On the last misson where you have to attack those cars that t-x makes go after you. The part I can't beat is when you have to catch t-x.I can't catch her.she's too fast. any help on this. please help
I don't know if you've already beaten it since this post, but the idea is quite simple.
Shoot the TX with the shotgun until she stumbles, then aim at the tyres of the crane and blow them out. There are, if I remember correctly, 4 sets of tyres to blow out.
For every time you take her down, you will be able to blow one set of tyres. It is way easier to blow them out from a side angle on the crane. Once a set is blown out, the balancing legs on the crane will stick out in an effort to stop you blowing more tyres out.
Then repeat the process for each set.
**In short: Shoot the TX til she stumbles - blow out tyres - repeat.**
It can get a bit tricky at first with aiming, riding and shooting at the TX controlled cars all at the same time, but its worth it to somewhat participate in the great T2 chase scene which this is obviously a tribute to.
(Remember that you can also cammandeer other vehicles if the cycle is too damaged.)