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Old 01-15-2017, 12:53 PM
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02' TJ won't go over 60

Hey everyone,

Just purchased my first Wrangler (02' TJ X) last week and am having a weird issue with the Jeep pretty much topping out at 60mph. I've read a lot on here about this issue before posting, pretty much the general consensus I've seen is this is a catalytic converter issue? I don't know a lot about the vehicle, unfortunately i had to buy it from a buy-here-pay-here place so i knew there would likely be some issues i needed to address. The vehicle has 129K on it, 2 owners, NV vehicle its' entire life. I havn't really gone past 3,000 rpm's in any gear, but it doesn't seem to have any power loss until you hit 60. sometimes it'll go 65. I'm trying to find out if anyone has anything else i should check before i go out and purchase parts as I'm limited on how much I can throw at this before I need it for a roadtrip for a wedding at the end of feb... I don't have the tools or the know-how to DIY stuff, so I'm going to have to take her to a shop and suck up the labor, trying to nail down the issue. any help is appreciated.


thanks,
beau

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Old 01-15-2017, 02:03 PM   #2
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Is it throwing any codes ? Is it stock without a lift or bigger tires ?
I'll be honest, you need to get to know that thing before you throw a suitcase in it for a road trip, especially if you're on a limited budget. Find a different way to get safely & on time to that wedding.
Btw, older Chrysler vehicles, limited mechanical skills, no garage & low funds don't usually mix very well.

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Old 01-15-2017, 07:15 PM
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Originally Posted by AZ01TJ View Post
Is it throwing any codes ? Is it stock without a lift or bigger tires ?
I'll be honest, you need to get to know that thing before you throw a suitcase in it for a road trip, especially if you're on a limited budget. Find a different way to get safely & on time to that wedding.
Btw, older Chrysler vehicles, limited mechanical skills, no garage & low funds don't usually mix very well.
I figured 2 months of daily driving would be enough to know if she was suited for a 4 hour drive but the more I'm getting feedback on this, it looks more like a gearing issue which is not something I can afford for about a year anyways so she may just get parked.

She has a 3"-3.5" on 33" mickey thompson MTZ's. 30 in the front and 35 in the back, gearing is 3.07 fml... I sure as hell don't have 2,000 to fork out to regear to 4.56 or 4.88 like everyone has told me elsewhere after just dropping 3K on a downpayment.

Not everyone needs to be a super mechanic to enjoy jeeps, this is my 3rd
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Old 01-15-2017, 07:16 PM
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oh and no codes checked yet.
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Old 01-15-2017, 08:41 PM   #5
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30 in the front and 35 in the back, gearing is 3.07 fml... I sure as hell don't have 2,000 to fork out to regear to 4.56 or 4.88 like everyone has told me elsewhere after just dropping 3K on a downpayment.
See if there are any junkyards in your area with 4cyl TJs in them. They came with 4.10 axles in them (30 front, 35 rear) from the factory. They wouldn't be perfect for 33's, but would be better than 3.07 and a heck of alot cheaper than a regear. The yard may take your axles back for some credit, too.
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Old 01-15-2017, 09:13 PM   #6
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So a 4.0 is it 3 SPd auto or 5 SPd manual

33 tires is speedo corrected or are you going faster than 60 when speedo says 60

What is rpm when tops out on speed.

With 3.07 if not wanting to rehear use smaller tires more like 29 or 30"


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Old 01-16-2017, 01:06 AM   #7
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02' TJ won't go over 60

Question - are you pushing 60MPH in 5th gear with that ring and pinion/those tyres?
I would suggest there's no issue with the powerplant - just gear ratios - drop it into 4th and cruise with higher rpms

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Old 01-16-2017, 11:57 AM   #8
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As Digger asked...make sure you have the right Speedo gear in it. It does not change/effect performance, it only corrects your Speedometer. Currently if you speedo says 60, you might actually be doing 70+.

Jeep Speedometer Gear Tooth Chart | Quadratec
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Old 01-16-2017, 03:48 PM
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thanks everyone

-am going to check spedo against my GPS to make sure
-am about to go test drive it and check a few things, am going to video the RPMs
-i dont know if the right spedo is in there, i have no knowledge of work done by prior owner unfortunately
-going to try pushing her harder in 4th but havn't had much luck with that yet
-i have heard the 2.5 TJ's had that other axle and if it is a gearing issue the junk yard is the only way i can afford that anytime soon so will check that out and if i go that route ill try to sell mine back or see if anyone on forums wants them, although i doubt anyone will lol
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Old 01-16-2017, 05:00 PM
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OK, so just took her out for another test. This time i pulled up my navigation on my phone to compare speeds. Turns out I'm going faster than I thought. I was able to get to 5000rpms in my low gears (didn't push it that far past 3rd gear) and was able to get up to what my speedometer reads as 65mph. Had my passenger look at my phone, and it said I was going 73mph.

With that said, does this mean i can breathe a bit on replacing my gearing in my axle for a bit and can just change a part for the spedo to be showing the correct info?
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Old 01-16-2017, 05:31 PM
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I'm assuming this is my fix:

PPR Industries 30910626 26 Tooth Speedometer Gear for 93-06 Jeep® Vehicles | Quadratec

based on this chart, my 3.07 I'll have to run the 26 teeth gear.
Jeep Speedometer Gear Tooth Chart | Quadratec

this is how i fix it:
https://www.youtube.com/watch?v=W3WOHHYUmhI
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Old 01-17-2017, 01:27 PM   #12
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Quote:
Originally Posted by tacticalbeau View Post
...

Not everyone needs to be a super mechanic to enjoy jeeps, this is my 3rd
Your initial post said this was your first, so it was assumed you meant first Jeep - looks like you meant first Wrangler - which is the only true Jeep in many people's eyes - can I get an AMEN from the congregation?

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Originally Posted by tacticalbeau View Post
...was able to get up to what my speedometer reads as 65mph. Had my passenger look at my phone, and it said I was going 73mph.

With that said, does this mean i can breathe a bit on replacing my gearing in my axle for a bit and can just change a part for the spedo to be showing the correct info?
Well, you definitely need a different speedo gear if you want the speedometer and odometer to be accurate ... simplest approach is to count the teeth on what you have and multiply that by the ratio of indicated speed to actual speed (0.89).

The axle gearing is really a matter of preference. If you're doing a lot of highway driving, the low gear ratio is going to put a lot of pressure on the tranny trying to push those 33's. You'll trade gas mileage for torque and longevity in the drivetrain, but probably a good idea.

Quote:
Originally Posted by tacticalbeau View Post
I'm assuming this is my fix:

PPR Industries 30910626 26 Tooth Speedometer Gear for 93-06 Jeep® Vehicles | Quadratec

based on this chart, my 3.07 I'll have to run the 26 teeth gear.
Jeep Speedometer Gear Tooth Chart | Quadratec

this is how i fix it:
http://www.youtube.com/watch?v=W3WOHHYUmhI
Well, that sizing chart doesn't list the 26 tooth gear for 33's on a 3.07 because it's a pretty bad combo (for reasons mentioned above). If you buy one, it may still not be accurate - so not sure it's worth spending the money as long as you can do the mental math and remind yourself of your actual speed. After all, speed is just a number...

For what it's worth, that video is pretty accurate (and entertaining)... the job is simple.
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Old 01-17-2017, 10:20 PM
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Originally Posted by WBN3 View Post
Your initial post said this was your first, so it was assumed you meant first Jeep - looks like you meant first Wrangler - which is the only true Jeep in many people's eyes - can I get an AMEN from the congregation?



Well, you definitely need a different speedo gear if you want the speedometer and odometer to be accurate ... simplest approach is to count the teeth on what you have and multiply that by the ratio of indicated speed to actual speed (0.89).

The axle gearing is really a matter of preference. If you're doing a lot of highway driving, the low gear ratio is going to put a lot of pressure on the tranny trying to push those 33's. You'll trade gas mileage for torque and longevity in the drivetrain, but probably a good idea.



Well, that sizing chart doesn't list the 26 tooth gear for 33's on a 3.07 because it's a pretty bad combo (for reasons mentioned above). If you buy one, it may still not be accurate - so not sure it's worth spending the money as long as you can do the mental math and remind yourself of your actual speed. After all, speed is just a number...

For what it's worth, that video is pretty accurate (and entertaining)... the job is simple.
I def. consider it my first REAL Jeep, although i loved my XJ, the liberty, not so much... embarassed to even admit it honestly haha. She is my DD and will more than anything else be driven on the highway to/from work, but still sees off-road driving plenty. These tires are only going to last me until about summer, so i may go down to 31's at that point because doing all the axle stuff is beyond my financial capability for at least a year... I know getting a donor axle from a 2.5 TJ has been suggested as a cheaper alternative due to the native 4.56 gearing, something I'm considering for a cheaper alternative down the road. Since the spedo part is only $40 ill prob end up doing it just so i dont have to think about it, or if the wifey is driving she doesnt have to think about it.

That guys channel is epically hilarious, I'm hooked.

Thanks for the help i appreciate it!
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Old 01-22-2017, 04:49 PM   #14
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I know I'm in late on this one. But I have an off the wall suggestion. Take your 35" tires off the back and put them on the front. Put the 33" tires on the rear. Do a test drive without any tight turns, somewhere you will be safe to do a speed test. see if it has a better speed response.
35" tires on a 4 cylinder with stock gears is way over size. I'd say that even 33" tires are way oversize for your stock gearing too.
I know it's a silly suggestion, but it might open your eyes to the true problem.
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Old 01-22-2017, 07:22 PM   #15
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Originally Posted by Alley Oop View Post
I know I'm in late on this one. But I have an off the wall suggestion. Take your 35" tires off the back and put them on the front. Put the 33" tires on the rear. Do a test drive without any tight turns, somewhere you will be safe to do a speed test. see if it has a better speed response.
35" tires on a 4 cylinder with stock gears is way over size. I'd say that even 33" tires are way oversize for your stock gearing too.
I know it's a silly suggestion, but it might open your eyes to the true problem.
I think he meant he has a Dana 35 in the rear, not 35" tires in the rear.
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Old 01-24-2017, 12:57 AM   #16
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I have a 2006 4.0 and when I first got it a few months ago the fuel mileage was only around 12 to 13 combined freeway city, also the power was really poor on the freeway. Everything on the motor was new...no trouble lights, I assumed all was normal...mileage all freeway about same as yours. Last week error code on up stream o2 sensors so I changed them both, now tons more power and my mileage looks way improved...30 more miles on half a tank so far. Very the o2 sensors are almost out of range and the engine is running rich, killing the power and gas mileage. Mine were bad just not enough to throw the codes. Only takes a few minutes to change each sensor with the $30 dollar wrench.
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Old 01-24-2017, 01:00 AM   #17
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Also only use mopar replacements, many aftermarket replacements don't work well due to voltage issues.

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