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We're covering this subject pretty thoroughly, but folks are curious.

The CJ3A, Jeepsters, trucks and wagons (46 - 501/2 or 51) used a push-in starter that creates a lot less shock to the ring...

Remember, with Jeeps, anything can and has probably happened. But, having said that - the ".. running a 6-volt starter on 12-volts wears out the ring gear/flywheel..." story is probably somewhere...