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12-22-2004, 03:28 PM
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#1 |
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Registered User
Join Date: Aug 2004
Location: Overland Park, KS
Posts: 79
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Rear U-joint problem
My son has a 72 LWB GMC with a 350 / 350 auto. The rear joint lasts about 1000 to 1500 miles. The truck has just developed this problem. With a new u-joint in place no vibration at highway speeds. You can tell when it starts to go bad it begins to vibrate on highway. It has gone thru 3 now. The truck has not been in an accident or high centered. Any idea's?....
Thanks, Parrish |
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12-22-2004, 03:46 PM
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#2 |
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The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,468
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MIGHT BE DRIVESHAFT OUT OF BALANCE, HAVE A LOCAL MACHINE SHOP CHECK IT
 IS TRUCK LOWERED USING BLOCKS, COULD BE THE REAR PINION ANGLE IS OFF I'M SURE YOU WILL GET MORE OPINIONS WHEN OTHERS CHIME IN 
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T Last edited by LUV2XCLR8; 12-22-2004 at 03:48 PM. |
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12-22-2004, 03:49 PM
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#3 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Front , middle or rear? Truck been lowered or raised?
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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12-22-2004, 04:02 PM
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#4 |
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Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Add another question. Single or two piece shaft?
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Fred There is no such thing as too much cam...just not enough engine. 
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12-22-2004, 05:31 PM
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#5 |
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Registered User
Join Date: Aug 2004
Location: Overland Park, KS
Posts: 79
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It is the stock height for 1/2 ton, 2 piece drive shaft. I have looked at the driveshaft and does not look like any weights are missing. It is the u-joint that connects the rear end to the drive shaft.
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12-22-2004, 06:15 PM
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#6 |
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Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,261
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Even with the weights there, the drive shaft can be out of balance, slightly bent etc. I would tend to take it to a "big truck spring/driveshaft" place. Take the whole driveshaft---with center bearing and have them check it out for true, balance, bearings etc. They will find any problem and get it right. They also tend to be pretty fair on prices for labor and parts too.
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12-22-2004, 06:25 PM
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#7 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Another thing is that you may be over tighting the straps on u-joint. This will tend to make the cups out of round which will eat up a joint in a hurry.
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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