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easydean View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote easydean Quote  Post ReplyReply Direct Link To This Post Topic: 727
    Posted: Jul/21/2017 at 4:10pm
Can I use a 727 on a 343?  Do I use the 343 flexplate?  Do I need to redrill convertor holes?  Thanks, Dean
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bigbadgreen View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bigbadgreen Quote  Post ReplyReply Direct Link To This Post Posted: Jul/21/2017 at 4:33pm
Dean somebody used to make an adapter for the early flat flange style crank to the newer stepped style. Otherwise the crank would need machining or a newer style crank would need to be used.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote typhooner Quote  Post ReplyReply Direct Link To This Post Posted: Jul/21/2017 at 4:49pm
Hi Dean. Bulltear makes the adapter for flat flange cranks to modern stepped crank tranny. $94.00
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401harry Quote  Post ReplyReply Direct Link To This Post Posted: Jul/21/2017 at 6:41pm
A recent thread addressed the same scenario but with a TH 400..IMO the only bolt in solution for a 727 on a early BW motor is a custom converter to mate the 2 as the 343 flexplate wont take a standard 727 TC due to the pilot hole in the crank. If you want to pull the crank and have it machined thats the other solution
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Jul/21/2017 at 7:51pm
This is the bolt on adaptor kit, not sure if they are still available, but would use the later flex plate as well:



Custom convertor option, there are probably better ways to do this, this is just the way the one I inherited was done:







Or you can machine the crank as per these instructions:



Or finally, you can rebuild the engine using a later 360 crank and some carefully chosen pistons.

The Bulltear adaptor ring is to put a TH400 behind a later TF engine I believe.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WesternRed Quote  Post ReplyReply Direct Link To This Post Posted: Jul/22/2017 at 7:04pm
A pictures showing the difference between the early and late crank to complete the story:

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