Supporting Vendors / Dealers - Advertising - Shop

2015 - 2018 Corvette Z06: GM TechLink: Hard Shifting into 1st Gear or Reverse

Hard shifting conditions when shifting into 1st gear or Reverse may be found on some 2014 - 2018 Silverado, Sierra and Corvette models equipped the 4.3L V6 engine, 5.3L V8 engine or 6.2L V8 engine (RPOs LV3, L83, L86, LT4) and 2015-2018 CTS-V, Escalade, Tahoe, Suburban, Yukon; and 2016-2018 Camaro models equipped with the 5.3L V8 or 6.2L V8 engine (RPOs L83, L86, LT4).

On Silverado, Sierra, CTS-V, Escalade, Tahoe, Suburban, Yukon, and Camaro models, when shifting the automatic transmission into Drive or Reverse, a clunk sound may be heard.

On Corvette models only, it may be difficult to shift into 1st gear or Reverse with a manual transmission or there may be a vibration on takeoff or a clunk noise when shifting into Drive or Reverse with an automatic transmission.

Crankshaft End Play

The hard shifting conditions may require replacement of the crankshaft or thrust bearing. Before replacing any components, check for excessive crankshaft end play. Crankshaft end play clearance should be within a specification of 0.0015–0.0086 in. (0.040–0.220 mm).

Crankshaft Wear

If end play is found to be out of specification, remove the engine and check for possible crankshaft thrust bearing or crankshaft wear. The crankshaft and bearings should not show signs of excessive wear. (Fig. 10) Inspect the thrust bearing for wear on one side and the crankshaft on the mating surface.

Fig. 10

If wear is evident — the three vertical channels may be worn off — replace the connecting rods, main bearings, thrust bearing and crankshaft.

TIP: On engines with a dry sump oil system, the oil tank and lines, and the oil cooler (if equipped) (Fig. 11), should be replaced when repairing the engine.

Fig. 11

– Thanks to Richard Renshaw

0 (0)
Article Rating (No Votes)
Rate this article
Attached Files
There are no attachments for this article.
There are no comments for this article. Be the first to post a comment.
Security Code Security Code
Related Articles RSS Feed
2015 - 2017 Corvette: Service Bulletin: #PIP5437B: 8L45 8L90 Diagnostic Tips for Harsh Shifts and Delayed or Harsh Garage Shift Engagements
Viewed 1230 times since Fri, May 26, 2017
2014 - 2016 Corvette: Service Bulletin: Surge Misfire Feeling Sensation During Highway Steady State Driving - (Jun 6, 2016)
Viewed 1671 times since Wed, Jun 8, 2016
2015 - 2017 Corvette Z06: Service Bulletin: #PIP5395B: Ticking Rattle Or Buzz Noise Heard The Best In The Passenger Compartment - (Mar 20, 2017)
Viewed 2381 times since Tue, Mar 21, 2017
2015 - 2017 Corvette: Service Bulletin: #15-NA-002: Information on Fuel Odor and/or Fuel Leaks from Underhood SIDI Pipes Between High Pressure Pump and Fuel Rails
Viewed 707 times since Wed, Jul 12, 2017
2000 - 2018 Corvette: Service Bulletin: #PIP4925A: SES Light with Fuel Trim and or Oxygen Sensor Codes - (Mar 21, 2017)
Viewed 698 times since Wed, Mar 22, 2017
2014 - 2015 Corvette: GM TechLink Article: Extended Cold Crank with Direct Injected Engines
Viewed 3475 times since Mon, Jun 30, 2014
2014 - 2017 Corvette: Service Bulletin: #PIP5179C: Extended Crank Cold With DI (Direct Injected) Engines - (Apr 5, 2017)
Viewed 597 times since Thu, Apr 6, 2017
2017 Corvette: Service Bulletin: #16-NA-404: Harsh Shift, Delayed Shift, unwanted Downshift, Transmission Stuck in One Gear, Erratic Shifting, Hesitation or Have a Malfunction Indicator Lamp (MIL) Illuminated
Viewed 845 times since Sat, Apr 8, 2017
C7 Corvette: Service Information: Transmission Control Lever Knob Replacement
Viewed 861 times since Fri, Aug 5, 2016
2016 Corvette: Recall: 16038 Transmission Oil Cooler Line in Contact with Body Stud
Viewed 971 times since Mon, Jan 23, 2017