Early 904 to later slant six conversion.

[6pak]

Im putting an 81 225 into my 62 Valiant.
I understand they WILL go together, but the OD of the tq converter nose is significantly smaller than the tail of the later crank.
The flex plate should not be relied to take up the difference.
I heard someone makes a “bushing”?
I don’t know who….
Can anyone give me the dimension of the outside nose of the early pushbutton 904?
Anything I leave out?
Early or Late flex plate?

 

[Professor Fate]

Pardon Our Interruption...

You'll also need the early oil pan and pickup, dipstick and tube.
You'll need to run the early carb too, since the throttle linkages are different ('62 has a mechanical bellcrank type throttle, '81 has a cable throttle).

 

[6pak]

Pardon Our Interruption...

You'll also need the early oil pan and pickup, dipstick and tube.
You'll need to run the early carb too, since the throttle linkages are different ('62 has a mechanical bellcrank type throttle, '81 has a cable throttle).

I figured I would use those parts from the take out engine. W some linkage mods to run a larger carb and retain the trans kickdown.
My concern is the transmission mating.
The newer engine has a larger ID in the end of the crank and the early 904 has a smaller OD on the nose of the converter. I figure the outer mounting holes on the flexplate should not be relied to maintain concentricity to the converter. Looking for longevity.
Also heard I may need a later flex plate.

 

[Charrlie_S]

Use the late flexplate, and the crank adapter bushing. Bushing can be had from member @slant six

 

[Professor Fate]

The newer engine has a larger ID in the end of the crank and the early 904 has a smaller OD on the nose of the converter. I figure the outer mounting holes on the flexplate should not be relied to maintain concentricity to the converter. Looking for longevity.

That's the link I posted.
For some reason EBay labels them all with that stupid "Pardon Our Interruption" tag now.

 

[transman]

Im putting an 81 225 into my 62 Valiant.
I understand they WILL go together, but the OD of the tq converter nose is significantly smaller than the tail of the later crank.
The flex plate should not be relied to take up the difference.
I heard someone makes a “bushing”?
I don’t know who….
Can anyone give me the dimension of the outside nose of the early pushbutton 904?
Anything I leave out?
Early or Late flex plate?

The diameter of the hub is 1.550", I think that there is only one flex plate. A converter builder can make the front (engine side) cover with the proper sized hub. I know that some have suggested the bushing, but personally I'm not a fan of doing that. Good luck.

 

[6pak]

Use the late flexplate, and the crank adapter bushing. Bushing can be had from member @slant six

How do I contact?

 

[Charrlie_S]

The diameter of the hub is 1.550", I think that there is only one flex plate. A converter builder can make the front (engine side) cover with the proper sized hub. I know that some have suggested the bushing, but personally I'm not a fan of doing that. Good luck.

Why don't you like the bushing? The bushing is a lot less mony that a special converter mod.
PS: there is also a late flex plate, and an early flexplate. The bolt pattern is the same, but the center hole is a different size.
PPS: The early flexplate with the small center hole is getting hard to find, but there is an adapter bushing to enable the late flexplate/flywheel to be used on the early crank.

 

[Charrlie_S]

How do I contact?

Click on the @slant six and send a PM.

 

[6pak]

I followed the ebay link.
Thanks a bunch.
But, I have comprehension problems with instructions.
The bushing goes where? I figure on the end of the crank? Then flex plate on. And assembled slipping thru onto the nose of the converter. Mating the block to the tranny. And then clocking and attaching the flex plate to the converter.
Do I have this right?
I appreciate your guys patience with my slow aptitude.

 

[Professor Fate]

Yes, the bushing gets pressed/driven into the pocket in the rear of the crank, in the flange; sorta like a big pilot bushing.
When installing the convertor, test fit it onto the crank/flexplate. There is one offset bolt- find it and mark that position on both the convertor and flexplate with a paint daub or a Sharpie mark. This will save you time and frustration later when bolting things together.
Install the convertor onto the transmission, making sure the convertor hub fully engages the drive tangs on the pump. Then bolt the transmission to the engine, then bolt the convertor to the flexplate after aligning the marks you made previously. There will be around a quarter inch gap between the flexplate and the convertor, this is normal- just let the convertor slide a little forward and the gap disappears, bolt it up tight.

 

[transman]

Why don't you like the bushing? The bushing is a lot less mony that a special converter mod.
PS: there is also a late flex plate, and an early flexplate. The bolt pattern is the same, but the center hole is a different size.
PPS: The early flexplate with the small center hole is getting hard to find, but there is an adapter bushing to enable the late flexplate/flywheel to be used on the early crank.

I just don't like the idea of the bushing. I know that some do, and that is their choice. Me, I'd go with the converter modification, and I'm not made of money either. And while they were doing the mod, get it rebuilt to ensure the converter was in 1st class condition. Again, just me.