Engine swap
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Senior User
Joined: Mar 2003
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From: Bashaw, Alberta
Engine swap
Currently I'm building a 1984 Ford F-250 4x4 C-6 auto. The 6.9 gave up so I purchased an entire 1978 F-150 with a 400 in it and C-6 2w drive it looks like the tranny is gone in the 78. By the looks of it, it looks like I'm going to have to get a different tranny and T case. I have a different tranny out of an 81 F-350 with a 351, but am kind of pressed for cash and don't want to buy a T case for the New Process 4-speed. But in the event that I do get some money and the C-6 in the 84 won't work I was wondering if I could mate an NP-205 up to it if not what would be a cheap but strong substitute.
What a jumble of info
What a jumble of info
Posting Guru
Joined: Dec 2000
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From: Campbell River, BC Canada
Engine swap
I think we are not sure of what exactly you are trying to do.
Is the 351 a Windsor or an M. If its an M the tranny should be fine except you would have to use a remote t-case with a 4x2 tranny, (can someone tell me if I am wrong)
Your best bet would be to look for something that came stock in the truck if you are interested in simplicity, ie. <a href="http://www.motorhaven.com/">460 </a>with C6 or <a href="http://www.motorhaven.com/">351w </a>with C6. If you are not interested in simplicity then just make it work
Is the 351 a Windsor or an M. If its an M the tranny should be fine except you would have to use a remote t-case with a 4x2 tranny, (can someone tell me if I am wrong)
Your best bet would be to look for something that came stock in the truck if you are interested in simplicity, ie. <a href="http://www.motorhaven.com/">460 </a>with C6 or <a href="http://www.motorhaven.com/">351w </a>with C6. If you are not interested in simplicity then just make it work
Thread Starter
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Senior User
Joined: Mar 2003
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From: Bashaw, Alberta
Engine swap
The 351 is an M and what I was wondering was if I could mate the 1978 400 V-8 on a 78 C6 to a C6 in a 1984 4x4 that had a 6.9 diesel. I haven't pulled the motor out of the 78 yet. I was just wondering if the 78 C6 has the same bellhousing as the 84 C6 that was mated to a diesel.
mtyrell as for divorcing the T case mated to the 84 C6 it is a Borg Warner and I haven't heard of that being done. Also I don't think I could afford the kit to accomplish this if there was such a kit.
I do appreciate your suggestions though guys.
mtyrell as for divorcing the T case mated to the 84 C6 it is a Borg Warner and I haven't heard of that being done. Also I don't think I could afford the kit to accomplish this if there was such a kit.
I do appreciate your suggestions though guys.
Postmaster
Joined: Dec 2002
Posts: 3,594
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From: Southern Oregon USA
Engine swap
The 6.9 and the 78 gas bellhousings are different.
However, you can get a gas 4wd C6 to mate up to the BW transfer case in there now. They both share a 31 spline output and adaptor pattern. Keep in mind though that there are two different length adaptors available for the C6 to 205. You need to find the correct one with the same shaft stickout and adaptor length as your diesel trans.
Why don't you find a later 7.3 diesel to swap in and save the hassles? The 7.3 will get better mileage and has the potential to outpull even a built 400.
Jason
However, you can get a gas 4wd C6 to mate up to the BW transfer case in there now. They both share a 31 spline output and adaptor pattern. Keep in mind though that there are two different length adaptors available for the C6 to 205. You need to find the correct one with the same shaft stickout and adaptor length as your diesel trans.
Why don't you find a later 7.3 diesel to swap in and save the hassles? The 7.3 will get better mileage and has the potential to outpull even a built 400.
Jason
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From: Bashaw, Alberta
Engine swap
Thanks RCrawler for the info.
Now will the T-case on the 84 auto mate up to the 81 NP 435 or will I have to find a different T-case and Tranny all together. Since the NP 435 is a 2 wheel drive tranny is there a way I can use this tranny without a divorced T-case or am I hooped for that idea.
I already have a 7.3 and don't want another. I like for driving down the road because of the mileage it gets but it is lagging in horsepower and I can't afford a turbo at the moment. So I got a gas for the easy horsepower I can make. I don't really care about mileage since the 84 is going to be a trail rig. I already have the 400 so I really am not in favor for finding another motor.
Now will the T-case on the 84 auto mate up to the 81 NP 435 or will I have to find a different T-case and Tranny all together. Since the NP 435 is a 2 wheel drive tranny is there a way I can use this tranny without a divorced T-case or am I hooped for that idea.
I already have a 7.3 and don't want another. I like for driving down the road because of the mileage it gets but it is lagging in horsepower and I can't afford a turbo at the moment. So I got a gas for the easy horsepower I can make. I don't really care about mileage since the 84 is going to be a trail rig. I already have the 400 so I really am not in favor for finding another motor.
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Postmaster
Joined: Dec 2002
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From: Southern Oregon USA
Engine swap
You can't mate the 435 to your transfer case. The output shaft would need to be changed. Does the 435 have the square pattern output adaptor bolt pattern? If it does, you are out of luck to just change the output shaft. The 4wds use what known as the A pattern adaptor. They don't make the 4wd output adaptor with the square pattern, so you would need to find a 4wd transmission case.
Jason
Jason
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Joined: Jul 2002
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From: Paola, KS
Engine swap
First off the tranny that is mated to your 6.9 will bolt directly up to the 400, because the 6.9/7.3dsl uses an adapter plate that is bolted to the block that makes it into a 351M/400-429/460 bellhousing pattern.
Last edited by Brian460; Apr 2, 2003 at 10:27 PM.
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Joined: Mar 2003
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From: Bashaw, Alberta
Engine swap
I already knew that the diesel used an adapter plate because I noticed it when I pulled it out of the truck. I think I'm going to go with RCrawler's advice and just find myself another tranny and t-case that will work on my 400. When I pulled the starter in prep for the removal of the engine in the 78 I noticed that it bolts in a little different than the diesels. I was going to pull the motor soon but due to some crazy weather up here in Canada it will have to wait.(It is snowing right now in April crazy considering we just had a week of 10 degree C weather.) I might as well find a Dana 60 to replace the weak TTB Dana 44 which I have noticed has a blown drivers side u joint.
Thanks for your advice.
Thanks for your advice.
Last edited by fordmudrunner2020; Apr 2, 2003 at 10:43 PM.
Posting Guru
Joined: Jul 2002
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From: Paola, KS
Engine swap
Well it is your money, but I have done the swap myself in an 85 that used to be a dsl and the tranny worked just fine.
Since the tranny worked fine there was no t-case issue.
Since the tranny worked fine there was no t-case issue.
Last edited by Brian460; Apr 2, 2003 at 10:43 PM.