i have a 89 warrior, excellent shape, when i drive it though there is a problem and i cant quite get my finger on it. when i mash the gas in 4th,5th, and 6th gears it doesnt act like it is putting the power to the ground and it kinda vibrates. is this my clutch slipping? could the plates be sticking together a little bit. when its in 1,2,3 and you punch it, there is no problem and it doesnt vibrate at all. has anyone else ever had this problem? could it also be my tires, 22 spider trax, it also did it with my 22 shredders on it, but never did it with stock on there. what could be the problem here?

 

Your clutch is slipping. I will be worse in the higher gears. Replace the clutch.