4L60e Transmission 1st Gear Downshift

00Silverado4x4 · February 27, 2013

For all of us 4L60e trans owners,

As I have driven my truck for almost 7 years now I have noted that I can actually feel and see (tach gage) when my trans downshifts to low gear upon stopping. Since it has always done this I never worried about as it doesn't seem to affect anything. My only other experience with this specific trans was my previous Sonoma (2004) which I don't remember this happening. So what I am wondering is if other 4L60e trans owners have noticed this on their vehicle (trucks or cars)? It's not a violent downshift but it is noticeable, but only when normal or slow stopping. It doesn't do this in quick/panic stopping (or just don't notice because I'm trying to avoid an accident or the red light snuck up on me.)

I don't think it's a problem, just something that came to mind one day.

oldscsc · February 27, 2013

I believe the spec is 1-2 at 12 mph and 2-1 at 8 mph. Completely normal, no issues. I feel it...I'd be worried if I didn't.

KMGZ400 · February 27, 2013

yeah after driving and owning many 4L60's it seems they all do it, just the nature of the beast

and as the trans gets worn out, it gets rougher and rougher, at about 140k i feel it pretty good now

GMCustomerService · February 28, 2013

06SierraZ71,

Looks like you have some good experiences here. Let me know if you need anything in the future. Thank you.

Tricia, GM Customer Service.

kstruckcountry · February 28, 2013

If I watch it closely I'll notice it. But most of the time I don't.

00Silverado4x4 · February 28, 2013

06SierraZ71,

Looks like you have some good experiences here. Let me know if you need anything in the future. Thank you.

Tricia, GM Customer Service.

Thanks Tricia, yes I've had some really good experience with all the GM products I've owned. Everytime I've strayed away, I'm reminded why I should stay where I am. The Sierra is currently at 104k miles and couldn't be happier. I honestly feel this is the truck that I'll be teaching my daughter to drive in...several years from now.

GMCustomerService · February 28, 2013

Thanks Tricia, yes I've had some really good experience with all the GM products I've owned. Everytime I've strayed away, I'm reminded why I should stay where I am. The Sierra is currently at 104k miles and couldn't be happier. I honestly feel this is the truck that I'll be teaching my daughter to drive in...several years from now.

Thank you for the reply. It is good to hear such positive feedback. We appreciate the loyalty. Let me know if you need anything in the future.

Tricia, GM Customer Service.

aflesch · February 28, 2013

My 09 does it very noticably. It's kind of annoying. It isn't anything a BBP tune won't take care of though.

freddie02f · March 10, 2013

I have a 2009 GMC sierra slt 5.3 . What transmission do I have ??

Chris · March 10, 2013

look in the glove box on the sticker, If you have code M30 its the 4L60E

freddie02f · March 10, 2013

It doest have that code a lot of numbers

aflesch · March 10, 2013

There should only be one code that starts with M. That is your transmission. Find out what it is an use the RPO Code Lookup on the Main Page to see what you have.