since youre almost @ 200k miles It could just be its time for that gasket to just go a natural way of death...worn out (or not)
miss-shifting like...what?
Grind a gear? That wont do it
Screw up and go for 5->4 and instead go 5->2? That may blow a head gasket...and it will blow other things too (like holes in your block)
if youre worried about a blown gasket, change the oil and look for coolant in it (you can try to do it by just the dipstick...but I never could that way). Depending on if the gasket is dead, the oil will certainly look different than it should (some say its like mayo)
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