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Old 05-10-2011, 03:45 PM
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Newbie Help!! Top speed is 65 mph in 5th gear.

Help!!! I just got a jeep wrangler 2004. It has a 6 cyl. engine and runs great. However, the top speed on the highway is 65-70 mph in 4th gear. When I shift to 5th it seems to stay at 70mph and won't go any faster. The engine doesn't seem like it is an issue. I think it may be a transmission issue. I recently put a new clutch in and so that should not be an issue. Any suggestions would be helpful.

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Old 05-10-2011, 05:14 PM   #2
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What gears? and What size tires?

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Old 05-10-2011, 05:23 PM   #3
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yea, grasskicker, does sound like gearing, huh?
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Old 05-10-2011, 05:29 PM   #4
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Hmm, it is a Jeep, not a Ferrari. 70 in a Jeep is like 200 in a Ferrari. And Jeeps are not designed for handling high speeds like a Ferrari.

Plus you gotta understand you are driving a giant box, not a streamlined speedster.
Lotta frontal area that has to push through the air.

And yeah I've been over the double century mark in vehicles designed for it, but a Jeep at 70 mph scares the bajeezus out of me. LOL!
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Old 05-10-2011, 05:29 PM   #5
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I had 3.07's with 33" tires, it slowed down in 5th gear with the pedal on the floor. I changed to 4.56 and Damn what a difference, you can get in traffic and "drive it like I stole it".
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Old 05-10-2011, 06:40 PM   #6
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Meh I've been ~80mph on the toll road.

What grasskicker said ^ gearing makes all if the difference. I just switched from 3.73s to 4.56s for 33" tires myself!
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Old 05-10-2011, 06:46 PM   #7
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Meh I've been ~80mph on the toll road.
I thought you said on the trail road when I first glanced at it..I was like holy smokes you're crazy
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Old 05-10-2011, 07:01 PM   #8
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Hmm, it is a Jeep, not a Ferrari. 70 in a Jeep is like 200 in a Ferrari. And Jeeps are not designed for handling high speeds like a Ferrari.

Plus you gotta understand you are driving a giant box, not a streamlined speedster.
Lotta frontal area that has to push through the air.

And yeah I've been over the double century mark in vehicles designed for it, but a Jeep at 70 mph scares the bajeezus out of me. LOL!
haha.. Iv had my YJ up to 105
That is some scary shit with a 4" lift, 2" shackles and 33MTs lmao
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Old 05-10-2011, 11:08 PM   #9
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haha.. Iv had my YJ up to 105
That is some scary shit with a 4" lift, 2" shackles and 33MTs lmao
Now this would be funny seeing it fly past you on the highway.
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Old 05-11-2011, 05:41 AM   #10
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been up to 75 with pedal to spare, but that was more than fast enough for me. if i need to get somewhere that fast, have 2 other vehicles more designed to drive at those speeds that i feel alot safer doing it in. have no desire to find out how good the roll cage works.
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Old 05-11-2011, 11:21 AM   #11
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It has a 6 cyl......
if you have anything over 31" tires with a 4.0l, you need to regear. Jeeps aren't built for speed, especially on a windy day
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Old 05-11-2011, 12:02 PM   #12
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Everyones answer to this seems to be...Your Jeep isnt made to go fast..ect.
That's total BS..not that it is made for speed but my TJ has no problem holding or gaining speed anywhere in the 55-75mph range. And that was with 32" tires on stock gears...and even now on 35" with stock gears.
Something is wrong with the Jeep or you have things like engine size..gears..tire size..somehow not working together.

I wouldn't just write it off as the Jeep isn't supposed to go that fast or its not a sports car so what do you expect.
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Old 05-11-2011, 12:09 PM   #13
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Jeeps aren't supposed to go that fast... That being said you do need to make sure that your gears are appropriate for your engine and tire... If it is a 6cyl on 33s you need 4:56 if it's 4cyl on 33s you need 4:88 and you should see a big difference. But again it really isn't a sports car and it isn't a big v8 in a pick up or suv you're just not going to see that type of performance.
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Old 05-11-2011, 12:21 PM   #14
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eh i've gone 90 no problem. Didn't even know i was going that fast. I stick it at 75 or less, but yeah windy days will kill you. literally.
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Old 05-11-2011, 05:06 PM   #15
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I don't think gears are a problem. I had stock gears and 33s for awhile and passed people on the highway. However I have no idea what it could be.
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Old 05-18-2011, 08:50 AM
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Thank you to all for your feedback. It seems the general concensus is to go from 3.07 to a 4.10. I looked at the 4.56 and it was suggested to stay away b/c of too high rpm's/too much strain on engine. I am getting quotes all over the board. The first one was $1950. Ouch!!! Then I am getting just labor costs at $750 plus parts. Question is what is a fair price for labor? What is fair price for parts? What are good parts to put in? I want quality but not the top grade. this is just a 3rd car to ride around town and to the beach. Thanks.
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Old 05-18-2011, 09:46 AM   #17
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Flip, several asked you what tire size you have but you never answered so I'll ask again... what tire size are you running?

Also, exactly what axle ratio is in your axle? Your axle ratio is stamped onto a tag bolted onto the left side of each axle's differential cover. The below photo shows the axle ratio circled in red which is indicating the axle in the photo has a 3.73 ratio.
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Old 05-18-2011, 09:55 AM   #18
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Flip,

Gear ratio should be based on your tire size. You still have not said what size tires you have.

FYI I have 4 speed auto, 33, 3.73 and I have no problem getting over 90 mph
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Old 05-18-2011, 10:26 AM   #19
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Flip,

If you are missing your tag on the rearend. Jack up the rear and rotate the tires. (Don't forget the jackstands...safety)
1. Make a slash mark with a marker or chaulk on the tire and rear driveshaft.
2. Rotate tire one full revolution while counting the driveshaft revolution.

This will give you a ruff idea on the gear size (a poormans method!).

Good luck,
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Old 05-18-2011, 10:30 AM   #20
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Good suggestion but with an open axle as he likely has, he'll have to rotate the rear tire precisely two revolutions to get the ratio from the number of times the rear driveshaft rotates.
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Old 05-18-2011, 10:34 AM   #21
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Good suggestion but with an open axle as he likely has, he'll have to rotate the rear tire precisely two revolutions to get the ratio from the number of times the rear driveshaft rotates.
Really? I haven't given that any thought. Thanks for your input, I don't want to steer anyone the wrong way. Thanks!

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Old 05-18-2011, 11:55 AM   #22
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If missing the tage on the rear, don't forget to look at the front diff.
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Old 05-19-2011, 07:10 AM
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thanks for all of the input. Ok...tires are 32 and here are the numbers on front are
52099198AE
3076013121

The back are hard to read but best guess
521??1??AF
307685????
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Old 05-19-2011, 07:24 AM
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Also I have been told the axles are 30 and 35. Is that right?
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Old 05-19-2011, 07:25 AM
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I still can't determine what a fair price is for labor and parts. Any thoughts?
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Old 05-19-2011, 10:04 AM   #26
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You have 3.07 gears with 32" tires. That setup is not to awful bad but 4.10 would be better. Check with a local 4x4 shop or club in your area, maybe someone can help with $. Do you have a rubber fill plug on the back side of your rear axel? If so you have a D35.
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Old 05-19-2011, 11:12 AM   #27
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As said above, your axle ratio is 3.07 which makes your engine rpms too low for a tire as big as 32". Your engine is lugging which is why your Jeep can't maintain speed at 65-70 mph. Regearing both axles to 4.10 will completely fix that problem and your Jeep will be able to easily cruise at any speed you want.

The total cost to regear both axles typically falls around $1100 though some get it done for just under $1000 (very rare) with some shop trying to rip off inexperienced customers by quoting as high as $1700-1800.
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Old 05-20-2011, 07:55 AM
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Jerry....thx for input. I feel good about the gear change. Do you or anyone know anyone in Orlando you trust?
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Old 05-20-2011, 08:01 AM   #29
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Flip, what's the RPM's you're running when going 65. You said you could only go fast by shifting into 5th, if that's true, then that's NOT gearing related as 5th would bog the engine down more and you'd go slower. Can you go faster in 4th? The reason I ask, is if you can run better in 4th, I'd suggest using 4th since you have such a tire size difference. If you can't go faster in 3rd or 4th though on the highway, something else is wrong, I've had the 01 up to 85 with no problems and you shouldn't be hitting a "brick wall" when you go 70.
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Old 05-20-2011, 08:17 AM   #30
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