1990 302 Engine Swap
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Joined: Jun 2011
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1990 302 Engine Swap
I have a 1990 F-250 with a bad motor in it. And a '91 with a good motor. They are both 302s. I am looking to swap the engines but have been told that since the 91 has an auto tranny behind it and the 90 has a manual they wont match up because ford drilled the crankshafts different for the 2 trannys. This doesn't make sense to me. I have never had issues with trucks having different trannys (manual vs. auto). I am planning on leaving the manual tran.s in it so i don't have to deal with all the other bull that comes along with that project. It seems that I would just need to change out the torque converter and flywheel for the auto and put the clutch and flywheel for the manual behind it. I am looking for a second opinion on this issue. Any help is appreciated. Thank you 
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
You will need a pilot bearing for the back of the crank. This is used to support the input shaft of the manual transmission. Any parts store will have it. Automatic transmissions have the torque convertor stick in the hole to align it, so those cranks don't have the bearing. That is the only real difference.
"IF" you were putting an automatic in where a stick was, then you would have to remove the bearing to allow the torque convertor to fit. When you pull your motor, compare the end of the cranks, and you will see what I mean.
"IF" you were putting an automatic in where a stick was, then you would have to remove the bearing to allow the torque convertor to fit. When you pull your motor, compare the end of the cranks, and you will see what I mean.
Logistics Pro
Joined: Jul 2009
Posts: 3,635
Likes: 3
From: Lansdale, PA
Yup. You're totally correct.
Now if the donor was older then 84-86 it would be different because that was around the time they went from 28oz to the more current 50oz balance. 351s were later as well.
It's an easy bolt in swap.
Have fun. Ask more questions if nessisary.
Now if the donor was older then 84-86 it would be different because that was around the time they went from 28oz to the more current 50oz balance. 351s were later as well.
It's an easy bolt in swap.
Have fun. Ask more questions if nessisary.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Except for the pilot bearing that is the only difference in these motors so this is an easy swap, and just to eliminate the possibility of any other vehicle differences do not use any wiring from the donor truck.
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