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tranny swap

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Old Mar 18, 2013 | 07:23 PM
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tranny swap

I have a 86 f250 6.9idi 4x4 and it has a c6 auto and I was wondering does the 6.9 have the same imput diameter as the small v8 Ford motor. I have a t18 from a 78 f150 and was wondering if the tranny would fit the 6.9
i
 
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Old Mar 18, 2013 | 07:38 PM
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Nope ford diesels use a fairly uncommon bolt patter called SAE #2 I believe and a gasser tranny won't bolt up.
 
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Old Mar 18, 2013 | 07:47 PM
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I know the t18 has the typical 4 from the tranny to bellhouseing,so couldn't I just use a diesel bellhouseing for a diesel that came off a 4sp
 
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Old Mar 18, 2013 | 07:54 PM
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I don't know the answer to that but I do know that the t-19 is a bit beefier than the gasser 4speed. When you lug a diesel it beets the hell out of trannys. Most of the time when people put like a 4 banger cummins in a ranger and use the ranger tranny it doesn't last long so I'd imagine the same for your situation. Sale the gasser tranny and get a diesel one would be my advice just to avoid problems down the road.
 
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Old Mar 19, 2013 | 05:01 PM
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From: Gadsden Purchase
Originally Posted by trumsey07
I have a 86 f250 6.9idi 4x4 and it has a c6 auto and I was wondering does
the 6.9 have the same imput diameter as the small v8 Ford motor. I have a
t18 from a 78 f150 and was wondering if the tranny would fit the 6.9
You talkin about the pilot bearing inside diameter? :)
If so, they are the same they're 17mm (.6733").

Outside diameter of the splines can vary tho 1+1/16" for the T18 and
Rockauto.com sez your truck too if it had a ZF in it.

Some Fords can be 1+1/4", have no idea which ones, just ran across
that fact in my reading is all. xD

Alvin in AZ
 
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