It's most likely that 1350 yoke doing that. Ive noticed some of those being as beefy as they are do stick out a bit further as well.
As far as a 12 bolt being a direct swap, yes. Dad's goat still had it's born with driveshaft when we removed it's original rear and swapped the 12 bolt in, the driveshaft was a slam dunk.
When I later upgraded the 12 bolt to a 1350 yoke I also had a beefy driveshaft made at the same time with 1350 ends and a billet trans yoke.
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