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AMC Harmonic Vibration Damper Listing

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304-dude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 5:11am
Originally posted by DHACKING DHACKING wrote:

I HAVE A 1970 AMX THAT WAS AN ORIGINAL 360...NOW HAS 1970 390 IN IT.
THE CASTING # ON THE HARM BALANCER IS '70 390: #3196925.
THE PREV OWNER ALSO PUT IN A 727 TRANS.
SHOULD I BE CONCERNED ABOUT CHANGING THE BALANCER??
THANX...
CONFUSED


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.




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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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 5:58am
Originally posted by DHACKING DHACKING wrote:

I HAVE A 1970 AMX THAT WAS AN ORIGINAL 360...NOW HAS 1970 390 IN IT.
THE CASTING # ON THE HARM BALANCER IS '70 390: #3196925.
THE PREV OWNER ALSO PUT IN A 727 TRANS.
SHOULD I BE CONCERNED ABOUT CHANGING THE BALANCER??
THANX...
CONFUSED

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.........
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote DHACKING Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 9:38am
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
RAYMON H
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304-dude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 9:51am
Originally posted by DHACKING DHACKING wrote:

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


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
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 10:27am
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.
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote dltowers Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 9:05pm
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....




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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Post Options Post Options   Thanks (0) Thanks(0)   Quote amx007 Quote  Post ReplyReply Direct Link To This Post Posted: Feb/22/2019 at 2:18pm
can I get my 290 one rebuilt the rubber is bad machine shop need it for engine balancing
gary
dream red white and blue
1968 Chicago auto show amx 290 4 speed
1969 driver Amx 290 auto
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce Clarkson Quote  Post ReplyReply Direct Link To This Post Posted: Feb/27/2019 at 8:49pm
Various folks such as Damper Doctor can fix the Damper. Then your rebuilder can balance with it.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote javideofree Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2019 at 2:08am
So 70 390 balancer won't work for 70 360? I thought they were same
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldamcer Quote  Post ReplyReply Direct Link To This Post Posted: May/20/2019 at 8:48pm
OK guys here is one for ya! #3230132 I can't find this one. Thanks
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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