grinding noise, HELP!!

championmayday · 03-20-2009, 07:14 PM

to start its a 98 4.0 auto np231 TC, and chrysler rearend. i have a grinding noise that sounds like its coming from the rearend but hard to really tell. it does it coasting in neutral as well, also makes a howling noise making left turns.here is what ive done so far... replaced wheelbearings front and back, changed diff fluid front and back looked ok no metal flakes or anything, checked brakes front and rear for anything missing or loose. changed ujoints on driveshafts. the only thing i noticed is there is play in the rear driveshaft where it goes into the TC. is there suppose to be any play there? idk i do know the noise is still there. could the rear output bearing on the TC cause this? if not im guessing carrierbearings.

89Cherokee · 03-20-2009, 07:23 PM

Sounds like a diff bearing

championmayday · 03-20-2009, 08:27 PM

thats what im guessing i just dont know about the play where the driveshaft goes into the TC. i dont want to buy a entire rearend and it turn out to be that.

Steveo · 03-20-2009, 11:30 PM

just grab the yoke on the rear diff and see if theres any unreasonable play to it, if not i'd try to get the output bearing replaced on the TC, if i remember correctly they're only like 12 bucks or so.

championmayday · 03-22-2009, 08:20 PM

there is no play going into the diff.

03-20-2009, 07:14 PM	#1
championmayday Junior Member Join Date: Nov 2008 Location: SOMERSET KY GO BIG BLUE Posts: 96 My Photos 1998 Cherokee Year: 1998 Model: Cherokee Engine: 4.0HO Transmission: AW4 Transfer Case: NP231 Front Axle: dana 30 Rear Axle: crysler 8.25 Tires: 31/10.50/15 trxux MT Lift Specifications: coming soon	grinding noise, HELP!! to start its a 98 4.0 auto np231 TC, and chrysler rearend. i have a grinding noise that sounds like its coming from the rearend but hard to really tell. it does it coasting in neutral as well, also makes a howling noise making left turns.here is what ive done so far... replaced wheelbearings front and back, changed diff fluid front and back looked ok no metal flakes or anything, checked brakes front and rear for anything missing or loose. changed ujoints on driveshafts. the only thing i noticed is there is play in the rear driveshaft where it goes into the TC. is there suppose to be any play there? idk i do know the noise is still there. could the rear output bearing on the TC cause this? if not im guessing carrierbearings.

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03-20-2009, 07:23 PM	#2
89Cherokee Member Join Date: Mar 2009 Location: Parker, CO Posts: 233 My Photos 1989 Cherokee Year: 1989 Model: Cherokee Engine: 4.0 Transmission: ax-4?? Transfer Case: 231 Front Axle: 30 Rear Axle: 35 Tires: stock Lift Specifications: none	Sounds like a diff bearing

03-20-2009, 08:27 PM	#3
championmayday Junior Member Join Date: Nov 2008 Location: SOMERSET KY GO BIG BLUE Posts: 96 My Photos 1998 Cherokee Year: 1998 Model: Cherokee Engine: 4.0HO Transmission: AW4 Transfer Case: NP231 Front Axle: dana 30 Rear Axle: crysler 8.25 Tires: 31/10.50/15 trxux MT Lift Specifications: coming soon	thats what im guessing i just dont know about the play where the driveshaft goes into the TC. i dont want to buy a entire rearend and it turn out to be that.

03-20-2009, 11:30 PM	#4
Steveo Junior Member Join Date: Mar 2009 Posts: 68 My Photos	just grab the yoke on the rear diff and see if theres any unreasonable play to it, if not i'd try to get the output bearing replaced on the TC, if i remember correctly they're only like 12 bucks or so.

03-22-2009, 08:20 PM	#5
championmayday Junior Member Join Date: Nov 2008 Location: SOMERSET KY GO BIG BLUE Posts: 96 My Photos 1998 Cherokee Year: 1998 Model: Cherokee Engine: 4.0HO Transmission: AW4 Transfer Case: NP231 Front Axle: dana 30 Rear Axle: crysler 8.25 Tires: 31/10.50/15 trxux MT Lift Specifications: coming soon	there is no play going into the diff.

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