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| | | | Joined: Jun 2012 Posts: 51 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2012 Posts: 51 | My original three speed was rebuilt at a shop in Corona, CA 'cause it was popping out of high gear going downhill. Charged me 600.00 for the 'reman' transmission with a one year warranty, but it sometimes tends to gall during shifting and I have a growl that starts about 50 and goes to 65 before it smoothes out. makes my mirrors vibrate! I hear what I think is bearing noise sometimes and I'm wondering just what I got for my 600. U joint is new, new pilot bushing, new engine. Growl does not appear to go away when I let off the gas so I don't think it is the rear end. I can live with it but it is loud and annoying around 50 to 60 mph. Anyone got an idea? This is my 46 1/2 ton and I drive it almost everyday. | | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | Does the sound change if you push in the clutch at speed?
How about slipping it into neutral with clutch in and then out at speed? | | | | | Joined: Jun 2012 Posts: 51 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2012 Posts: 51 | | | | | | Joined: Jun 2012 Posts: 51 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2012 Posts: 51 | When at speed I pushed in the clutch, foot off the gas, and the growl went away. What does this mean? | | | | | Joined: Aug 2004 Posts: 1,417 ODSS Lawman | | ODSS Lawman Joined: Aug 2004 Posts: 1,417 | Get the RPMs up while stationary. If you hear growl it's on the engine. If not, it's in the driveline.
SWEET Sergeant At Arms: Old Dominion Stovebolt Society BUNS?!?!?!Where we're going, we don't need no buns.....1950 GMC 450 1951 Chevy 1/2-TonThe GreenMachineIn the Stovebolt Gallery | | | | | Joined: Jun 2012 Posts: 51 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2012 Posts: 51 | I did rev it up with the clutch in and it was there. Fresh rebuild and supposed to be balanced. Would it be the flywheel? I can live with it but wanted it to be right! | | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | You have eliminated the transmission and everything behind it.
An out of balance on the engine would be a vibration not a "growl".
You should be able to reproduce it by revving the engine with the truck parked.
I did have one with an odd "rumble" with engine revs. Was a bad motor mount that transmitted engine vibration into the frame. | | | | | Joined: Jun 2009 Posts: 1,596 'Bolter | | 'Bolter Joined: Jun 2009 Posts: 1,596 | A growl when you rev it up can be a sign of a bearing going. I would take the engine out and check the mains, to start. | | | | | Joined: Jun 2012 Posts: 51 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2012 Posts: 51 | It seems to be more of a vibration than a growl...my mirrors vibrate causing a blurred image but only at 50 to 60 mph.
| | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | If you slowly increase the engine RPMs with the truck parked, you should create the growl/vibration when you match the 50 mph engine speed. That would be around 3000, 3200 rpm. Watching and listening to the engine may give you a clue.
Possibilities:
Vibration damper, flywheel, pressure plate.
More obscure, iron pistons with a crank balanced for aluminum or mixed aluminum and iron pistons, one spark plug misfiring under load. | | | | | Joined: Jun 2012 Posts: 51 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2012 Posts: 51 | Thanks Jim, I'm hoping i don't have to pull the engine again...but I will if I have to. | | |
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