U-joint problem.
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Starting Member
Joined: Sep 2006
Posts: 244
U-joint problem.
Ok, so I recently got my truck back from the mechanic before he closed. He replaced both U-joints that were on the rear shaft. Now, I have noticed that when I accelerate, the whole truck vibrates, and it gets worse if I accelerate more. What could this be? I am going to take it back to him tomorrow, but I just wanted to know what could be the problem.
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Starting Member
Joined: Sep 2006
Posts: 244
RE: U-joint problem.
Well, actually this morning, I decided to run it at 50 mph and higher, to see if it would go away. It's really bad. The truck vibrates a lot. It does it even more when I hit 60 mph. I am going to take it back to him first thing in the morning on Monday. Also, when I am cruising(not giving it gas) at a low speed, it makes a loud, ugly sound as if some metal parts are moving. And as I said, the truck vibrates very much. my radar dectector and gps almost fell off the windshield from rattling so much. What do you guys think?
BF Veteran
Joined: Feb 2007
Posts: 3,335
RE: U-joint problem.
Sounds like he didn't index it properly. My guess is he didn't mark the driveshaft when he took it out so when he replaced it, the weights were in the opposite side (where they were stock) which is giving you that nasty vibration.
EDIT: I would have a hard time bringing it back there after he fixes his problem. The advice to drive it over 50 so that it will adjust...shady.
EDIT: I would have a hard time bringing it back there after he fixes his problem. The advice to drive it over 50 so that it will adjust...shady.
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Starting Member
Joined: Sep 2006
Posts: 244
RE: U-joint problem.
Yea, I've known him for quite a few years, and this is the first problem I have with him. But I will definitely go to him with an attitude. It didn't cost a penny either. He had replaced the heater core for me along with this joint, and it was not cheap at all. Do you think anything could get seriously damaged by running the truck in this condition? Thanks again for all your help.
BF Veteran
Joined: Jun 2006
Posts: 3,429
From: Vancouver. B.C. Canada
RE: U-joint problem.
ORIGINAL: S10Blazer
...this is the first problem I have with him. But I will definitely go to him with an attitude...
...this is the first problem I have with him. But I will definitely go to him with an attitude...
I'd go back to him and let him know that there's a major vibration problem and that a friend mentioned that the drivehaft may have been installed 180deg out ( not indexed), and that could throw the driveline out of balance.
Then see if he's willing to adjust the shaft for you. ( it only take a few minutes on a hoist).
Everyone can have a bad day and make a mistake. If he doesn't want to fix it, then go for the attitude!
I wouldn't run the truck with the vibration any longer than you have to and keep the speed down, then there should not be any damage to the truck.
Thread Starter
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Starting Member
Joined: Sep 2006
Posts: 244
RE: U-joint problem.
ORIGINAL: Chevy Lover
I wouldn't go with an attitude, if someone comes to me with with an attitude I just return the same to them.
I'd go back to him and let him know that there's a major vibration problem and that a friend mentioned that the drivehaft may have been installed 180deg out ( not indexed), and that could throw the driveline out of balance.
Then see if he's willing to adjust the shaft for you. ( it only take a few minutes on a hoist).
Everyone can have a bad day and make a mistake. If he doesn't want to fix it, then go for the attitude!
I wouldn't run the truck with the vibration any longer than you have to and keep the speed down, then there should not be any damage to the truck.
ORIGINAL: S10Blazer
...this is the first problem I have with him. But I will definitely go to him with an attitude...
...this is the first problem I have with him. But I will definitely go to him with an attitude...
I'd go back to him and let him know that there's a major vibration problem and that a friend mentioned that the drivehaft may have been installed 180deg out ( not indexed), and that could throw the driveline out of balance.
Then see if he's willing to adjust the shaft for you. ( it only take a few minutes on a hoist).
Everyone can have a bad day and make a mistake. If he doesn't want to fix it, then go for the attitude!
I wouldn't run the truck with the vibration any longer than you have to and keep the speed down, then there should not be any damage to the truck.
BF Veteran
Joined: Jun 2006
Posts: 3,429
From: Vancouver. B.C. Canada
RE: U-joint problem.
He doesn't need to take the driveshaft off. Just remove the rear u-joint clamps, push the driveshaft forward enough to clear the rear diff flange, rotate the diff 180 degrees, slide the driveshaft back into position and bolt it back up.
Indexed refers to the position of the driveshaft to the rear axle flange. most people will mark the flange and the driveshaft with paint before removing the driveshaft to make sure they put it back together the same way it came apart....for balance reasons.
Indexed refers to the position of the driveshaft to the rear axle flange. most people will mark the flange and the driveshaft with paint before removing the driveshaft to make sure they put it back together the same way it came apart....for balance reasons.
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