name that noise! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

matt_field · 07-17-2002, 11:44 PM

its in my rear end, its wholing or however you spell it when you let off the gas? just replaced u joints and hanger bearing what else? rear end bad? can i just replace parts not the whole thing? thanks

da-burb · 07-18-2002, 12:01 AM

"Howling" is the word I think you wanted. I am no differential expert, but it sounds like your ring and pinion are not aligned correctly. It could be worn out or it might just need shimming. It is probably cheaper to swap out the rear than to fix it, but then you could be buying more problems. Try to find an expert to take a look.
The easy thing for you to do is pull the differential cover and take a look for yourself. Look for metal shavings, worn gears, and rust pits on the gears. It's a start.

matt_field · 07-18-2002, 12:12 AM

hey , thanks alot ill have to check it out

Blue_71 · 07-18-2002, 12:28 AM

this is probably a stupid question, but you dont have knobby mud tires do you? they will roar like everything, and you might not hear it because the sound of the truck during acceleration

(edit for spelling)

bbs1965 · 07-18-2002, 12:32 AM

too bad your not close to Texas I have 6 lug rearends piling up on me. I can't seem to sell em.

**ThreeQuarter** · 07-18-2002, 02:05 PM

Yeah, that howling comes from wear in the differential. I've had it in my last several trucks. Only one of them went out but it howled BAD for three years and 80,000 miles before it cratered. Have an expert check it out, or just turn up the radio. LOL

matt_field · 07-18-2002, 11:31 PM

defeintly not tires, it gets weird sounding when you let off the gas like REALLY loud then kinda dies off, then not howling when gas on, id like a good rear end just to throw in it, or rebuild mine?

**1970 CST Short Wide** · 07-19-2002, 12:43 PM

Possibly Pinion bearing, time for rebuild or replace, they never get better only worse

GMC JUNKIE TOO · 07-25-2002, 01:19 AM

mine howled then I put in straight lucas hub oil quieted it down. I had a guy tell me it was a worn pinion gear

matt_field · 07-25-2002, 11:34 PM

new info, haha .. whenever i go around a corner it makes the noise the worst in thinking maybe bearing? or howabout the transfer case? anything go wrong in there? thanks alot
matt

Longhorn Man · 07-25-2002, 11:51 PM

Most likely it is too late, but have you checked the oil level in the rear?

jhwkns · 07-25-2002, 11:52 PM

Check your axle bearings Matt. If that's all it is it's a cheap fix. Good Luck.

*Zkast* · 07-25-2002, 11:56 PM

Somewhat of an easy test, At around 25-30mph turn left, then right. If the noise is loudest when your turn right, the left bearing has a problem. If the noise is loudest when you turn left, the right bearing has a problem.

If you getting alot of howling from the rearend only on coast or decel, thats basicly the sounds of a worn rear-end. Its a combination of bearing (differential carrier and pinion) and gear wear creating too much backlash between the gears.
Bearings typicaly make a rythmic growning sound that comes and goes. The backlash problem just creates a loud howl that stays constant and is related to speed.

You if you catch it quick enough you can have someone that is experienced with differentials, replace all the bearings and check the teeth wear pattern.

matt_field · 07-26-2002, 12:05 AM

the gear lube is full, its loud at coast, and at turning, maybe ill have a expert in town look at it thanks alot for your help guys!

71-longbed · 03-12-2003, 05:22 PM

very similar problem with my truck.... sometimes it "clunks" when shifting from park to reverse....kinda hops forward after shifting into drive ...... how long do you think i have before it goes ???
very smooth shift between drive, L1 and L2..... ive found it clunks less when i move it from park to nuetral and then into reverse instead of just park to reverse.....does that make sense ?? any input on the subject would be great
thanks

The Terminator · 03-12-2003, 07:27 PM

Quote:

Originally posted by 71-longbed
very similar problem with my truck.... sometimes it "clunks" when shifting from park to reverse....kinda hops forward after shifting into drive ...... how long do you think i have before it goes ???
very smooth shift between drive, L1 and L2..... ive found it clunks less when i move it from park to nuetral and then into reverse instead of just park to reverse.....does that make sense ?? any input on the subject would be great
thanks

I would call that a U-joint that was gong bad. Best -

AndrewDT · 03-13-2003, 04:00 PM

"its in my rear end, its wholing or however you spell it when you let off the gas? "

Matt, sounds like maybe you ate some bad chilie.

07-17-2002, 11:44 PM	#1
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	name that noise! its in my rear end, its wholing or however you spell it when you let off the gas? just replaced u joints and hanger bearing what else? rear end bad? can i just replace parts not the whole thing? thanks __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

07-18-2002, 12:01 AM	#2
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	"Howling" is the word I think you wanted. I am no differential expert, but it sounds like your ring and pinion are not aligned correctly. It could be worn out or it might just need shimming. It is probably cheaper to swap out the rear than to fix it, but then you could be buying more problems. Try to find an expert to take a look. The easy thing for you to do is pull the differential cover and take a look for yourself. Look for metal shavings, worn gears, and rust pits on the gears. It's a start. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

07-18-2002, 12:12 AM	#3
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	hey , thanks alot ill have to check it out __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

07-18-2002, 02:05 PM	#6
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,522	Yeah, that howling comes from wear in the differential. I've had it in my last several trucks. Only one of them went out but it howled BAD for three years and 80,000 miles before it cratered. Have an expert check it out, or just turn up the radio. LOL __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3 Last edited by ThreeQuarter; 07-18-2002 at 02:11 PM.

07-18-2002, 11:31 PM	#7
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	defeintly not tires, it gets weird sounding when you let off the gas like REALLY loud then kinda dies off, then not howling when gas on, id like a good rear end just to throw in it, or rebuild mine? __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

07-18-2002, 12:32 AM	#5
bbs1965 Open Sundays 10 till 10 Join Date: Nov 2000 Location: Waxahachie,Texas 75165 Posts: 1,009	too bad your not close to Texas I have 6 lug rearends piling up on me. I can't seem to sell em.

07-19-2002, 12:43 PM	#8
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,168	Possibly Pinion bearing, time for rebuild or replace, they never get better only worse __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

07-25-2002, 01:19 AM	#9
GMC JUNKIE TOO THE QUICKER FIXERUPER Join Date: Jul 2002 Location: Ok Posts: 615	mine howled then I put in straight lucas hub oil quieted it down. I had a guy tell me it was a worn pinion gear

07-25-2002, 11:34 PM	#10
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	new info, haha .. whenever i go around a corner it makes the noise the worst in thinking maybe bearing? or howabout the transfer case? anything go wrong in there? thanks alot matt __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

07-25-2002, 11:51 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Most likely it is too late, but have you checked the oil level in the rear?

07-25-2002, 11:52 PM	#12
jhwkns Registered Cruiser Join Date: May 2002 Location: Las Vegas NV Posts: 2,230	Check your axle bearings Matt. If that's all it is it's a cheap fix. Good Luck. __________________ I intend to live forever. So far, so good.

07-25-2002, 11:56 PM	#13
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	Somewhat of an easy test, At around 25-30mph turn left, then right. If the noise is loudest when your turn right, the left bearing has a problem. If the noise is loudest when you turn left, the right bearing has a problem. If you getting alot of howling from the rearend only on coast or decel, thats basicly the sounds of a worn rear-end. Its a combination of bearing (differential carrier and pinion) and gear wear creating too much backlash between the gears. Bearings typicaly make a rythmic growning sound that comes and goes. The backlash problem just creates a loud howl that stays constant and is related to speed. You if you catch it quick enough you can have someone that is experienced with differentials, replace all the bearings and check the teeth wear pattern.

07-26-2002, 12:05 AM	#14
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	the gear lube is full, its loud at coast, and at turning, maybe ill have a expert in town look at it thanks alot for your help guys! __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

03-12-2003, 05:22 PM	#15
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	very similar problem with my truck.... sometimes it "clunks" when shifting from park to reverse....kinda hops forward after shifting into drive ...... how long do you think i have before it goes ??? very smooth shift between drive, L1 and L2..... ive found it clunks less when i move it from park to nuetral and then into reverse instead of just park to reverse.....does that make sense ?? any input on the subject would be great thanks __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

03-13-2003, 04:00 PM	#17
AndrewDT Registered User Join Date: Jul 2001 Location: North Woods, Minnesota Posts: 196	"its in my rear end, its wholing or however you spell it when you let off the gas? " Matt, sounds like maybe you ate some bad chilie. __________________ '72 Suburban 4X4 "Save the Earth, kill yourself"



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