TSB's

Vette Rattle

Some owners of a 2014-2019 Chevy Corvette equipped with an automatic transmission may comment about a rattle noise at the front of the vehicle when the engine is running at slower engine speeds. This condition may be caused by a deformed propshaft coupler, which may move the driveline support assembly’s front input shaft bearing out of position.

If the bearing/slinger has been validated to be the cause of the noise and/or found to be pushed rearward more than ¼-inch, continue with Propshaft Replacement procedure in the service manual. Verify that the propshaft hub clamp bolt is properly torqued.

If the noise is found to be coming from the rear of the engine, raise the vehicle and remove the engine bellhousing rubber inspection plug. Inspect the flex plate. If an LT1 engine flex plate is currently installed, Chevy says that “it is crucial” that the LT4 flex plate is to be installed.

If an LT4 flexplate is already installed, remove the driveline support assembly (DSA). Remove the propshaft from the DSA and inspect the rubber coupler for damage. Inspect the crankshaft endplay. If endplay exceeds specification the crankshaft thrust bearing should be inspected.

Inspect to see if the front bearing/slinger is flush with the housing (A). If the bearing/slinger has been found to be the cause of the noise and has been pushed rearward more than ¼-inch (B), continue with propshaft replacement.
<p>Inspect to see if the front bearing/slinger is flush with the housing (A). If the bearing/slinger has been found to be the cause of the noise and has been pushed rearward more than &frac14;-inch (B), continue with propshaft replacement.</p>

LT1 flex plate (A) and LT4 flex plate (B). Note that the LT4 flex plate features a welded ring gear.
<p>LT1 flex plate (A) and LT4 flex plate (B). Note that the LT4 flex plate features a welded ring gear.</p>

Post a comment
 

Comments (0)

 

Post a Comment

Submit
Subscribe Today

Subscribe to Auto Service Professional

Sign up for a FREE subscription to Auto Service Professional magazine

Subscribe