Transmission jumping from park to drive

[Dieselcamino]

Hey everyone, slightly annoying problem with my 2018 Silverado 5.3 6spd.  (35k miles)  when stone cold and I go to drive or reverse for the first time it does a bit of a jump into the gear. After that one time it's good for the day. If I hold the brake enough it's almost unnoticeable but if someone else drives it it seems funny. Is this something resetting the computer could help? Other than this is drives great. 

[Dieselcamino]

Should also add the fluid was changed at 30k and is at the right level now. 

[rav3]

Was it happening before the change? Or after?

[Dieselcamino]

Been noticing it more lately, it's not super hard so I don't always notice it

[rav3]

What brand fluid did you use for the change? Was it a drain and file or did you have it flushed?

[Dieselcamino]

Drained the pan, new filter, ran for a day and drained pan again. Filled with Valvoline max life.  Also deleted the trans thermostat when I purchased it at 14k miles. Temperature was never really an issue for me though

Edited July 11, 2023 by Dieselcamino

[rav3]

Sounds like you're doing the right things. I did the same on my '17 Silverado with 6L80 transmission @ 32k. I had a similar shift in my transmission when 'cold' or first drive. I personally think it has something to do with the pressure shift valve(s) but I'm no transmission guy, just an old retired plastics tooling engineer. What I did to help that shift (not saying it's correct) but I added a bottle of LubeGard transmission fluid additive, either the Platinum or Red bottle. It won't hurt anything to my knowledge but have been told by several 'old transmissions mechanics, that this helps the seals & makes them "more slick" so to speak.

Anyway, that's my store & what I do/did.

Good luck & keep the forum updated on your progress.

[Dieselcamino]

It's somewhat nitpicky I guess compared to the stories I hear on these trans. But little things annoy me. Hard to problem solve when it only happens once a day first thing. 

[rlcole321]

when cold starting, how long does it take for the RPM's to come down?, maybe the RPM's are a little too high when you put it in gear when cold.....

[Dieselcamino]

Ive tried waiting 30 seconds or so and still it jumps in drive or reverse 

[GMCustomerService]

On 7/10/2023 at 7:32 PM, Dieselcamino said:

Hey everyone, slightly annoying problem with my 2018 Silverado 5.3 6spd.  (35k miles)  when stone cold and I go to drive or reverse for the first time it does a bit of a jump into the gear. After that one time it's good for the day. If I hold the brake enough it's almost unnoticeable but if someone else drives it it seems funny. Is this something resetting the computer could help? Other than this is drives great. 

This is certainly not what we like to hear, Dieselcamino.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 2018 Chevrolet Silverado's transmission. To do so, please send an email to [email protected] with ATTN: Dieselcamino/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s Privacy Policy, please visit https://www.gm.com/privacy-statement.html. The information you provide may be monitored and recorded and is subject to the GM Privacy Statement.
 
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Your privacy is important to General Motors. This Privacy Statement addresses the personal information GM collects and how GM handles that personal information.
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[mikeyk101]

32 minutes ago, GMCustomerService said:

This is certainly not what we like to hear, Dieselcamino.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 2018 Chevrolet Silverado's transmission. To do so, please send an email to [email protected] with ATTN: Dieselcamino/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s Privacy Policy, please visit https://www.gm.com/privacy-statement.html. The information you provide may be monitored and recorded and is subject to the GM Privacy Statement.
 
Privacy Statement | General Motors
Your privacy is important to General Motors. This Privacy Statement addresses the personal information GM collects and how GM handles that personal information.
www.gm.com

@GMCustomerService I was wondering where you went and how long it would be until you showed back up again!!! Glad to see you posting again with your same old cut and paste useless attempts at providing help!!!