Rear End noise 40-50mph
03-11-2014 | 01:41 AM
#1
Thread Starter
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Joined: Jun 2010
Posts: 1
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Model: Cherokee
Rear End noise 40-50mph
Ok I have a 1998 jeep cherokee manual tranny 4wheel drive. 231j transfer case. dana 35 rear end. bone stock.
Recently when Im driving between 40 and 50 mph my rear-end howls it sounds just like a truck with big knobby tires (it's very loud not just tire on road sound). It happens when accelerating or decelerating but is more pronounced when accelerating or holding steady speed. It howls in neutral and in gear. Above 50 howling goes away but comes back at about 57-58 mph but is fainter.
So i changed the rear end fluid put in 75-140 gear oil nothing changed. Then I removed the drive shaft put it in 4wheel drive and drove it on the front driveshaft only, and the howling went away
. So i replaced the u-jionts put the drive shaft back in and the howling continues
.
My question is what could it be. pinon bearing? the reason I think it isn't is because if the bearing was going out not only would it still have spun without the drive shaft (I think) but why would the noise go away above 50?
Recently when Im driving between 40 and 50 mph my rear-end howls it sounds just like a truck with big knobby tires (it's very loud not just tire on road sound). It happens when accelerating or decelerating but is more pronounced when accelerating or holding steady speed. It howls in neutral and in gear. Above 50 howling goes away but comes back at about 57-58 mph but is fainter.
So i changed the rear end fluid put in 75-140 gear oil nothing changed. Then I removed the drive shaft put it in 4wheel drive and drove it on the front driveshaft only, and the howling went away
. So i replaced the u-jionts put the drive shaft back in and the howling continues.My question is what could it be. pinon bearing? the reason I think it isn't is because if the bearing was going out not only would it still have spun without the drive shaft (I think) but why would the noise go away above 50?
04-10-2014 | 01:09 PM
#4
Member
Joined: Mar 2013
Posts: 197
Likes: 0
From: Nor Cal
Year: 1994
Model: Grand Cherokee
Engine: 4.0
My guess would be you have a spun carrier shim and it's let the gears move out of spec or you have a bad bearing that has let the gears move out of spec. The howl is gear related so that should narrow it down for you.
Miles
Miles
04-10-2014 | 03:10 PM
#6
CF Veteran
Joined: May 2012
Posts: 3,242
Likes: 2
From: Colorado
Year: 1992 Cherokee Sport
Engine: Bone-Stock 242
Agreed on pinion bearings. Unbolt your shaft again (Just let it hang) and see how much side-to-side play your pinion has. Guarantee both pinion bearings are worn out.
Last edited by 1976Mustang; 04-10-2014 at 03:12 PM.
04-11-2014 | 10:24 AM
#7
Senior Member
Joined: Jun 2013
Posts: 579
Likes: 1
From: Wilton, CA
Year: '93
Model: Cherokee
Engine: 2.5L I4 (Mercedes Turbo Diesel planned)
Ok I have a 1998 jeep cherokee manual tranny 4wheel drive. 231j transfer case. dana 35 rear end. bone stock.
Recently when Im driving between 40 and 50 mph my rear-end howls it sounds just like a truck with big knobby tires (it's very loud not just tire on road sound). It happens when accelerating or decelerating but is more pronounced when accelerating or holding steady speed. It howls in neutral and in gear. Above 50 howling goes away but comes back at about 57-58 mph but is fainter.
So i changed the rear end fluid put in 75-140 gear oil nothing changed. Then I removed the drive shaft put it in 4wheel drive and drove it on the front driveshaft only, and the howling went away. So i replaced the u-jionts put the drive shaft back in and the howling continues.
My question is what could it be. pinon bearing? the reason I think it isn't is because if the bearing was going out not only would it still have spun without the drive shaft (I think) but why would the noise go away above 50?
Recently when Im driving between 40 and 50 mph my rear-end howls it sounds just like a truck with big knobby tires (it's very loud not just tire on road sound). It happens when accelerating or decelerating but is more pronounced when accelerating or holding steady speed. It howls in neutral and in gear. Above 50 howling goes away but comes back at about 57-58 mph but is fainter.
So i changed the rear end fluid put in 75-140 gear oil nothing changed. Then I removed the drive shaft put it in 4wheel drive and drove it on the front driveshaft only, and the howling went away
. So i replaced the u-jionts put the drive shaft back in and the howling continues.My question is what could it be. pinon bearing? the reason I think it isn't is because if the bearing was going out not only would it still have spun without the drive shaft (I think) but why would the noise go away above 50?
But in all seriousness, I had a problem similar to this, only it was anytime over 60MPH. Changed the diff fluid and it was a-okay after that! The old stuff was quite dirty....Probably sucked in a bit of mud from our last mudding trip, but that was about 6 months ago. Way too long before changing, I know.
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