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Old February 21st, 2010, 10:14 AM   #1
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Default 401 crank

Anybody have a good 401 crank laying around they would like to get rid of?
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Old February 21st, 2010, 06:09 PM   #2
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Which version do you need?
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Old February 24th, 2010, 07:56 PM   #3
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Not sure.........Didn't know that there are different ones. I spun a rod bearing and chewed up the mains on my 401 , not sure if i should pick up another crank or get this one fixed. It's already .010 under.
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Old February 24th, 2010, 08:26 PM   #4
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Originally Posted by DuramaxPowered View Post
Not sure.........Didn't know that there are different ones. I spun a rod bearing and chewed up the mains on my 401 , not sure if i should pick up another crank or get this one fixed. It's already .010 under.
It is forged. 0.010 under isn't much on that. Being it is not cast, it is also weldable.

Getting back to the differences, the 71 crank is different than the 72-up. What is the motor in/from and what is your driveline configuration?
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Old February 25th, 2010, 06:33 PM   #5
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77 cj5,360 with a rod through the oilpan right now, t150, and d20.......I bought the Jeep last June and it had the 401 in it when I purchased it. It was a "fresh" rebuild, but didn't last very long. Chewed up cam/distributor gears and spun a rod bearing within a month of owning it and only driven a total of 2-3 hours. I swapped in a "junkyard" 360 so I could make it to Silverlake for a trip we had planned. Well, I was playing in the snow a couple weeks ago and blew a rod through the oil pan on the 360, so I figured it's time to rebuild the 401 and put it back in or swap a 350 in.......
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Old February 25th, 2010, 07:44 PM   #6
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No idea why a flawed build (attention obviously not given to the oiling system and probably had mismatched cam/distributor gears, too) and junkyard motor of unknown history would cause you to swap in a SBC that would cost you more in adapters and driveline pieces, but...


I don't see any reason to not get the current crank turned and buy a new crank kit.

I like Booth Aron's, which is where I got my last forged AMC crank turned. They are old-school AMC.

http://www.bootharons.net/
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