There have to be hundreds, if not thousands, of street rods/hot rods and Cobra replicas running the Jag rearend.... let alone in original Jags since "62 or so.
Sure some have failed...due to maintence, negligence or fatigue .... or ignorance/stupidity on the owners part.
It must be he!! to be an engineer
(no offense meant if you are one)
If I worried about every little niggly thing about any car I drive I would never drive it, be it the replica or the daily driver.