Slipping after shifts

[JDC1337]

Hi I'm driving a 99Z28 and here's the story.
So I just recently had a new clutch put in, it's just a spec stage1 as I wanted it to be comfortable in traffic and such. I also replaced the flywheel and slave cylinder along with the clutch as well as a hurst short shift. Anyway, when I shift from 1-2 2-3 3-4 @ full throttle I'm experiencing some kind of lag in the pull of my vehicle. The RPMs go up but the car feels like it has to catch up. Once the revs are @ 4000-4500 or so the car lunges forward and continues to pull. I just got this clutch so I don't think that it's causing the problem. My friend did say that whilst installing the clutch for me, he noticed that my diff isn't in very good condition. Could it be my diff that's causing this problem? I'd like to fix it soon as it's severley affecting my performance. Thanks for your help.
-Jonathan

[Dillard99]

can be or check your tires, I have a stage 3 spec clutch in my 01 Z28
Camaro and experienced the samething I thought it was my clutch but it was'nt it was my tires sometimes tires will slip I've experienced it in 2nd but mostly 3rd gear and was worst when nailing it.