Here are my thoughts on how Ty and the others react to having a crush and how they would act around that crush.
General: I think that if the others knew that one of the Trux had a crush they'd probably tease them non stop. More so when the crush isn't around but they will do it in front of them too- just not as obviously. They'd also be huge shippers (*Come on, tell them already!*) and supporters, being there in case it doesn't turn out well.
Ty: He's the kind that gets to know someone before developing a crush. He's friendly to everyone and that's how it starts- with friendship.
Then maybe they do something like an impressive stunt/move or do a self-less act that makes him go "whoa." From then on he is more attracted to them and trying to do more things with them. Although he sometimes comes off as awkward.
Ty is also the kind to show off. With just about anything. "Hey ____ , did you see that?" "Here comes the thunder!" "Don't worry, I got this!" He will do crazy stunts and challenges (Ton-Ton is the one that usually starts it) in order to impress them. Which doesn't always go according to plan and he gets a few more dents that Revit has to fix.
Because of his obvious crush, the others tease him relentlessly. Revit included. He's a good sport about it but tries to change the subject. Gets extremely awkward when they decide to tease him when his crush is around, complete with nervous laughter and denial.
Skya: Skya is similar to Ty in the sense that she is the sort to get to know someone before crushing. She is also the kind to play hard to get. (Nope, not interested *secretly interested*)
She will act like she doesn't care but she is always showing off for them, doing skillful but unnecessary tricks. This confuses the others as she seems to get more competitive than usual when the crush is around.
Once the others catch on that she does indeed have a crush, they tease her. Skya is more defensive, denying any accusations of having a crush and threating to introduce them to her hook. So teasing her has a definite line that the others don't want to cross.
Dozer: Dozer is in complete denial and is incredibly defensive. Although he isn't quite as moody when they are around.
He starts off indifferent to them, like they're just another friend. Then maybe they get snarky or do some inpressive dozing/fighting and Dozer finds himself liking them more. Bonus points if they have a soft spot for the Tortools.
The others don't tease him if they don't want him blowing up at them. Teasing is usually done in a hit and run type thing but they can sometimes get away with with it if they do it subtlety. The best course is to tease him when he's out of earshot.
Ton-Ton: The one who has know idea he's crushing until the others point it out. He's too busy having an awesome time with them.
He spends a lot of time hanging out and doing things with them. And of course Ton-Ton shows off his impressive stunts. He can also stumble a little over his words which the others think is hilariously adorable (Dozer just finds it hilarious). He's surprisingly considerate of the other and will do things that they are comfortable with even if they're something he doesn't normally do (like sitting still or going on a leisurely drive).
The others of course tease him but he either just doesn't care or they go over his head. Since it doesn't get much of a reaction, they pretty much gave up teasing him. Though in general, he's a good sport about it when they do.
I may do another one of these for the Reptools later. Feel free to submit your own ideas or if you have anything to add.