2005 MCS - 6spd Auto (Aisin TF60SN/09G) - Flexplate Cracked

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Feb 24, 2019 | 06:37 PM

BTRMayfair

Thread Starter

2nd Gear

Joined: Apr 2018

Posts: 54

Likes: 1

From: Baton Rouge, LA

2005 MCS - 6spd Auto (Aisin TF60SN/09G) - Flexplate Cracked

Pulled transmission - Aisin TF60SN - and rebuilt. New seals, frictions, steels, etc. Replacing valve body with remanufactured.

When pulled transmission also found flexplate cracked.

Concern is WHY did it crack... root cause determination before put back together.

2005 MCS 6 speed automatic CRACKED flexplate.

Feb 25, 2019 | 05:14 AM

Tgriffithjr

5th Gear

Joined: Jul 2018

Posts: 766

Likes: 80

From: Texas

They just crack from stress and use. It’s not uncommon to see it on any engine that has one including V8s. It’s called a flex plate because it’s suppose to flex. Anything that flexes enough will eventually crack. If all your converter bolts were in place and tight I wouldn’t be worried. You can try buying a good quality plate to avoid it in the future.

Mar 8, 2019 | 10:17 AM

BTRMayfair

Thread Starter

2nd Gear

Joined: Apr 2018

Posts: 54

Likes: 1

From: Baton Rouge, LA

Thanks for comments -- I've order another -- and will see if non-issue once replaced

Mar 10, 2019 | 09:03 AM

BTRMayfair

Thread Starter

2nd Gear

Joined: Apr 2018

Posts: 54

Likes: 1

From: Baton Rouge, LA

Closing the loop for any future forum searches.

Believe discovered root-cause of flexplate crack -- likely misalignment by the previous owners (non mini) shop that replaced automatic transmission about 10-15k miles ago. As I've removed transmission -- I've discovered many things this shop did wrong when reassembling -- the latest is that as started to put all back together -- discovered missing alignment dowels! Without these dowels -- I'm betting alignment was off far enough that ultimately flexplate cracked.