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401 in a 1987 Grand Wagoneer |
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Babycakes 
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Joined: Feb/24/2010 Location: Henderson, Nv Status: Offline Points: 145 |
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 Topic: 401 in a 1987 Grand WagoneerPosted: Nov/13/2017 at 3:18pm |
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I have the 401 727 flexplate. Can I expect any pitfalls or is this a direct swap? I read a post awhile back where starter engagement was an issue. Any thoughts? Kind regards, Steve
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idrambler
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Joined: Jul/02/2007 Location: Nampa,Idaho Status: Offline Points: 2942 |
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Posted: Nov/13/2017 at 6:30pm |
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What engine is in your 87 Jeep now....
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Jim....AMCRC
Treasure Valley AMC Club, Pres 69 AMX 401/727 74 GremlinX 401/727race only 73 Matador 2dr HT 360/727 |
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DaemonForce
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Joined: Jul/05/2012 Location: Olympia, WA Status: Offline Points: 1070 |
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Posted: Nov/13/2017 at 6:42pm |
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401 flexplate belongs on the 401, so use it.
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1971 Javelin SST
American 304 2v | FMX | AM20-3.31 1983 American Limited Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72 |
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purple72Gremlin
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Posted: Nov/13/2017 at 9:09pm |
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And just use the motorcraft starter instead of the denso starter.
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1970390amx
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Joined: Jul/11/2008 Location: colorado Status: Offline Points: 3314 |
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Posted: Nov/13/2017 at 10:05pm |
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What did the 401 come out of? If it had a turbo 400 behind it the crank might have a thin spacer ring in it that needs to be removed to use a 727 converter behind it.
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1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box |
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Babycakes
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Posted: Nov/14/2017 at 4:49am |
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Stock 360 is in the vehicle for now. The 401 had a flywheel. Thank you for the responses.
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bbgjc
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Joined: Nov/24/2009 Location: No.VA Status: Offline Points: 1660 |
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Posted: Nov/14/2017 at 5:09am |
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Let me get this straight. The 401 originally had a manual transmission behind it, correct. The current 360 has a 727 automatic transmission. You want to remove the 360 and bolt in the 401.
You'll have a very real situation of the harmonics of the engine being off. The AMC engines are externally balance, the rotating assembly( harmonic balancer, crank, rod/piston combination, and the flywheel or flex plate) are balanced together as unit. So, the 360 flex plate is balanced for the 360 rotating assembly. The 360 and 401 flex plates weigh much less than a flywheel. I would not just bolt on a flex plate instead of the flywheel and hope for the best. It could end up an expensive problem down the road. You would need to source, at the minimum a 401 /727 flexplate. IIRC, the last 401's were available in 78. You'd have to track down a 72 thru 78 727 401 flex plate. If you aren't in a rush, I would collect some funds together and go through the engine. Get the rotating assembly balanced, new bearings and bearing. New gaskets and go.
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Buzzman72
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Posted: Nov/14/2017 at 5:57am |
So he says he HAS a 401 flexplate...in the very first post on the thread. So NOW where's the problem? |
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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bbgjc
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Posted: Nov/14/2017 at 7:00am |
Directly above my post is this quote from the original posting party. I'm only trying to clarify the info and assist. SO, I don't have any problem.
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Buzzman72
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Posted: Nov/14/2017 at 10:11am |
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So he's wanting to install a 401.
And he has a 401 flexplate for a 727. So where's the balance problem? |
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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Babycakes wrote: