Automatic transmission jumping out of gear?

Also, have your ambient temperatures dropped significantly? Have you ran the tune in cold weather prior? 40⁰ F, or less.

 

Gonna try a new tune or going back to stock ASAP.

Regarding ambient temps, it's a little cooler out here lately but not a huge difference.

 

Hit up @Kevinpd325 if you wanna give Blackhawk a go.

Good luck either way. Keep us updated if it goes away or you find the issue.

 

Will do, thanks man.

 

If it were me, I'd have my tuner flash me back to stock to eliminate variables.

 

Update:

Flashed to stock today and went out to test it in the dirt, since the lower traction should be less of a shock to the drivetrain than chirping 35s at 70 MPH on pavement.

Could not replicate the problem, no matter how hard I drove. Multiple passes floored from a standstill up to the 93 MPH top speed limiter, both leaving it in D and auto-stick shifting at high revs.

I'll ask my tuner to look at what's making it shift the way it was. Again, super strange that it just started after having the tune with 35s and 5.29 gears for thousands of miles.

SO glad I don't need to dig into the trans or replace it!

 

Great news!
Good luck figuring it out. Keep us in mind if they cannot assist.

 

Thanks, I'll keep that in mind. Really appreciate all the info and feedback!

 

Wow. Great you finally got sorted it out. Tnx for the update