GM 6.6 gasser and 10-speed opinions?

[21_6.7f450]

I believe you can stiffen them up with tuning from Blackbear. I'd like to hear from Cline if that actually helps.

 

[AZjeff]

6.6/6 speed here on the return run of a 4500 mile Az-Pa-Az trip and have seen mpg on 400 mile fill ups run from 17.3 to 15.3 mostly at 75-80. 400 pounds cargo cargo going less coming back. Just an FYI for highway running mpg. 20k miles towing a 6500 lb travel traijer at 65 mpg is exactly 10. Wish I had the 10 spd but not enough to trade.

 

[clinebarger]

I believe you can stiffen them up with tuning from Blackbear. I'd like to hear from Cline if that actually helps.

GM 10 speed tuning (TCM) requires a unlock service, Programming, And License/Credits. Good amount of cash to have a "tuner" burn your transmission up, Probably only a hand full of tuners in the country is proficient.

I'm 10 years into GM 6L tuning & can make that dog hunt!

 

[21_6.7f450]

So Cline said it can be done...in the right hands. Good to know.