Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Recommended Posts

Multiple time i have experienced a what feels like a delayed shift from 1st to 2nd when leaving my house.  It usually happens the first time I drive my truck for the day and just feels like its shifting real slow, no kick or anything like that.  A couple days ago, in the same situation, I had a very hard shift from 1st to 2nd, and from 2nd to 3rd.  Hard enough to spin the tires on my dirt road, I was barely pressing the gas and it felt like I ad a shift kit installed and the gears where slamming together.  The hard shift has only happened one, but the delayed shifting is every couple days.  Any ideas what it could be?


For reference, I have a 5.3 w/ 8 spd transmission.

Edited by NDIinspector
Link to post
Share on other sites
  • 1 month later...

Some forum members have posted about transmission & shifting concerns in the general section (instead of the engine / driveline / exhaust section). One of those is below and has a lot of info. And a search on this site will bring up multiple other posts as well.



Occasional harsh downshifts during deceleration = TSB 19-NA-244. Resolution is reprogram the TCM.

Shake / shudder during light acceleration = TSB 19-NA-121. Resolution is to flush fluid and install latest high perf. fluid.






Edited by Chevrolet1
  • Thanks 1
Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.