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1990 F-250 trans swap flexplate issues

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Old 07-23-2013, 02:23 PM
mortenauthen mortenauthen is offline
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1990 F-250 trans swap flexplate issues

I have a 1990 Ford F-250 with a 7.3D and C6 automatic transmission.

I'm currently doing a transmission swap to a 4R100, with a 6-bolt pattern torque converter.

The existing flexplate has a 4-bolt pattern and is externally balanced.

Which flexplate can I use, and where can I get it?

Thanks for any help!
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Old 07-23-2013, 03:41 PM
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welcome to FTE.
you will never get the 4R100 to work properly. you need a computer to make the trans work, and the 7.3 in the 90 is a non computer engine.
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Old 07-23-2013, 04:37 PM
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You need a four stud converter from an E4OD.
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Old 07-23-2013, 04:43 PM
mortenauthen mortenauthen is offline
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Originally Posted by tjc transport View Post
welcome to FTE.
you will never get the 4R100 to work properly. you need a computer to make the trans work, and the 7.3 in the 90 is a non computer engine.
Hi and thanks. I'm aware of that. I have a Compu Shift II TCU so that is not an issue, the issue is the flexplate...
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Old 07-23-2013, 04:45 PM
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Originally Posted by trackspeeder View Post
You need a four stud converter from an E4OD.
Thanks, but the flexplate teeth are also damaged, so I will need a new flexplate anyways. The new converter has a better lockup discs, and a different stall speed. I need the flexplates.
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Old 07-23-2013, 06:00 PM
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You could possibly redrill a 4 bolt one. I just pulled the engine out of a 7.3 IDI with an E4od and have the flywheel. PM me if you need it.
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Old 07-23-2013, 08:04 PM
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Originally Posted by mortenauthen View Post
Thanks, but the flexplate teeth are also damaged, so I will need a new flexplate anyways. The new converter has a better lockup discs, and a different stall speed. I need the flexplates.
Dealing with the converter is easier. If its a stock spec six stud converter it will be a little better than the four stud converter. The easy way to make a 4R work with an IDI is use the four stud converter from an E4OD. You can get these in any spec you want. $$$ is the limit.

If you want to use a six stud converter, you might get away with drilling the late stamped style flexplate.
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Old 07-23-2013, 08:04 PM
 
 
 
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