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| | | | Joined: Dec 2005 Posts: 1,026 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 1,026 | I have a friend who's working on a 72 long bed. He took out the two piece drive shaft because he preferred a solid one. He got one from a salvage yard and had it cut to fit his truck. Problem is when he goes over 40 mph it vibrates wildly. Another shop verified that the work was shoddy on the first drive shaft. He had recently bought a late 70's Buick for parts and as luck would have it, the drive shaft in it fit perfectly, but it vibrates at even lower speeds (around 25). He said that he had driven the parts car home and there was no problem with the shaft. Any ideas on this one? He did have 20" rims on all fours but switched back to the originals.
Robert C. If it's true what they say, "You learn from your mistakes," I'm a Genius in the making. 1950 3600 | | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | U-Joints perhaps. I assume there was no vibration before he removed the old shaft.
~Jim
| | | | | Joined: Dec 2005 Posts: 1,026 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 1,026 | He said he drove the parts car home and didn't have any problems.I asked him about the u-joints and said they were good.
Robert C. If it's true what they say, "You learn from your mistakes," I'm a Genius in the making. 1950 3600 | | | | | Joined: Jul 2008 Posts: 13 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2008 Posts: 13 | What is the pinion angle now? If it's more then -2 degrees he could have some vibrations.
Some people say I suffer from insanity, in reality, I enjoy every minute of it!
| | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | I am guessing that the two angles are not equal and opposite with the one piece setup. That would cause a problem as described. | | | | | Joined: Feb 2009 Posts: 400 'Bolter | | 'Bolter Joined: Feb 2009 Posts: 400 | Could be that the driveshaft is out of time with the rearend and trans. Meaning that it needs to be clocked 1/2 turn out from where it is now. | | | | | Joined: Jan 2010 Posts: 378 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 378 | I agree with PapaJ, My 1990 Chevy was taken to the local Chevy dealer and a "new" rebuilt trans installed. When I took it home, around closing time, it vibrated at a certain speed. Don't remember what speed but it was low. I took it back the next morning and was told there was nothing wrong. Well two dealers later a shop manager, who happens to own a beautiful 1955 Chevy car, rode with me and told me to go on and bring the speed up. Around 80 to 90 mph. Bottom line. drive shaft was 1/2 turn out. Fixed the issue and no trouble since. | | |
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