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Old 01-22-2014, 06:21 PM   #1
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hearing noise while in fifth gear

Hello, names Andrew (noob). I'm about to buy a second jeep which is a 91 five speed stick. current owner say there is a noise while in fifth gear. Is something easily fixed? Thanks

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Old 01-22-2014, 11:44 PM   #2
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Interesting... i too recently discovered a noise that i hear only in 5th gear... not an obnoxious loud noise... more like the sound a playing card makes in the spoke of a bicycle... let me know if you get any useful suggestions... other than rebuilding the tranny

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Old 01-23-2014, 08:15 AM   #3
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I've read where a lot of the 2.5l jeeps had problems with 5 gear making noises and going out. When I got my 95 yj I did a lot of shopping around and I'd say out of the 25 I looked at 5 or six of then had no 5 th gear and the one I got just had the transmission rebuilt. So it kinda seems common
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Old 01-23-2014, 10:12 AM   #4
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Originally Posted by kbartoletta View Post
Interesting... i too recently discovered a noise that i hear only in 5th gear... not an obnoxious loud noise... more like the sound a playing card makes in the spoke of a bicycle... let me know if you get any useful suggestions... other than rebuilding the tranny
I notice the same thing in my '94 4.0 YJ but only when I have my 4WD on and I'm in 5th.
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Old 01-23-2014, 04:43 PM   #5
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I notice the same thing in my '94 4.0 YJ but only when I have my 4WD on and I'm in 5th.
Really? Your noise is most likely the front driveshaft vibration...Why?...because the vehicle that you drive IS NOT designed to be driven in 4WD in 5TH GEAR at highway speeds.

The front drive shaft on a wrangler isn't balanced, because it was designed for a part-time 4wd vehicle. Which means only needing it part time, as in off pavement, playing on back roads. Or in the mud. Slow speeds...under 35 mph max I believe is what the manual says.

You can drive it like that, sure, will it hurt it?, doubt it. other than wear out parts long before they would normally last.

Seriously, the YJ wasn't made to ride around in 4wd all the time like the XJ or an S10 Blazer. ( XJ and S10 both have balanced front shafts as well as CV joint front shafts)
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Old 01-24-2014, 11:28 AM   #6
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Originally Posted by 0III0forlife View Post

Really? Your noise is most likely the front driveshaft vibration...Why?...because the vehicle that you drive IS NOT designed to be driven in 4WD in 5TH GEAR at highway speeds.

The front drive shaft on a wrangler isn't balanced, because it was designed for a part-time 4wd vehicle. Which means only needing it part time, as in off pavement, playing on back roads. Or in the mud. Slow speeds...under 35 mph max I believe is what the manual says.

You can drive it like that, sure, will it hurt it?, doubt it. other than wear out parts long before they would normally last.

Seriously, the YJ wasn't made to ride around in 4wd all the time like the XJ or an S10 Blazer. ( XJ and S10 both have balanced front shafts as well as CV joint front shafts)
I guess the moral of the story is slow the heck down lol i personally have never gone above 30mph in 4wd just cause if its bad enough out to need 4wd to go then how r u going to stop (especially without ABS)?
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Old 01-24-2014, 05:20 PM   #7
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mine howls in 5th , im going to change the tranny fluid , to some Redline M/T 90 and see if that a difference
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Old 01-24-2014, 05:20 PM   #8
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I guess the moral of the story is slow the heck down lol i personally have never gone above 30mph in 4wd just cause if its bad enough out to need 4wd to go then how r u going to stop (especially without ABS)?
4wd has no bearing on Stopping power....
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Old 01-24-2014, 06:27 PM   #9
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My '91 has the same kind of noise in 5th gear, kind of a "whirring" sound. I was told that it is probably the 5th gear synchro ring going out. I would love to hear a confirming or any different 2nd opinion.
I did change transmission oil, but it made no difference.
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Old 01-24-2014, 06:27 PM   #10
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4wd has no bearing on Stopping power....
Noooo how about u read. i said if the road is bad enough to need 4wd to go how r u gonna stop
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Old 01-24-2014, 06:40 PM   #11
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And sorry if that was rude i just hate it when people twist what i say
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Old 01-24-2014, 06:43 PM   #12
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Not rude, no worry's! Where at in Pittsburgh? Dad live's in Franklin/Oil City Area
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Old 01-24-2014, 06:48 PM   #13
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I live in the north hills about 20 mins north of the city
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Old 01-24-2014, 09:48 PM   #14
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Originally Posted by kbartoletta View Post
Interesting... i too recently discovered a noise that i hear only in 5th gear... not an obnoxious loud noise... more like the sound a playing card makes in the spoke of a bicycle... let me know if you get any useful suggestions... other than rebuilding the tranny
The noise that you are hearing is happening in all of the other gears too (except reverse) because the synchronizers are getting wore from the 100+ thousand miles that are on them.

The reason you are hearing 5th, is because it is on the shaft that is closest to you in the trans as well as it is spinning at that speed. There are 3 shafts in a standard trans. the shaft on the far right is 1st and 2nd, the one in the middle is 3rd and 4th, and the one closest to the driver is 5th and reverse.

Actually 2nd and 3rd usually have the worst synchros in them cause they are the most common gears to be in while driving in town. The more times you use the gear, the more the synchro will wear. But you don't hear those being bad, cause they are the center shaft and right shaft, and they aren't spinning fast enough to hear the noise.

You want to hear it sound scary...take a piece of 1/4" rubber hose and stick one end in your ear, and the other end on the top of the shifter while you are going down the road...it will sound like its coming apart.
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Old 01-24-2014, 11:11 PM   #15
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Actually......4WD DOES help improve braking IF you use it correctly..... do a google search on "Dynamic Braking" and follow the laws of physics.
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Old 01-24-2014, 11:19 PM   #16
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Quote:
Originally Posted by 0III0forlife View Post

The noise that you are hearing is happening in all of the other gears too (except reverse) because the synchronizers are getting wore from the 100+ thousand miles that are on them.

The reason you are hearing 5th, is because it is on the shaft that is closest to you in the trans as well as it is spinning at that speed. There are 3 shafts in a standard trans. the shaft on the far right is 1st and 2nd, the one in the middle is 3rd and 4th, and the one closest to the driver is 5th and reverse.

Actually 2nd and 3rd usually have the worst synchros in them cause they are the most common gears to be in while driving in town. The more times you use the gear, the more the synchro will wear. But you don't hear those being bad, cause they are the center shaft and right shaft, and they aren't spinning fast enough to hear the noise.

You want to hear it sound scary...take a piece of 1/4" rubber hose and stick one end in your ear, and the other end on the top of the shifter while you are going down the road...it will sound like its coming apart.
Ok...you talk as if this is something common...1so what is a synchro and is it fixable? Or even treatable?
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Old 01-24-2014, 11:30 PM   #17
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Ok...you talk as if this is something common...1so what is a synchro and is it fixable? Or even treatable?
A synchronizer is on each of the gear clusters, and it makes the gear spin at the same speed as the center shaft in the trans. i.e. what ever your road speed is, so that you can shift. A good example is reverse gear doesn't have "synchros" on it, therefore you cant shift into that gear if you are moving, all it will do is grind.

Fixable? requires a trans rebuild...Treatable? Somewhat if they aren't really bad, you can buy an aftermarket product from Lucas Oil Products called shift-eze...it works in all trans. manual and auto. But its just a Band-Aid so to speak.
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Old 01-24-2014, 11:40 PM   #18
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Great info. Thanks
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Old 01-25-2014, 07:58 PM   #19
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Originally Posted by 0III0forlife View Post
Really? Your noise is most likely the front driveshaft vibration...Why?...because the vehicle that you drive IS NOT designed to be driven in 4WD in 5TH GEAR at highway speeds. The front drive shaft on a wrangler isn't balanced, because it was designed for a part-time 4wd vehicle. Which means only needing it part time, as in off pavement, playing on back roads. Or in the mud. Slow speeds...under 35 mph max I believe is what the manual says. You can drive it like that, sure, will it hurt it?, doubt it. other than wear out parts long before they would normally last. Seriously, the YJ wasn't made to ride around in 4wd all the time like the XJ or an S10 Blazer. ( XJ and S10 both have balanced front shafts as well as CV joint front shafts)
I do want to thank you for that wonderful condescending way you informed me of that information.

I bow down to your superior intellect and will be sure to check with you in the future before I post anything.

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