Jump to content

ws6firebirdta00

TCM Location 2018 A8 Sierra?

Recommended Posts

I have not had much luck confirming the location of the 8 speed TCM for the 2018 Sierra.

 

Does anyone have any descriptions or pictures? I have seen a few older threads stating it may be in the transmission, hoping wherever it is access ins't a pain.

 

Thanks.

Share this post


Link to post
Share on other sites

Inside the trans.

Share this post


Link to post
Share on other sites

On the firewall. On the driver's side of the master cylinder. Very simple to remove.

Share this post


Link to post
Share on other sites

If I get a minute I'll go take a pic of mine.

Share this post


Link to post
Share on other sites

@Denali_King, I'd like to see a pic of the TCM you're referencing.  The last time I knew they were all inside the trans like @tbarn said.  They've been there since the 6-speeds.  They aren't serviceable separately to my knowledge.

Share this post


Link to post
Share on other sites

rps20181021_210724.jpg

Mine has been unlocked by hptuners and tuned.

Edited by Denali_King
  • Like 1

Share this post


Link to post
Share on other sites

My bad. Shouldn't make assumptions. 6 speeds are in the trans. 8 speeds on the firewall

Share this post


Link to post
Share on other sites

Hptuners is now offering new TCM's already unlocked for $400.  Beat the downtime and have your stock 1 unaltered.

Share this post


Link to post
Share on other sites

Do you have a link to that? I don’t see it anywhere. I thought they only modified one you sent in.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


×

Important Information

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