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I have a 63 Comet S-22. It had a 260 with a 2 speed Merc-o-matic. I installed a 289 the 2 speed matched. I then installed a cruise-o-matic it also fit. My problem is I took it to a Trans shop to have a AOD installed and was told that it did not match neither did a C4. My question is there something different about these 63 motors that the bell housing won't match? Do I need a adapter?

Thanks in advance for any help. laurelarry
 

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260 and early 289;s have 5bolt bells. you gonna have to find a 5 bolt C4 bell or change the engine to a later 6 bolt block and then you can run a AOD.Your limited with the 5 bolt block
 

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Yep! you can run a C4 if you can find a 64-65 bellhousing but the AOD has no way to fit the older 289 bolt pattern.
Your best fix is to transfer all your parts into a 302. It will bolt up to any of the transmissions for the 5.0L or 302.
Paul
 
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