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'77 401 crank flange question |
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dane 
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Joined: Jul/13/2008 Location: Ponca City, OK Status: Offline Points: 530 |
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 Topic: '77 401 crank flange questionPosted: Feb/12/2018 at 11:19am |
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I'm starting a performance 401 build for my car. It's has the stock '74 727 in it. The 401 came out of a '77 J10 or 20 with a TH400. My question is will the 401 crank flange work for my '74 727 flexplate? I have read that it will if you remove something but I dont recall what,.. any comments?
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1974 Matador Coupe Brougham aka "The Mat"
1975 Matador Coupe Oleg Cassini Edition 1969 Javelin SST (Project Car) - SOLD but not forgotten |
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AMC RICK 401
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Posted: Feb/12/2018 at 11:33am |
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your need to remove the converter bushing in the end of the crank.
it would remind you of a cam bearing. th400 converter has a smaller diameter nose than a torqueflite that's why it has the bushing |
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1969 SC Rambler
1974 Jeep CJ5 Dirt/Sand Drag Racer w/401 TH400 Tube Chassis Dirt/Sand Drag Racer w/401 Powerglide "We are not here for a long time but we are here for a good time" |
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dane
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Joined: Jul/13/2008 Location: Ponca City, OK Status: Offline Points: 530 |
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Posted: Feb/12/2018 at 11:45am |
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that's what it was!! Thanks buddy!!
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1974 Matador Coupe Brougham aka "The Mat"
1975 Matador Coupe Oleg Cassini Edition 1969 Javelin SST (Project Car) - SOLD but not forgotten |
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SC397
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Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
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Posted: Feb/12/2018 at 11:47am |
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Yep, what he said. It is called a Sizing Ring.
http://www.ifsja.org/forums/vb/showthread.php?p=1684230#post1684230 |
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Feb/12/2018 at 7:52pm |
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As long as the 727 flex plate is for a 401.
Remember, all gen2 and 3 AMC V8s are externally balanced. |
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Gremlin Dreams
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steinercj5
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Joined: Jul/29/2016 Location: Kenosha Wi Status: Offline Points: 144 |
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Posted: Feb/16/2018 at 7:54am |
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I'm also putting together a 401 that was formerly mated to a th400. It will be now mated to a TF so my question is where do I find a 401/tf flex plate and is it easy to tell the difference between the two.(I have the orignal th400 flexplate) Thanks - Greg
Edited by steinercj5 - Feb/16/2018 at 7:57am |
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dane
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Joined: Jul/13/2008 Location: Ponca City, OK Status: Offline Points: 530 |
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Posted: Feb/16/2018 at 10:31am |
JEGS & Summit Racing have them & most local parts stores for stock applications. I'm looking at this one for my build PRW 1840100 Gold Series SFI-Rated Chromoly Steel Flexplate 1971-77 AMC/Jeep 401
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1974 Matador Coupe Brougham aka "The Mat"
1975 Matador Coupe Oleg Cassini Edition 1969 Javelin SST (Project Car) - SOLD but not forgotten |
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steinercj5
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Joined: Jul/29/2016 Location: Kenosha Wi Status: Offline Points: 144 |
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Posted: Feb/16/2018 at 11:53am |
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Thanks Dane.
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tufcj
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Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4086 |
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Posted: Feb/16/2018 at 2:20pm |
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The factory TF flexplate is almost solid. The TH400 flexplate has slots in it so it looks like it has 3 arms. I have a couple of 401 flexplates for the TH400.
Bob tufcj |
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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steinercj5
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Posted: Feb/16/2018 at 2:26pm |
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Got it- thanks Bob.
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steinercj5 wrote: