Re: 401 in a mid 70s crew cab
The 478 always had the 8 bolt flywheel, it's possible things may have not been holding up with a 6 bolt in later years because 401's were in larger 7500-8500 series trucks. In your case a 1 ton Crew Cab will be fine with the 6 bolt setup. If you can make your own adapter that will be cost saving.
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