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Wow, a melted throw out bearing - that’s a first!

I was assuming it was a torsion spring that you have pre-load, or wind up. Vertical springs are pretty mild, you’ll be fine on those.

Low oil will not cause spark knock. What makes you think you are getting pre-ignition/spark knock?

If you don’t really know what you are doing, please consider using a professional to install new springs. I like to do most all my own work, but I would not even think about touching one of these springs, they can be pretty deadly.

I do all my own wrenching, except mounting/dismounting tires. For $40 a pop, well worth it. I used to change out my motorcycle tires by hand, but I gave that up too.

The front suspension does not appear to be stock.

I think you are correct. I wonder what component failed first - flywheel, disk, pressure plate, or maybe even a bolt sheared of.

If the hydraulic fluid gets overheated, or there is air in the line that gets hot and expands; this could slightly disengage the clutch, causing it to slip and heat up. However, even if this were the case, the clutch/flywheel shouldn’t grenade. If the clutch is slipping, it should eventually...

Voltage and load test both batteries separately. Bad batteries can cause those issues.

Lucky she and the dogs got out of that blaze. Yes, I’m sure there’s lots of evidence in burned median.

Interesting photos. Have you seen the friction disk? Is it worn or glazed?

Ithink you are on the right track here. Looks like the flywheel parts may have blown.

Well, I guess I spoke too soon. Rear window defogger wire broke yesterday. Out of warrant, so I’ll try soldering it.

What exploded, and tore through the bell housing? Flywheel, clutch friction disk, or pressure plate? Was the friction disk worn down to the rivets?

Have you called your service advisor? Did you speak to him/her? No need to go above them unless they are not being responsive.

Glad driver and dogs are OK. Either the clutch and or flywheel grenaded, shattered the bell housing, shredded the hydrolic lines, and puuff. I would love to forensicly diagnose what happened here, including measuring the pressure plate thickness to see if the disk was worn down or something...

I loved my CJ3, but with no doors and a top speed of 55, I can relate.

Those marks are from the rivet on the pressure plate. Friction lining must have melted off.

Bummer, sorry. Auto or manual? What failed? Hope you’re back on the road/trail soon.

whether it will apply significantly more stress on the Sport's non-heavy duty brakes and drivetrain. More stress, yes. Significantly more….no. Not something I’d worry about.