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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Feb 2000 Posts: 5,245 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,245 | Waiting on the report from the driveline shop, but I was going to say the u-joints out of phase.
What are the angles, tail shaft to driveline, and driveline to pinion? Both these should be in the area of 1/2 to 3 degrees, up to 4 or 5 is OK, but 3 is ideal. No other angle matters. Out of phase u-joints can't cancel out each other and will create vibrations. Same with different angles at each end, just not nearly as bad as out phasing. A carrier bearing on two-piece driveline can also make noise and vibration.
A bad pinion bearing can make a lot of noise.
With low gear ratio, the engine is now working much hard to pull the truck at a lower rpm and higher speeds. Check the tune up and spark plug condition, you might be feeling a rough running engine under a load. | | |
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