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M11 Transmisssion
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easydean View Drop Down
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    Posted: Jan/20/2016 at 8:35pm
I have an M11 tranny from a 1968 AMX 390 floor shift car. I had the tranny overhauled. A guy wants to buy it for his 290 column shift Javelin. I have the converter as well. Is this a bolt in???? Thanks.
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Points: 5121 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Jan/20/2016 at 9:10pm
The M11B should have been the original trans for the 343. The 390 auto was the M12.

While the 290 will bolt to the M11B or M12, you'll run into two flexplate issues.

1) The original auto for the 290 would be the M44 automatic. It uses a six bolt converter whereas the M11B and M12 converters have four studs.

2) The 390 is externally balanced and I believe the 290 is neutral balanced. Many years ago I ran a 290 I got from a salvage yard with the M12 flexplate and transmission. Had a nasty periodic vibration above 45 MPH.

-Steve-
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easydean View Drop Down
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Points: 1590 		Post Options Post Options   Thanks (0) Thanks(0)   Quote easydean Quote  Post ReplyReply Direct Link To This Post Posted: Jan/21/2016 at 9:17am
I thought all AMC engines where externally balanced.  Can I use the 390 flex plate on the 290?
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Points: 5121 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Jan/21/2016 at 5:58pm
I wouldn't, that's what I did and there was a vibration above 45 MPH.

If you have the original 290 flexplate you could have the 390 flexplate balanced to match it. Then it should work.

-Steve-
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Points: 1578 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amc67rogue Quote  Post ReplyReply Direct Link To This Post Posted: Jan/22/2016 at 7:32am
The 290s 4bbls. in the AMX used the M 11.
Keith Coggins 67Rogue X code
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The 290 4bbls. in the AMX used the M 11. You could drill the M44 flex plate to bolt the M11 convertor.
Keith Coggins 67Rogue X code
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