Hello everyone,

I have a 455 that is currently in a 69 442 with a Munice 4 speed. I want to take this motor out and put it in another 69 442 which has a TH400 auto trans in it. I understand from searching the site that going from auto to manual requires some machine work on the crank but I am not finding any information on what modifications need to me made (if any) going from a manual to automatic. Any help on this would be appreciated. Thank you.

 

All you need to do is swap the flywheel for a flexplate and add the metal vacuum line for the modulator.

 

Come on Joe!! You forgot about the shifter!! A four speed shifter is of no use with an automatic. 😂😁

 

I think the driveshaft yolk is different,maybe length too.

 

Or.... You could go back and re-read the first post.

 

I'd also go ahead and remove the clutch pivot ball from the block and put it away in storage somewhere you can find it later (ask me how I know). You'll need it, or someone will, when/if installing another engine in the 4-speed car. If you leave it in and sell the car, it'll be long gone. Same with that MT crankshaft you'd lose, but that's not an easy swap out so you could simply forego that as a cost of doing the swap.