First time needing help, any help appreciated. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Cw72gmc · 11-08-2009, 11:51 PM

Today was a beautiful day so I decided to take my pickup up the canyon. 72 gmc 3/4 350 4 spd manual....

... on the way down i used the tranny a lot so I didnt over heat my brakes.

After coming down the canyon almost all the way home my truck started howling/grinding with the clutch half way out on accel. If I'm dead stopped starting out in 2 with the clutch half way out whine/chirping if i give it gas with clutch half way out the noise stops and if I let clutch out further it engages and the truck is driveable I'm wondering if this sounds like a wearing down pressure plate. I need to drive this truck and am wanting to make sure I'm not doing any damage

68gmsee · 11-09-2009, 12:05 AM

Possibly the throw out bearing. Either way, you'll have to yank the tranny out.

A good way to check if it's the clutch wearing out is to put it in 3 gear and slowly try to move the truck. If the clutch is worn it will slip. If it's good you'll should be able to move the truck.

unclewatts · 11-09-2009, 01:44 AM

Sounds to me like the throw out bearing but I could be wrong.

Cw72gmc · 11-09-2009, 02:03 AM

Just letting you all know I went out and messed with it a bit while I parked it in the garage for the night. Its more of a loud howling...its as loud in the truck as it is out. If I give it throttle it stops or let the clutch out further it stops. Does it still sound like a throw out bearing? And if it is in fact the bearing is it still safe to drive for a bit?

Farmstore34 · 11-09-2009, 02:29 AM

It certainly sounds like the throw-out bearing. It can easily become destroyed if it's seizing up, leaving you stranded. I've had that happen!

Cw72gmc · 11-09-2009, 02:31 AM

Quote:

Originally Posted by Farmstore34

It certainly sounds like the throw-out bearing. It can easily become destroyed if it's seizing up, leaving you stranded. I've had that happen!

Ok Thanks, If it does fail completely or I continue to drive on it will it mess up any of the other internals?

haysonj · 11-09-2009, 07:50 AM

Quote:

Originally Posted by Cw72gmc

Ok Thanks, If it does fail completely or I continue to drive on it will it mess up any of the other internals?

It can wear through the clutch and you will not be able to disengage the engine. I would fix before it destroys the clutch.

CCCC · 11-09-2009, 11:18 PM

If you are getting the noise in any and all forward gears and noise starts and stops due to a particular clutch pedal position - and is affected by engine revs - it almost surely is the release bearing ('throw out"). It probably has gone dry and started to seize on the trans shaft. This bearing is an actuator that rides on the trans shaft, is operated by the clutch fork (end of your pedal mechanism) and slides forward into the spring setup to disengage the clutch plate and backward to release the spring and let the engage. If the bearing seizes it may wear the shaft, but more likely will wear the fork contacts and maybe the spring tips. Not a bad job - merely have to remove the trans - good chance to check other clutch components while you are at it. Maybe replace all of them while you have it out. Probably just need to bite the bullet and start turning wrenches - or go to a good/honest clutch shop. Good luck - not a real bad one.

11-08-2009, 11:51 PM	#1
Cw72gmc ~Craig~ Join Date: Mar 2009 Location: Kearns Utah Posts: 169	First time needing help, any help appreciated. Today was a beautiful day so I decided to take my pickup up the canyon. 72 gmc 3/4 350 4 spd manual.... ... on the way down i used the tranny a lot so I didnt over heat my brakes. After coming down the canyon almost all the way home my truck started howling/grinding with the clutch half way out on accel. If I'm dead stopped starting out in 2 with the clutch half way out whine/chirping if i give it gas with clutch half way out the noise stops and if I let clutch out further it engages and the truck is driveable I'm wondering if this sounds like a wearing down pressure plate. I need to drive this truck and am wanting to make sure I'm not doing any damage

11-09-2009, 12:05 AM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: First time needing help, any help appreciated. Possibly the throw out bearing. Either way, you'll have to yank the tranny out. A good way to check if it's the clutch wearing out is to put it in 3 gear and slowly try to move the truck. If the clutch is worn it will slip. If it's good you'll should be able to move the truck.

11-09-2009, 01:44 AM	#3
unclewatts 70 Chevrolet=Obsession Join Date: Jun 2009 Location: nice ca Posts: 1,067	Re: First time needing help, any help appreciated. Sounds to me like the throw out bearing but I could be wrong. __________________ I'm Just like my truck. Old, Ugly and Grouchy. Except my truck starts easily in the morning and doesn't smoke! IT'S NOT EASY BEING GREEN! -Kermit the frog 1970 Chevrolet C-10 Longbed Stepside : 350, Muncie M20, 3.08 GM corp. positraction Forest green exterior/light green interior(Where all my money goes) 1996 Toyota Corolla (Parts runner)

11-09-2009, 02:03 AM	#4
Cw72gmc ~Craig~ Join Date: Mar 2009 Location: Kearns Utah Posts: 169	Re: First time needing help, any help appreciated. Just letting you all know I went out and messed with it a bit while I parked it in the garage for the night. Its more of a loud howling...its as loud in the truck as it is out. If I give it throttle it stops or let the clutch out further it stops. Does it still sound like a throw out bearing? And if it is in fact the bearing is it still safe to drive for a bit?

11-09-2009, 02:29 AM	#5
Farmstore34 Registered User Join Date: Mar 2007 Location: Oregon Posts: 109	Re: First time needing help, any help appreciated. It certainly sounds like the throw-out bearing. It can easily become destroyed if it's seizing up, leaving you stranded. I've had that happen!

11-09-2009, 11:18 PM	#8
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 734	Re: First time needing help, any help appreciated. If you are getting the noise in any and all forward gears and noise starts and stops due to a particular clutch pedal position - and is affected by engine revs - it almost surely is the release bearing ('throw out"). It probably has gone dry and started to seize on the trans shaft. This bearing is an actuator that rides on the trans shaft, is operated by the clutch fork (end of your pedal mechanism) and slides forward into the spring setup to disengage the clutch plate and backward to release the spring and let the engage. If the bearing seizes it may wear the shaft, but more likely will wear the fork contacts and maybe the spring tips. Not a bad job - merely have to remove the trans - good chance to check other clutch components while you are at it. Maybe replace all of them while you have it out. Probably just need to bite the bullet and start turning wrenches - or go to a good/honest clutch shop. Good luck - not a real bad one. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.