Subject: Shudder And/or Hard shifting Into 1st Gear Or Reverse Vibration On launch (With Excessive Crankshaft End Play)
Models: 2014-2015 Chevrolet Corvette

Built with an 6.2L, LT1, LT4 engine and auto or manual transmission
This PI was superseded to update Models. Please discard PIP5248.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern

Customers may have a concern of a Shudder and/or Hard shifting into 1st gear or Reverse for manual transmission.
Auto transmission it could be a vibration on takeoff or clunk noise.

Recommendation/Instructions

This concern could be caused by excessive crankshaft end play Check to determine if the crank shaft end play is within specification 0.0015–0.0086 in (0.040
–0.220 mm).
If end play is found to be out of specification, remove engine and inspect for possible Crankshaft thrust bearing and/or crankshaft for wear.
Check the following to Determine if there are any Crankshaft Thrust Bearing concerns
Inspect oil pan for possible evidence of bearing debris
If bearing debris is found in the oil pan and all Thrust Bearings are found to be worn on both the front and/or rear of the thrust surface, refer to latest version of PIP5230
SI Diagnostics Determines The Engine Repair requires Crankshaft Replacement

If both the main bearings and connecting rod bearings show no signs of significant wear (surface finish is not dull)
Main Bearings show no signs of scratching or smearing that would indicate a possible spun bearing (rotated in the Main Cap).
Replace crankshaft, thrust bearing and main bearings
For this repair the oil tank with lines and oil cooler are both required to be replaced if equipped.

Note:

Be sure to follow all documents for DSA replacement