59AB vs 8BA flywheel

[Jay in Mass]

How do you identify a 59AB flywheel against an 8BA?

[scooder]

An 8BA has clutch bolts clear through the flywheel, the 59a And earlier has blind holes.
Martin.

[Binx]

Also, the flat type flywheel used from 1941-48 is roughly 7/8" thick compared to the 8BA type flywheel at about 5/8" thick.

Lonnie

[Jay in Mass]

Thanks Martin and Lonnie
What I'm especially looking for is if there is a actual difference in the ring gear that is used on these two flywheels and what is it? I know that they will bolt onto both engines, but the wrong one will hang up the starter drive.

[JSeery]

The ring gears are different diameters, but it is the inside diameter that is different. The difference you are referring to is in the flywheel itself.

[cas3]

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heres more : https://www.fordbarn.com/forum/showthread.php?t=187692

[Jay in Mass]

JSeery and cas3
The link that was posted makes it perfectly clear that there is a difference in the inside diameter of the ring gear on the 59AB and the 8BA. Now I see it. Thanks.

[V8COOPMAN]

Originally Posted by Jay in Mass

JSeery and cas3
The link that was posted makes it perfectly clear that there is a difference in the inside diameter of the ring gear on the 59AB and the 8BA. Now I see it. Thanks.

Here's a pic that may help to visualize all the good info above. Note especially the clutch holes drilled all the way thru on the 8BA wheel. Also, ring gear height comparison makes it clear why starters don't work well with late wheels on early blocks, or early wheels on late blocks. DD

[Ronnie]

You can't install a ring gear on the wrong flywheel they don't interchange they don't fit each other due to sizing. Don't over think this.

R

[Walt Dupont--Me.]

Originally Posted by V8COOPMAN

Here's a pic that may help to visualize all the good info above. Note especially the clutch holes drilled all the way thru on the 8BA wheel. Also, ring gear height comparison makes it clear why starters don't work well with late wheels on early blocks, or early wheels on late blocks. DD

That's a good picture for those that don't know what there looking for. Some people are looking for a flywheel but don't what there looing for. With that pic they can see the difference in the width of the ring gear. Once you've seen the difference you won't forget it. Walt

[Jay in Mass]

V8COOPMAN
That picture of the 59AB and 8BA sitting next to each other makes it even better to see the difference.

Walt
Some day I hope to meet you. Do you still attend the Gathering of the faithful in Mass? I was a friend of Paul Howard. He was a great guy and perfect gentleman. Jay