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401 Crank |
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STGKlopp 
AMC Apprentice 
Joined: Jun/15/2011 Location: Everett, WA Status: Offline Points: 87 |
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 Topic: 401 CrankPosted: Apr/08/2012 at 12:19pm |
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What needs to machined to a 401 crank to switch from an automatic trans to a Manual?
Jereme |
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SKeown
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Joined: Jul/30/2009 Location: Texas Status: Offline Points: 2027 |
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Posted: Apr/08/2012 at 12:26pm |
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Nothing, just get a 401 flywheel, unless it's a flat flanged 71 crank, then use a 390 flywheel. Unless there is already a pilot bushing in the crank, you'll need that too.
SKeown
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401MATCOUPE
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Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 614 |
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Posted: Apr/08/2012 at 12:31pm |
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Nothing if you have the 401 auto flex plate or flywheel that was originally attached to it, other wise you need to find a 401 auto flex plate or flywheel and have the rotative assy rebalanced. Really need to know what the crank came out of (flat flange or step flange) and if auto, what type was in back of the 401....and what flywheel/flex plate you are going to. From the factory a 401 crank will technically fit behind any trans.....but depends on what combination you are putting together, you may have a balancing issue. Just my opinion, I rebalance every engine I don't know the origin of all the parts, too much room for error and spending money for nothing.
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Ross K. Peterson
68 X,GoPac,343,AT,ScarabGold(1stCar) 68 X,GoPac,390,4sp,ScarabGold 69 X,GoPac,390,4sp,BealeStBlue 70 X,GoPac,390,4sp,Glen Green,8 70 X,GoPac,390,4sp,BBO,8 74 MatadorX,401,AT,Prototype |
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STGKlopp
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Joined: Jun/15/2011 Location: Everett, WA Status: Offline Points: 87 |
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Posted: Apr/09/2012 at 3:28pm |
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I wish I could look at it and tell ya. I'm in the Persian gulf at the moment so that's just not possible. I running a manual for sure and I'm hoping to stick with the M21 I have on hand as well as the BW twin disc clutch. (SB 350 in the car right now)I know I can get the bell-housing from Quicktime. I know the 401 I bought came out of a 1976 jeep but that's all I know. Will I be able to run what I have?
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STGKlopp
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Joined: Jun/15/2011 Location: Everett, WA Status: Offline Points: 87 |
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Posted: Apr/14/2012 at 3:39pm |
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So by the lack of replies either no one has tried it or no one knows. I guess I'll find out when I get home and I can look at everything. If it cant be done with the T10 handle a 401 putting out around 450HP at the crank?
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SKeown
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Posted: Apr/14/2012 at 3:52pm |
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I run a T-10 with the weak 2.64 W ratio gearing, my engine produces over a 100 HP more than that. The trick to getting it to live is the use of an adjustable iron disc slider clutch and small 27" tires. I've run a best of 10.47 at over 129 MPH with a 3300# AMX.
SKeown
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STGKlopp
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Joined: Jun/15/2011 Location: Everett, WA Status: Offline Points: 87 |
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Posted: Apr/14/2012 at 4:01pm |
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So just going to the T10 would probably be easier then?
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6PakBee
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Posted: Apr/14/2012 at 4:53pm |
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I think what may be confusing you is the early 401 crank that SKeown mentioned. With the second generation AMC V8's there are two types of V8 cranks. '71 and earlier cranks have flat flanges that have the register on the OD of the flange. '72 and later have the register on a centering ring at the center of the crank. As long as you keep the correct crank family with the correct flywheel/flexplate family there shouldn't be a problem with fitup. Balance is another consideration. There is a procedure to machine the earlier crank to install the centering ring but finding the correct crank or changing to the '72 and later would probably be the better choice.
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Still buying parts for the Machines. It's a disease.
Roger |
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STGKlopp
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Joined: Jun/15/2011 Location: Everett, WA Status: Offline Points: 87 |
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Posted: Apr/14/2012 at 7:48pm |
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So being that I have a 76 crank it shouldn't be a problem then? I'm
somewhat new to the AMC world and I'm seeing they used a lot of this and
that as far as components from the big 3. It looks like several GM vehicles used the Muncie and the T10 trans. What are the input shaft differences? I don't see any AMC guys using the Muncie Trans. Is there a reason for that?
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6PakBee
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Posted: Apr/15/2012 at 9:45am |
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With a '76 crank you can use either the T-10 or the Torqueflite successfully with the right choice of parts. As to the AMC T-10, the following thread discusses this very thoroughly.
http://theamcforum.com/forum/t10-close-ratio-vs-wide-ratio_topic16500.html Edited by 6PakBee - Apr/15/2012 at 9:46am |
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Still buying parts for the Machines. It's a disease.
Roger |
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