I think I killed my clutch! Help!

i will take a stab. i like your thinking. thinking of slipping alone, you probably toasted the disc, plate or flywheel.
i am not familiar with your 4th gear method of testing. you suspect a slipping clutch. now a test like that is likely to stall the motor, but if the clutch is slipping, this would only help validate your test (if it slips it would be less likely to slip).i see the point of seeing if the RPM's skyrocket when gunned, though. im just not familiar with that test. i would try something like putting it in 5th with the brake on. engage the clutch and see if it stalls nice and fast, as it should.

in any case, it does sound like it is slipping based on the redline experiences. slippage seems to get worse at higher RPM's anyhow.
now for the part about losing the pedal on your second test. my guess would be that the pressure plate broke or the cable is going (cable does not explain slipping that i can think of). PP would explain the lack of clamping force (slippage) and why the pedal dropped off.
your cable is still an option, but as i said, i dont see how it would allow slippage. . i have broken a couple of cables (one motorcycle and a car). the car did the same pop you had, and two shifts later, it went altogether. the bike lasted a day or two. (in case you want to play with it and see if it will go altogether - while in the driveway).

i know this is hard to understand. sadly, that is how my brain works. LOL. that is my two cents worth. good luck.

look under by the tranny to make sure your cable isnt screwed up. My cable went out three weeks ago, was still in one piece but the part that helps hold the tension ripped. kinda hard to explain.

The quadrant adjusted when you the pedal slipped from under your foot, probably a good thing but maybe not, reach down and pull up on the pedal with your hand and see if it clicks, does sound like the clutch is slipping though

What kinda clutch cable, quadrant and adjuster do u have. It might be that you just messed up the cable and thats why the pedal dropped a bit. As for the slipping clutch, i have never heard of a 4th gear dead stop test. I would think it would just stall the crap outa the engine wouldnt it? I would check the entire length of the cable and look for any frayed sections. It is a braided cable so its possible it came unwound a little. If you still have that piece of crap plastic stock quadrant, i would give that a check too. good luck man

Sounds to me you might be in for a new clutch soon. Look at the heavy duty ones if you like to powershift like I do. I toasted my clutch powershifting at 6800 rpms.

i get the clutch test now. originally, for some reason i was thinking you were slipping the clutch from a stop in 4th. i get it now. hard on the motor, but a decent test. you would sure find slipping fast (too hard to tell in 1st or 2nd sometimes).

im interested to see what the shop says. good luck.

that is weird - what your mechanic said. when mine goes, i am goin to use a Spec stage 1, even though i drive like a lil old lady. he must think you drive like an animal, and having a weaker clutch will allow it to be the weak link when you romp on it and something goes.
i would be sensible and go with a nice clutch package, like the FRPP pieces you want to use. my two cents worth. good luck.

i would of personally went with the spec stage 1... but the king cobra clutch is good nonetheless. Are you installing the clutch yourself or having someone else do it?
Im installing mine myself, easy when my car is gutted =) Engine is on a hoise, tranny on a stand. YAY