Originally Posted by Lewi
terrys toughness wont go any higher.
ive completed the main story and have been doing gang wars but everyone elses toiughness goes up excpet for his
clays toughness is at 100 as well btw
Toughness only goes up if he survives the gang war, check the summary at the end of each war. All you can do is to keep doing them but try and protect Terry as much as you can and make sure he doesn't get in your own line of fire.
It's a shame you've finished the main story as I found that the best way of getting their toughness up was to always call Terry and Clay as backup once they were available.