Rear end noise? Like a grinding noise.

markparks1 · 11-07-2008, 03:39 AM

i have a GMC 97 z71 and there is grinding noise coming from the back. Sounds like grinding brake pad in a way. Gets louder into the gas more and quiets down when you let off. Doesnt' do it in neutral. It not really loud but enough you can hear it. Jacked it up and spun the tires and the noise was coming from the rear end area and not the tires. Drives fine. Any advice or more questions please let me know.

bigz · 11-07-2008, 03:44 AM

you feel any slack in tires?

bigz · 11-07-2008, 03:45 AM

welcome to the forum!!

bigz · 11-07-2008, 03:52 AM

i think i read that wrong its to early lol is it coming from the differental?? if so check for metal shavings in your fluid, it something is wearing in there you can usually find metal shavings...

mudseeker · 11-07-2008, 05:57 AM

check for siezed u-joints. if they go bad they can tear your pinion bearing to bits. personal experiance

markparks1 · 11-07-2008, 12:09 PM

well no slack in the tires. runs fine. just the noise is annoying. figured it was the pinion gears.

scavanger · 11-07-2008, 08:50 PM

I agree with mudseeker . Check the Ujoints

Scav.

93Sierra · 11-07-2008, 08:58 PM

Quote:

Originally Posted by markparks1

well no slack in the tires.

Define that.

If I jack the read of my truck up, I can move the wheels 3/8 of a revolution before they stop.

Teh rear end also thuds around when I accelerate...Similar?

mudseeker · 11-08-2008, 09:20 AM

the simplest way to check ring and pinion backlash is to move the drive shaft while the rear tires are on the ground. the correct way though, is to remove the cover and use a dial indicator on the ring gear. moving the tires is going to affect the spider gears, which could also have to much play.

i have a f-150 in the bay at school that has this problem. it's a 5spd and every time you shift you can hear a clunk. it needs a whole new rear end due to excessive play of the spider gear and axle shaft splines. all that smacking of the spider gears womped out the pin and housing on the diff.

i believe the OP's problem is the u-joints and pinion bearing though.

11-07-2008, 03:39 AM	#1
markparks1 Junior Member Join Date: Nov 2008 Posts: 2	Rear end noise? Like a grinding noise. i have a GMC 97 z71 and there is grinding noise coming from the back. Sounds like grinding brake pad in a way. Gets louder into the gas more and quiets down when you let off. Doesnt' do it in neutral. It not really loud but enough you can hear it. Jacked it up and spun the tires and the noise was coming from the rear end area and not the tires. Drives fine. Any advice or more questions please let me know.

11-07-2008, 05:57 AM	#5
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,373	check for siezed u-joints. if they go bad they can tear your pinion bearing to bits. personal experiance __________________ i'd rather be hunting

11-08-2008, 09:20 AM	#9
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,373	the simplest way to check ring and pinion backlash is to move the drive shaft while the rear tires are on the ground. the correct way though, is to remove the cover and use a dial indicator on the ring gear. moving the tires is going to affect the spider gears, which could also have to much play. i have a f-150 in the bay at school that has this problem. it's a 5spd and every time you shift you can hear a clunk. it needs a whole new rear end due to excessive play of the spider gear and axle shaft splines. all that smacking of the spider gears womped out the pin and housing on the diff. i believe the OP's problem is the u-joints and pinion bearing though. __________________ i'd rather be hunting

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11-07-2008, 03:44 AM	#2
bigz Banned Join Date: Oct 2008 Posts: 462	you feel any slack in tires?

11-07-2008, 03:45 AM	#3
bigz Banned Join Date: Oct 2008 Posts: 462	welcome to the forum!!

11-07-2008, 03:52 AM	#4
bigz Banned Join Date: Oct 2008 Posts: 462	i think i read that wrong its to early lol is it coming from the differental?? if so check for metal shavings in your fluid, it something is wearing in there you can usually find metal shavings...

11-07-2008, 12:09 PM	#6
markparks1 Junior Member Join Date: Nov 2008 Posts: 2	well no slack in the tires. runs fine. just the noise is annoying. figured it was the pinion gears.

11-07-2008, 08:50 PM	#7
scavanger Senior Member Join Date: May 2007 Posts: 262	I agree with mudseeker . Check the Ujoints Scav.