Engine Tranny Swap
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Junior User
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Engine Tranny Swap
I have a 1990 Ford F150 Custom and it has a 4.9L and an E40D tranny in it.
I just recently aquired a 1984 F150 XLT with a 5.8L 351 and it has a tranny out of a F250 in it. Its not drivable as the body is completely shot. I would like to transfer the engine and tranny to my 1990. Can anyone offer any assistance if this is feasible. I dont have to worry about emissions or inspections. Thanks.
Both are 2 wd. The 84 is a extended cab and my 90 is a short cab longbed.
Thanks
PS my E40D slips alot. thats why i was asking.
I just recently aquired a 1984 F150 XLT with a 5.8L 351 and it has a tranny out of a F250 in it. Its not drivable as the body is completely shot. I would like to transfer the engine and tranny to my 1990. Can anyone offer any assistance if this is feasible. I dont have to worry about emissions or inspections. Thanks.
Both are 2 wd. The 84 is a extended cab and my 90 is a short cab longbed.
Thanks
PS my E40D slips alot. thats why i was asking.
Posting Guru
Joined: Dec 2002
Posts: 1,297
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From: Billings MT
Engine Tranny Swap
So, you are going from EFI to carb'd? I would say it would work, but here is the deal:
New motor mounts(no big deal but you have to get them for a 351 in a 1990
Tranny mounts all depends on what tranny is with the 351
Fuel pumps are a big issue(carb'd can't handle the fuel pressure EFI needs) so you would have to put a regulator to drop it back down to 4-8psi
If the tranny with the 351 isn't computerized, no big deal there, but if it is you'll need the computer to go with it
Lastly, you'll probably need a new driveshaft made
This is what I would think is involved, at a minimum.
New motor mounts(no big deal but you have to get them for a 351 in a 1990
Tranny mounts all depends on what tranny is with the 351
Fuel pumps are a big issue(carb'd can't handle the fuel pressure EFI needs) so you would have to put a regulator to drop it back down to 4-8psi
If the tranny with the 351 isn't computerized, no big deal there, but if it is you'll need the computer to go with it
Lastly, you'll probably need a new driveshaft made
This is what I would think is involved, at a minimum.
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Fuel pump and more
Couldnt I use the original fuel pump from the 84? I plan on towing it to my house next wednesday so i will have the whole truck. could i not use the old drive shaft? I have a single cab long bed and the donor is a supercab shortbed. As far as I know the tranny is not computerized either a c4 or c6 i believe, and it is carbed, any idea on the HP ratings for a 84 F150? Thanks for the info!
Posting Guru
Joined: Dec 2002
Posts: 1,297
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From: Billings MT
No, the electric fuel pumps will not let you "siphon" gas out of the fuel tanks through the pump. Now, if you wanted to change the fuel tanks, that is a posibility.
Most trannies have different lengths of tail shafts from one another. Also, I saw somewhere that a extended cab shortbed and a standard cab longbed are not identical wheel bases. I don't know on that, but I was basing on the fact that the length of a E4OD and a C6 are more than likely different.
Most trannies have different lengths of tail shafts from one another. Also, I saw somewhere that a extended cab shortbed and a standard cab longbed are not identical wheel bases. I don't know on that, but I was basing on the fact that the length of a E4OD and a C6 are more than likely different.
