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Not normal, at least in my limited experience,

My 2001/6cyl/auto/with 32s & 3.07 gears, has no problem maintaining any posted speed limit with or without hills.
If you have a 3-speed you will be at much higher RPM's than a 5-speed in 5th gear at highway speeds. If I stay in 4th I am fine but I will be running at 3100 RPM's. From what I understand a proper gear change should have a 5-speed running in the higher 2000's at 70+ mph in 5th gear.
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Old 02-19-2012, 07:34 AM   #28
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Originally Posted by Jeep Dad View Post
I have a 2002 Wrangler with 33's and 2 1/2 lift. I never have been able to get much more than 65 on the freeway. If I turn the A/C off I can get 70 and that's it.
It is funny how the A/C makes that much of a difference.

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