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AMC Harmonic Vibration Damper Listing |
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Pre 72 cranks don't match to a TC tranny, only BW. So either one of three options can be done. A custom kit for tranny swaps, or a swap of a 401 crank into the 70 390 block (which could be done cheaply, and very easily from the late 70s to early 90s), or by machining (70 crank to fit the TC converter, or converter snout to fit 70 crank). I assume the flex plate should be a match from a 401 with TC automatic. The question is can a 70 3 bolt balancer properly balance as well as a 72 on up balancer for the mix match??? To me it's negligible, as it is street driven mostly and not cracking over 4700+ RPM constantly. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Raymon......the first thing to know is did the previous owner ever have the 70 360 and torqueflight combination running?? If so that could solve a host of problems issues up front.... You say you have the 70 390 in it already, so you must have already taken step to adapt the Torqueflight to the early flat flange crank. Forget about the style of balancer, 70 360/390 used the same casting number....they did have a different balance. BUT since 70 390 never had a Torqueflight and it sounds like some other unknowns, it should have been re-balanced with a Torqueflight flex plate (a 401 flexplate would be best choice)........honestly you have a bit of dice rolling going on. A re-balance is the only way to ensure a vibration free installation with this combination. If you have it all installed with the 70 390, try it.........
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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DHACKING
AMC Apprentice Joined: Oct/06/2014 Location: DALLAS FT WORTH Status: Offline Points: 184 |
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yes I bought it this way 390 in it...I checked the casting # on the balancer to see if it was 360 or 390 balancer and found out they have the same casting.
I have no way of knowing where the torqeflight came from. thanx for the replies the rest is left unknown. raymon |
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RAYMON H
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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You can check the flex plate for identification, without removal. There is a flex plate thread with pix. You can ID a 401 version by counter weight location and size. You need to either post a good picture or look through the thread that i will add, for you to verify on your own. With the inspection cover off, You will need to manually crank the engine to the drain plug hole on the flex plate. Take note to see the counter weight edge just under the converter, it may be further up and barely visible. Here is a picture... If your flex plate is from a 401 it will be 180° from the drain plug hole. So crank about 1/4 turn more to verify that the counter weight is barely shown through the access cover opening. Rotate further to get a good measurement of how far the weight is from the drain plug hole. Then once you have that measurment, measure the width of the counter weight. Here is the flex plate thread. http://www.theamcforum.com/forum/flex-plate-id_topic4832.html Edited by 304-dude - May/06/2018 at 9:59am |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Raymon.....do you have it running??? That is the key, hopefully the last owner was smart enough the have it balanced. If it was rebalanced, it does not matter what flex plate is in there, the Machine Shop would have add/subtracted weight as required and then should be fine.
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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dltowers
Supporter of TheAMCForum Joined: Dec/12/2012 Location: Friendswood, TX Status: Offline Points: 5827 |
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Not sure if this will help, but here are a couple of photos of the original factory Harmonic Counter Balancer that was on my wife's 1974 Javelin, build date is June 1974.
Drive train: 360, 2 barrel, 727 TC. Looks like the part number is: 3216084.... |
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Original Owner, 1974 Javelin:
360ci,2v,727TC. Motorola Multiplex with 8-Track. G4 Plum exterior with 421Q Black Uganda Interior. Purchased on July 16, 1974 from Hooker AMC, Sherman, TX for $4500.20 |
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amx007
Supporter of TheAMCForum Joined: Dec/31/2008 Location: stone pk Status: Offline Points: 750 |
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can I get my 290 one rebuilt the rubber is bad machine shop need it for engine balancing
gary |
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dream red white and blue
1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
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Bruce Clarkson
AMC Addicted Joined: Feb/09/2013 Location: New Bern, NC Status: Offline Points: 538 |
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Various folks such as Damper Doctor can fix the Damper. Then your rebuilder can balance with it.
Bruce Clarkson
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Bruce Clarkson
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javideofree
AMC Fan Joined: May/06/2019 Location: USA Status: Offline Points: 1 |
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So 70 390 balancer won't work for 70 360? I thought they were same
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oldamcer
Supporter of TheAMCForum Joined: Aug/09/2007 Location: Ohio Status: Offline Points: 283 |
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OK guys here is one for ya! #3230132 I can't find this one. Thanks
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40 HudsonCoupe 304/904
33 Essex 315/904 47 Hudson 360/727/TorqueStorm 69 AmboWagon"The Flower Car" 50 StudeGasser360/T-400 74 HornetHatch 304/727 55 Hudson360/904 � |
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