Just making sure its the clutch.

Whats up guys i still haven't done a clutch because i'm going to do a trans job at the same time. I'm going with a stage 2 center force with a T600 trans. That is the new tremec with the 2.83 1st gear ratio.

Anyway i took my car to the track with the bad clutch and i'm happy with what it ran. The car moves ok as long as i don't gas it hard out the hole. It seems to move fine from 1000-3900RPM but as soon as it hits 4000RPM its a turtle. All the car does is rev and make noise. I'm 90% sure its the clutch but with this hobbie you never know.

What do you guys think? Whats up too i haven't been on for some time. I have just been very busy.