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Any idea what actually failed?
I'm wondering if the CV joint is popping out of the cup after having the transmission moved backwards that extra inch. I've recently learned the importance of having proper CV to cup engagement after having my race car (don't get all excited, it's a 1992 Plymouth Sundance...) pop the axle on lap 1 of a 24 hour endurance race.
We swapped to a more modern engine and redesigned all the motor mounts. Unfortunately, the geometry wasn't quite spot-on and we were blowing passenger axles within a lap or two. We eventually made a 1/2" spacer between the outer CV axle and the hub that pushed the axle further back into the trans. Once the spacer was added, the axles stopped failing.
Just throwing this out there because I have my concerns about moving the transmission back without lengthening the CV axles.
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