transmission conversion
Thread Starter
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Laughing Gas
Joined: Jul 2001
Posts: 850
Likes: 14
From: Fayetteville, NC
transmission conversion
Has anyone converted from a C6 to a NP435? If so, how hard was it and what all was involved. I'm thinking about converting it to the NP435 instead of the C6. I can pick up a donor truck complete with everthing for around $400. After driving the Bronco with the C6 and my last F-150 with the NP435 the NP435 was a much better transmission for off road torque. I was real disappointed in the C6. Anyother helpful hints would be great too! 
Postmaster
Joined: Jul 2005
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What size of Engine?
Is the truck 4x2 or 4x4?
Other parts, depends on the answers above.
Is the truck 4x2 or 4x4?
Other parts, depends on the answers above.
- Need the clutch and brake pedal assembly which mount under the dash.
- Need equalizer bar, and linkages.
- flywheel, pilot bearing, throttle bearing, clutch disk, and pressure plate.
- Bell housing to fit your truck engine.
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
Before you go to the trouble of adding a stick shift, you should check the rear end gear ratios out.
The stick shift may have given you better grunt not because of the transmission but because the gear ratio in the axle(s) was lower.
Check it out, and if so, you may find it a lot cheaper, and definitely a lot easier, to change the punkins out - assuming they are Ford 9" rear ends.
The stick shift may have given you better grunt not because of the transmission but because the gear ratio in the axle(s) was lower.
Check it out, and if so, you may find it a lot cheaper, and definitely a lot easier, to change the punkins out - assuming they are Ford 9" rear ends.
Postmaster
Joined: Jul 2005
Posts: 3,248
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Having a donor vehicle, will make for a smoother conversion.
What years the bronco? and what year the F150?
What years the bronco? and what year the F150?
- Drive shaft might need to be modified (shorthen or lengthen).
- Floor board Manual Transmission and Transfer case cover or will need to cut out NP435 transmission hole.
Last edited by 1975Ford; Jun 6, 2006 at 08:36 AM.
Senior User
Joined: Jan 2004
Posts: 166
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From: Masontown, WV
I have never done a C6 to a NP435 but I have swapped other automatics with a manual. It won’t be a bad job if you’re swapping from a truck of the same wheelbase. If not, you may have to get the driveshafts modified. That’s a big expense. And as stated before make sure it has a big bolt pattern on the bell housing to fit your 460. I’m not saying it will be an easy job because it won’t. The best advice I can give you is to look at the donor truck and look at your truck to see what is different and then imagine the swap.
Postmaster
Joined: Jul 2005
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- Use this conversion to replace any seals and u-joints.
- Might need to remove or drop the exhaust to allow more elbow room.
Last edited by 1975Ford; Jun 6, 2006 at 08:50 AM.
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Thread Starter
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Laughing Gas
Joined: Jul 2001
Posts: 850
Likes: 14
From: Fayetteville, NC
The Bronco and my first truck were both 78's, so is my current truck. I'm already going to have to have a drive shaft made for the rear of the truck as it originally came with a NP203 T-case. I'm using a NP205 t-case which is considerably shorter. The donor truck has a 351M in it which has the big block bolt pattern so that should not be an issue...I hope.
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