Manual to Automatic Conversion

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Sep 16, 2005 | 09:07 PM

mrkrinkle

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Joined: Jun 2005

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From: Anchorage

Manual to Automatic Conversion

Hello all...I'm hoping someone can help me out. I have a 74 f250 with a 390, np435 tranny and a np 205 divorced transfer case. I would like to convert it to an auto. I have a rebuilt c6 that is ready to bolt to the 390. The c6 has the output shaft for the 4x4. I have already taken out the manual and am ready to bolt up the auto. But after bolting on the flexplate to the crank and then trying to bolt the auto to the motor I find that the middle of the torque converter is hitting the crank not allowing a flush mount. I seams as though I am missing a spacer or something but I am not sure. If anyone could help me figure out what I am doing wrong I would really appriciate it.

Thanks,
Keegan

Sep 16, 2005 | 10:02 PM

Fordbronco69

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Joined: Aug 2003

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From: Elkhorn WI

Did you take out the brass pilot bushing that was in there for the 4spd, its at the back of the crank. Im doing the exact same thing right now....and i have yet to take that out.

Sep 19, 2005 | 01:26 PM

mrkrinkle

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From: Anchorage

No I haven't. Does this just need to come out? Or do I need to replace with one for the auto?

Thanks for the help
Keegan

Sep 19, 2005 | 07:32 PM

Fordbronco69

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From: Elkhorn WI

Yes it needs to come out, I had to take a die-grinder and grind it out of there. You dont replace it with anything, the back of the torque converter goes there.

Sep 19, 2005 | 08:44 PM

Thudpucker

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Joined: Jan 2000

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From: Cullman Alabama

Do you guys need a reminder on installing the C-6, to Rock the Tq back and forth till you get the three clicks?

Sep 19, 2005 | 08:59 PM

frederic

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Joined: Oct 2003

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From: New Jersey

If the pilot bearing is flush with the crank flange, just install the flex plate over it and slap the torque convert onto the flex plate. They are difficult to get out (there is a common tool for it BTW) so unless it falls out, leave it.

I've left them there many times, never had one work loose yet!

Sep 20, 2005 | 07:22 AM

Spaznaut

Fleet Mechanic

Joined: Aug 2004

Posts: 1,276

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From: NE Tennessee

I always used the bearing grease method. Put bearing grease in the hole and use a hammer to drive in a the clutch alignment tool. This pushes the bearing out unless you have a roller bearing. Also some engines will have a different size pilot hole depending on year. While your in there you may wanna check your measurements just to be safe.