I called Jasper the other day to see if I could find out what happened to my transmission. The rep I spoke with said they do disassemble all warranty replacements to determine what went wrong. He said the failure on mine was caused by a defective forward sprag that came apart. He said this type of failure is very uncommon, but they do happen, and so the reason for the warranty.
I don't know if this is a part they replace during the rebuild or not, I really don't know as much as I should about the details of how transmissions work.
Anyway, I feel better about my replacement knowing the failure was an odd occurrence.
