Clutch Slip @ Drags

[R.3.2.G.T.R]

soo had an awesome day out at sau drags at wsid, however had issues with clutch

Running nismo twin plate coppermix that's about 10k old, clutch had been run-in properly as per instructions

on the track, I was revving up to 6k or so prior to slipping it, although admittedly being a 1st timer, few launches were with clutch riding a bit longer than normal

after 8 or so goes, times were getting worse, in 2nd/3rd gear full tilt, I can see the revs skip from 5k to 7k at which point I shift gear again

Initially, when I was running down the track and hitting almost 7k, my revs were dropping back to 6k or so, before revving normally thru to 7k without any gear change

Now I'm thinking either I killed the clutch discs or rear main seal has perhaps contaminated the clutch, currently the car struggles to pick any speed at all thru the gears so I limped it home

Going to award diffs (who installed my clutch) and getting their opinion on the matter before getting them to remove the gearbox

I'm thinking in replacing the rear main seal nonetheless, what else should I replace at the same time?

Bloke in eBay is selling replacement clutch discs (x2) for my clutch so that might be the go

Anything else I'm overlooking?

[luvpsi]

could be oil cantamination. i have a little oil prob with mine but it does not slip anywhere near that much only everyknown and then i can smell clutch but it still grabs strong and does not slip all the way through to redline

[R.3.2.G.T.R]

hmm I can understand the rev jump up due to clutch slip but was causes the revs to drop under full throttle without gear change?

my clutch fluid which is normally clear appears more murky now, not sure if that's an indication of anything

Also there's a lil leaks near the front propshaft knuckle

What's the seal called?

[luvpsi]

makes it hard due to i have never seen the underneath of a gtr before so i dont know the set up

[turboedsloth]

If that is the sump end its a pinion seal for the front diff. As for the clutch possibly having oil contamination, you won't be able to tell fully until the box is out. It might just be that the unit burnt out, who knows.