flywheel and dampner ??
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New User
Joined: Aug 2006
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flywheel and dampner ??
Doing a 351m to 400 build in a 1979 f250 4x4 and would like to know if I need to change out the flywheel and dampner to make this right. Ive read many times the only difference between the 400 and 351m were the crankshaft and pistons. Ive done some research on the older posts and I still dont have a clear answer. Any accurate information would be lovely.
ps: this site has been most helpful already, keep up the great posts....
ps: this site has been most helpful already, keep up the great posts....
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Joined: Jul 2006
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Originally Posted by fjord250
Doing a 351m to 400 build in a 1979 f250 4x4 and would like to know if I need to change out the flywheel and dampner to make this right. Ive read many times the only difference between the 400 and 351m were the crankshaft and pistons. Ive done some research on the older posts and I still dont have a clear answer. Any accurate information would be lovely.
ps: this site has been most helpful already, keep up the great posts....
ps: this site has been most helpful already, keep up the great posts....
Posting Legend
Joined: Sep 2001
Posts: 30,255
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The balancer part number was changed over the years and differed for the 351M and 400. I do not know what the changes were.
Part numbers are here:
http://home.earthlink.net/~bubbaf250/parts/parts04.html
Part numbers are here:
http://home.earthlink.net/~bubbaf250/parts/parts04.html
Posting Guru
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From: western montana
dampners can come apart and flywheel (flexplate?) is an important swap too. The flexplate carries the ring gear and for 55 bucks it would be nice to know yu have a good one thats the right part.
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Thank yall for all the info about the flywheel and the dampner. My 400 modified is coming along quite nicely. Kidding about the 400m but I did not know about the flexplate term. Why is it called a flexplate verses a flywheel?
Posting Legend
Joined: Sep 2001
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Flexplate, a sheet of stamped steel with ring gear, is used with an automatic.
Flywheel, a cast iron or or heavy steel plate with ring gear, is used with a clutch.
Engine is 400, -no M.
Flywheel, a cast iron or or heavy steel plate with ring gear, is used with a clutch.
Engine is 400, -no M.
Last edited by Torque1st; Oct 6, 2006 at 10:27 PM.
