Sticky clutch???

[patch697]

G'day guys I just Have a question about the clutch. When the revs are up over 2500/3000 rpm the clutch seems to get really heavy and seems like it's sticking especially between 2nd to 3rd and 3rd to 4th. But if I change gear anywhere below that rev range it's light and responsive.
Is it buggered??

I take it your talking Petrol engine here & if so then this is a common issue with power assist clutchs. There is nothing going horribly wrong here just a drop in manifold vacuum so your clutch booster is not fully recharging hence your clutch peddle fells heavier.

You can fit an after market vacuum retainer tank which helps keep move vacuum stored in reserve but there not all that cheap new.