1978 Engine and trans swap question
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New User
Joined: Aug 2007
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1978 Engine and trans swap question
I just bought a 78 F 150 4X4 has 351M and FMX trans. Have rebuilt 71 429 built into a 460 I want to put into the truck. Question is will the FMX trans last long with 460 power? Planning on pulling trailers. Also the 460 has larger torque converter pilot. Should I swap for a C6 trans? What parts should I need?
Cargo Master
Joined: Dec 2004
Posts: 2,232
Likes: 3
From: NE Texas
If it is the factory transmission, it is a C6 and it should hold up okay as long as it is not driven in an abusive manner. You may already know this, but the bolt patterns of the 351M/400 family and the 460 are the same. There may be a pilot issue as you suggest, but I'm sure that someone here has been through this before.
You might try searching pilot. It might be as easy as changing to a different pilot bushing.
Good luck,
You might try searching pilot. It might be as easy as changing to a different pilot bushing.
Good luck,
New User
Joined: Jan 2008
Posts: 0
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DA3, Trans G, Axle 16J
Yes it does.
DA Kint/Vinly Bench seat in Black
3 = Flareside box
Trans G = Automatic = C6
16 - 3.50:1
J = Power steering
Transmission Ident
http://www.technicalvideos.com/ident...smission.phtml
Yes it does.
DA Kint/Vinly Bench seat in Black
3 = Flareside box
Trans G = Automatic = C6
16 - 3.50:1
J = Power steering
Transmission Ident
http://www.technicalvideos.com/ident...smission.phtml
Last edited by Mil1ion; Aug 19, 2007 at 07:21 PM.
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Thank you all for the information. Perhaps you can tell me what transfer case it has. Only numbers I can find on it are C11415 and 9X15X. Do you all think the 3.50 rear end ratio will be alright with the 460? When I put the 460 in do I just need 460 motor mounts? Or do I need other adapters?
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More Turbo
Joined: Feb 2004
Posts: 572
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From: Spring Hill, TN
If your transfer case is full time you have a NP203, if part time it will be a NP 205. I am getting ready to do the same swap in my son's 79 Bronco. You might need a different oil pan with the sump in rear. L and L products have motor mounts,oil pan, and headers. You also get them from Jeff's Bronco graveyard.You might also look at getting a bigger radiator.
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