1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,321 Posts
After a long drive, the differentials can be hot to the touch.
What did the shop mean when they said that the connection from the driveshaft to the differential was too tight? Were they indicating the rear u-joint or pinion gear preload? Gear preload is set at the factory and usually gets better as the bearings wear in. The gears will turn with resistance. That's normal.
A vibration under the floor does sound driveshaft/u-joint related. Shaft imbalance would be a consistent 'shudder', it wouldn't come and go and it would likely happen at certain speeds.
I would ask the dealer for a 2nd diagnosis. Did they actually witness the vibration? If not, they would be guessing.
Go for a road test with the technician and point out the shake. You can ask the service advisor if they can waive the 2nd diagnostic fee as you are back with the same complaint. It may have to be OK'd by the service manager, but that's OK as it may get him involved in your concern and get you an answer.
What did the shop mean when they said that the connection from the driveshaft to the differential was too tight? Were they indicating the rear u-joint or pinion gear preload? Gear preload is set at the factory and usually gets better as the bearings wear in. The gears will turn with resistance. That's normal.
A vibration under the floor does sound driveshaft/u-joint related. Shaft imbalance would be a consistent 'shudder', it wouldn't come and go and it would likely happen at certain speeds.
I would ask the dealer for a 2nd diagnosis. Did they actually witness the vibration? If not, they would be guessing.
Go for a road test with the technician and point out the shake. You can ask the service advisor if they can waive the 2nd diagnostic fee as you are back with the same complaint. It may have to be OK'd by the service manager, but that's OK as it may get him involved in your concern and get you an answer.