[Capsfan]

Sounds like you got really unlucky, and had a defective CV joint (which won't be made by McLaren).

As long as it is fixed properly and it doesn't happen again I'm not concerned .

 

[broomhilda]

Blown up CV joint. Going through the gears and then boom between 3rd and 4th. Tech says they've never heard of this before.

I was in an endurance race at Riverside Raceway California in 1981 driving a Porsche . First leg driver came in
complaining of vibration . I took over next stint . Vibration went mostly away after maybe 3 laps . Then CV joint broke going to blind Turn 2 at about 130 mph . Car spun then went off the track backwards hit a burm launching it high into the air and rolled various times . I was unconscious during the flight time . Good thing we had a good roll cage and my crew chief always synch up my safety harness super tight
Corner safety crew and doctor thought I must be dead but was just knocked out
So a bad CV joint is not a good thing
Any severe chassis vibration needs to be immediately looked into
Minor track day chassis vibrations can sometimes be eliminated by always taping over the wheel weights
OEM P Zero tires with foam padding inside can also cause vibration when the foam comes adrift
The Pirelli Corsas McLaren Dealers recommended would chunk on a warm track day causing vibration
P Zeros are crap on a McLaren in spirited driving /cornering
Torfeo R’s are great but too expensive and hard to source

 

[ImBunky]

CV break all the time on modified 720s.

Always another weak link when modifying. Appears OP wasn't modified though.

 

[mrvex]

I was in an endurance race at Riverside Raceway California in 1981 driving a Porsche . First leg driver came in
complaining of vibration . I took over next stint . Vibration went mostly away after maybe 3 laps . Then CV joint broke going to blind Turn 2 at about 130 mph . Car spun then went off the track backwards hit a burm launching it high into the air and rolled various times . I was unconscious during the flight time . Good thing we had a good roll cage and my crew chief always synch up my safety harness super tight
Corner safety crew and doctor thought I must be dead but was just knocked out
So a bad CV joint is not a good thing
Any severe chassis vibration needs to be immediately looked into
Minor track day chassis vibrations can sometimes be eliminated by always taping over the wheel weights
OEM P Zero tires with foam padding inside can also cause vibration when the foam comes adrift
The Pirelli Corsas McLaren Dealers recommended would chunk on a warm track day causing vibration
P Zeros are crap on a McLaren in spirited driving /cornering
Torfeo R’s are great but too expensive and hard to source

What car?