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1999 Jeep Grand Cherokee vibration and whining/humming noise

Tiny
JESSE6101
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  • 1999 JEEP GRAND CHEROKEE
  • 141,000 MILES
My jeep has developed a whining/humming noise that only occurs during acceleration. The sound is vehicle speed dependent (the sound pitch gets higher) not engine speed dependent. On flat ground it isnt too bad unless I press the gas fairly hard but when at the top of a hill where the hill starts to level off, the vibration and sound is awful. Please help me locate the source and an idea of a repair cost.
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Sunday, June 2nd, 2013 AT 2:40 PM

30 Replies

Tiny
CJ MEDEVAC
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DOES IT DO IT IN PARK AND ON THE GAS PEDAL?

THE MEDIC
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Sunday, June 2nd, 2013 AT 4:04 PM
Tiny
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Nope this sound only occurs while driving down the road. The sound becomes audible at 35-40+ mph but that could be because of the sound of the Flowmaster overpowing it at lower speeds :). This sound only occurs while my foot is on the gas. I have checked the exhaust for anything rubbing or leaks and I found nothing. After three hours of driving above 55 mph this weekend Im preaty sure the sound and vibration is occurring somewhere in the front differential or front driveshaft or possibly transfer case or transmission. I can tell there is a little sound and vibration at the lower speeds but it's way to faint to locate below 35 mph. I do allot of driving above 55 mph in the summer as I go to Appomattox so this needs to be fixed before it drives me nuts!
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Sunday, June 2nd, 2013 AT 4:28 PM
Tiny
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I did look under it again and I found a slight problem with the driveshaft. I will try uploading some pictures.
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Sunday, June 2nd, 2013 AT 4:34 PM
Tiny
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I'M NOT UP ON THE CHEROKEE DRIVETRAINS OVER THE YEARS

WHAT SYSTEM DO YOU HAVE. TRANSFER CASE?

IF THIS IS PUSH BUTTON 4X4---IT MIGHT BE THAT SOMETHING DID NOT DISENGAGE. LIKE A FRONT HUB

'NUTHER POSSIBILITY

THIS IS OFTEN OVERLOOKED

. WELL THEY GET "LOOKED AT", BUT PROPER INSPECTION IS NOT DONE.I WILL REMAKE THESE PICS ONE DAY, I MADE THESE WHEN I WAS STILL SORTA "GREEN" ON THE COMPUTER, MY COLOR CHOICES LACKED. THESE ARE ON MY '46 WILLYS. YOURS ARE VERY SIMILAR

RETURN WITH A GRIN!

ARE YOU ABLE TO MAKE REPAIRS YOURSELF.I GOT MORE INFO SHOULD YOU NEED TO REPLACE THEM

THE MEDIC
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Sunday, June 2nd, 2013 AT 4:40 PM
Tiny
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Nice jeep! Okay so I have checked the drive shafts for any play and I found none. I did get some pictures to show some possible causing things and I will put those on shortly. My system is a quadra trac two and it has a 247 J transfer case
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Sunday, June 2nd, 2013 AT 5:06 PM
Tiny
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Okay I could only get those two pictures to cooperate with me but they show my main two concerns. The first picture is showing my front driveshaft where it enters the transfer case and the rubber or whatever it is is cracked and opened almost half way around. My second concern is shown in the last picture with the rear driveshaft from the transfer case to the first u joint it almost appears to me like the driveshaft is being pulled out. I saw this at first two days ago and when I went back to look at it just now it appears as if it has come out more. These are not all of my concerns but certainly these two things appear like they could be a problem.
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Sunday, June 2nd, 2013 AT 5:26 PM
Tiny
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One correction, the transfer case is a NEW PROCESS GEAR 247 J
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Sunday, June 2nd, 2013 AT 5:33 PM
Tiny
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As for repairs. Yes me and my dad can do the repairs but I think if its gonna cost more than $500 then ill just sell it for somone else to do all the fun work. I've had it for only a year and I love the abilities of the quadra trac 2 system and the awesome fuel economy but with the brake problems in the past and other little things that need to be replaced, I'd rather sell the jeep and put down the extra $1000 this one is gonna need for repairs towards a nice truck.
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Sunday, June 2nd, 2013 AT 6:02 PM
Tiny
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THE TRANSFER CASE/ DRIVE SHAFT MAY BE NORMAL. AS YOU HIT BUMPS, ETC, THE REAR SUSPENSION MOVES, THE DRIVE SHAFT IS PULLED IN AND OUT OF THE TRANSFER CASE ON SPLINES.

DEPENDING ON HOW YOU STOPPED IN FORWARD OR REVERSE AND HOW FAST, EVEN TERRAIN, MAY "TORQUE" THE REAR END UP OR DOWN. THIS MAY ACCOUNT FOR YOU SEEING A DIFFERENCE IN THE SHINY PORTION'S LENGTH STICKING OUT OF THE TRANSFER CASE

CAN A PASSENGER "HANG OUT" OF THE WINDOW AND LISTEN TO YOUR FRONT END?

THE DAMAGED CV BOOT IN YOUR PIC, "COULD BE" YOUR RACKET. THE BOOT KEEPS TRASH AND DIRT OUT OF THE BEARINGS. IF YOU'VE BEEN 'MUDDIN', YOU MAY HAVE ACCELERATED THE BEARING'S WEAR AND ABILITY TO WORK CORRECTLY.

A NEW CV JOINT MIGHT BE IN ORDER. WHEREVER YOU LIVE. DO YOU HAVE AN "ADVANCE AUTO PARTS" STORE NEARBY?

NEVER "SETTLE" FOR ANOTHER TROUBLE MAKER VEHICLE. IF THE WINDSHIELD WILL NOT LAY DOWN. YOU DON'T WANT IT!

THE MEDIC

I SORTA TOOK OLE TUCKER IN UNDER MY WING, HE'S IN COLLEGE, LOVES HIS JEEP, NEEDED TO LEARN HOW TO WORK ON HIS NEWLY PURCHASED JEEP. MAINLY, CATCH UP ON NEGLECTED MAINTENANCE. WE MESS W/ HIS ABOUT ONCE A WEEK

. SO, I DROPPED THE WINDSHIELD THEN I LET TUCKER DRIVE WILLY, MY '46, WHILE WE TOOK A BREAK FROM WORKING ON HIS '81 CJ 5 (HIS IS LEFT OF "WILLY" IN 1ST PIC)

. HE IS NOW HOOKED. WANTS A WILLYS TOO!

THE MEDIC
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Sunday, June 2nd, 2013 AT 10:47 PM
Tiny
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Okay so the vibration and sound getting worse when I hit bumps and at the top of hills makes me think that as those things are happening, the driveshaft being pulled in and out of the transfer case is making the sound perhaps something gets mis aligned? Also there is a leak in my front which In my pictures shows that it looks like its coming from a tube in the engine bay that runs down and it is just resting on my differential. This has been leaking for months and I did get a picture of where the tube is coming from.
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Monday, June 3rd, 2013 AT 4:26 AM
Tiny
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YOUR LAST PIC KINDA GOT ME LOST, I COULD NOT MAKE MUCH OUT OF IT

EVER HEARD OF "THE DEATH WOBBLE"?

MAYBE THIS IS THE EARLY STAGES. SEE WHAT THIS FELLER SAYS

'ROUND HERE, WE HAVE WHAT I CALL "ALIGNMENT SHOPS". AND WHAT I CALL "AN ALIGNMENT SHOP"

THE 1ST DABBLES IN EVERYTHING, ALIGNMENTS ARE SORTA AN "ELECTIVE" THEY MAY GO A WEEK BEFORE THEY DO ONE. MANY TIMES, THE "HELP" IS INEXPERIENCED.

"THE ALIGNMENT SHOP" SPECIALISES IN ALIGNMENTS AND SUSPENSION. CARS TO BIG TRUCKS!

. THIS IS WHERE I GO!

FIND YOU A DUMP TRUCK/ CONCRETE TRUCK/ ETC. OPERATION AND ASK THEM WHERE THEY GO!

AGAIN, 'ROUND HERE, THE FELLERS AT "THE ALIGNMENT SHOP" WILL COME OUT AND SORTA GIVE YOU A "QUICK VISUAL AND QUICK HANDS ON" DIAGNOSIS. REMEMBER, THEY CAN'T SEE SOME OF THIS STUFF TILL THEY "GET IN"

NEVER-THE-LESS. FROM "EXPERIENCE" THEY WILL MOST LIKELY BE ABLE TO TELL YOU WHAT KINDA STUFF MIGHT BE FOUND DURING EXPLORATORY SURGERY. EVEN MIGHT BE ABLE TO GIVE YOU A "BALL PARK ESTIMATE"

IF YOU FIND YOURSELF UNABLE TO LOCATE THE PROBLEM.I'D GO THE "THE ALIGNMENT SHOP". THIS MIGHT BE A FREE DIAGNOSES (EXPERIENCE AND REAL TIME). YOU MIGHT THEN DIY OR LET THEM FINISH THE JOB

WHATCHU THINK?

THE MEDIC
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Monday, June 3rd, 2013 AT 7:37 PM
Tiny
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My last picture is pointing towards the front of the vehicle showing the front differential and a tube coming down from the driver side of the engine bay. I believe this is the overflow for the differential but lately it has been leaking quite a bit and so I am going to check the differential fluids as we fix the cv boot. Im just confused why this tube is freely resting on the differential and is leaking so much.
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Tuesday, June 4th, 2013 AT 4:59 AM
Tiny
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THIS COULD BE THE "VENT" FOR THE DIFFERENTIAL

ON CJs, THE HIGH END OF THE HOSE HAS EITHER A METAL OR PLASTIC FITTING.

THE VERY END OF THAT HAS A "SOMEWHAT" FLOPPY CAP THAT ALLOWS AIR IN AND OUT, AND KEEPS THE MAJORITY OF DIRT OUT

HENCE. THE REASON IT'S UP HIGH WHERE "REASONABLE FOLKS" NEVER WILL BURY OR SUBMERGE IT. THE OTHER DIFF PROBABLY HAS ONE TOO

WILD GUESSING. MAYBE YOUR DIFFS ARE OVERFILLED?

NOT BEING REAL UP ON CHEROKEES, MY BUDDY HAS A 1987 WRANGLER (YJ) THERE ARE 3 VACUUM LINES THAT GO TO THE FRONT AXLE THAT ENGAGE OR DISENGAGE THE AXLE (NOT THE DIFF).I DON'T THINK YOU ARE REFERRING TO THAT

I WILL HAVE YOU SOME REALLY GOOD INFO---AFTER YOUR NEXT RESPONSE.I WORK UNTIL ABOUT 2030 HRS THIS EVENING, AND WILL GET BACK ON SOON AFTER

THE MEDIC
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Tuesday, June 4th, 2013 AT 10:09 AM
Tiny
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Yes this line does have a white/ clear plastic end but no cap and from my research I think it is supposed to be mounted up high where no water can get in not just laying on my differential. In the group of pictures I posted at first there are two pictures that are identicle and they show where that tube is coming from. It's the black tube that is connected to somthing below the brake lines and other brake stuff in the middle of the picture.
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Tuesday, June 4th, 2013 AT 10:28 AM
Tiny
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Well this afternoon I decided to put a camcorder in the engine bay and drive down the road. When I listened to the recording I could not hear the sound so I do not think it is the air box. Also I checked the fluid in the front differential and it is perfect and I fixed the tube after looking at the differential I discovered that the plastic end went into the top of the differential as a breather tube as you said.
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Tuesday, June 4th, 2013 AT 4:54 PM
Tiny
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OK........I REALLY HATE GIVING UP THE FOLLOWING INFO

KINDA TAKES AWAY THE NEED FOR ME!

THIS INFO IS THE BEST YOU CAN EVER GET FOR YOUR JEEP.....IT IS "WELL EXPLAINED"...TESTING AND TROUBLESHOOTING....ETC...ETC

IT MAY BE A BIT HARDER TO NAVIGATE THAN A BOOK (THIS IS ACTUALLY "THE BOOKs" SCANNED ONTO A SITE)........I RECKON I'M OLD FASHIONED AND LIKE TO FLIP PAGES....DOG-EAR PAGES....USE MY HIGHLIGHTER TO MAKE THINGS SORTA STAND OUT

BEST THING TO DO IS JUST SIT DOWN GO THRU/ SCROLL THRU EVERY SECTION FOR YOUR PARTICULAR VEHICLE QUICKLY....JUST TO GET A FEEL OF ALL OF THE INFO IN THERETHEN GO BACK AND FIND SPECIFIC INFO YOU DESIRE!

https://www.2carpros.com/questions/2005-jeep-tj-4-cylinder-6-speed-2-5l-wrangler-need-change-transmission-fluid

THE LINK ABOVE CONTAINS ALL YOU MIGHT EVER NEED........THAT IS ......"STOCK STUFF"

CONTINUE TO LEMME KNOW YOUR DEAL AS YOU GO..........I KNOW YOU WON'T NEED ME MUCH LONGER!...............EVEN THE QUESTION ASKER IN THE LINK...NEVER CAME BACK!

THE MEDIC
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Tuesday, June 4th, 2013 AT 7:10 PM
Tiny
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Did not get a chance to look on the website yet but today I put a camcorder directly below the transfer case and drove down the road. Sound was definitely audible in the recording and sounded like a higher pitch whine than in the inside. So I looked up other problems with the transfer case and I read that the chain in the transfer case has proven to loosen over time and I'm thinking that is the sound as many others have posted the same problem I am having on other forums and this was the source of the noise and vibration so I'm going to look into that soon and hopefully it's nothing that comes with a ridiculous price to fix.
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Wednesday, June 5th, 2013 AT 6:25 PM
Tiny
CJ MEDEVAC
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DOES THE SOUND CHANGE IF YOU RUN IT IN 4WD FOR A SHORT DISTANCE?

THE MEDIC
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Wednesday, June 5th, 2013 AT 7:44 PM
Tiny
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I do not know at the moment but I ill see test it out tomorrow and see
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Wednesday, June 5th, 2013 AT 8:24 PM
Tiny
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I played with the 4 low this morning and when backing up I heard nothing and when going foward down the road I heard just a little whining. It does hit hard when changing gears tho and when turning there is very loud and hard popping that does not feel like the steering to me.
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Thursday, June 6th, 2013 AT 6:04 AM

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