Last week I used my Autocal v3 and captured the logs and tune files for
@BlackBearPerf to tune the Suburban 3500 HD. Paid my money for the new tune and sent the files off last night and received confirmation that I'm in the queue. They're the only ones I trust to do it after having such great results with their tunes, over the long haul, on our two Yukon XL Denali's.
I asked them to keep it compatible with 87 octane gas, so I'm not expecting a big performance bump, but the transmission shifts on this thing are sooooo soft in the service of comfort, that I worry about the transmission's longevity while towing. Looking forward to seeing what they cook up for it. I'll let y'all know what the results are.
Pic from our camping trip the weekend before last.
View attachment 443037