tranny or u-joint problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tphsmith · 01-30-2004, 08:36 PM

transmission? u-joints ?

I drive an 81 1/2 ton with straight 6 in it. I assume the transmission maybe is a 350. well when I put it in gear it makes a loud clunk noise. I thought ok look at the u-joints. I dropped the drive shaft. and I have not yet removed the u-joints from the drive shaft yet but the seals look good they are not dried out. the joints I grab in my hand while the joints are still on drive shaft and I have drive shaft on the work bench. I dont see any unusual movement from the u-joints. so I started the truck with out drive shaft in and shifted from reverse to drive no noise sounds good. but when I put it in park with the motor running it makes a noise that I dont like................ HELP

walker · 01-30-2004, 10:10 PM

It may be play in your rear gears. Jack the rear up and turn the pinion back and forth by hand to see how much play is in it.

Deltaskier · 01-30-2004, 10:13 PM

What he said.

Chevy67Tk · 01-30-2004, 10:22 PM

If your hearing a ratcheting sound when you put it in to park with the engine running and no drive shaft, that is the parking paw trying to engage on to the output carrier while it is still spinning. I wouldn’t do this too often, as there is a chance of shearing off the paw.

01-30-2004, 08:36 PM	#1
tphsmith still buypickupparts Join Date: Sep 2003 Location: charlotte Posts: 637	tranny or u-joint problems transmission? u-joints ? I drive an 81 1/2 ton with straight 6 in it. I assume the transmission maybe is a 350. well when I put it in gear it makes a loud clunk noise. I thought ok look at the u-joints. I dropped the drive shaft. and I have not yet removed the u-joints from the drive shaft yet but the seals look good they are not dried out. the joints I grab in my hand while the joints are still on drive shaft and I have drive shaft on the work bench. I dont see any unusual movement from the u-joints. so I started the truck with out drive shaft in and shifted from reverse to drive no noise sounds good. but when I put it in park with the motor running it makes a noise that I dont like................ HELP

01-30-2004, 10:10 PM	#2
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	It may be play in your rear gears. Jack the rear up and turn the pinion back and forth by hand to see how much play is in it. __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold

01-30-2004, 10:22 PM	#4
Chevy67Tk Registered User Join Date: Mar 2003 Location: PA Posts: 349	If your hearing a ratcheting sound when you put it in to park with the engine running and no drive shaft, that is the parking paw trying to engage on to the output carrier while it is still spinning. I wouldn’t do this too often, as there is a chance of shearing off the paw. __________________

01-30-2004, 10:13 PM	#3
Deltaskier Registered User Join Date: Jan 2004 Location: Montgomery, TX Posts: 73	What he said.



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