Convert 460 from C6 to 4 speed toploader

[Kirbys73F100]

Thanks, I did a search on this conversion and learn a good bit. Seems like some people are even taking a grinder to the inside of the bellhousing for extra clearance. I also learned that L&L has several products to take some of the guess work out of this conversion. L&L Products

[Blown 331]

When I did my 351m to 460 conversion, the guy I bought my 460 core from also gave me a flywheel, pressure plate & clutch disc. He said it was all from a 390. The 390 and my 460 both internally balanced. It all went together like factory, no issues at all.

[Kirbys73F100]

Blown 331, would you venture to say that 360/390 parts are interchangeable? Say, if someone found a pressure plate, clutch disk and/or flywheel from a 360 for this swap?

[Kirbys73F100]

Okay just to recap for any readers convenience, here is a potential parts list needed to mate an internally balanced 460 (78 and older) with a ’76 NP435 from a 360 (FE block)

Parts needed if your doing a 351m/400 to 460 swap:
+Bellhousing from 351m/400/460
+Neutral balance flywheel from 460
+Clutch disk from 351m/400/460
+Pressure plate from 351m/400/460
+Throwout bearing from 351m/400/460
+Clutch pedal assembly from 78/79 (older models are different, maybe)

OR you can use parts from an FE donor, I personally would not mix FE/385 parts.
+Bellhousing from 351m/400/460
+Neutral balance flywheel from 360/390
+11” Clutch disk from 360/390
+Pressure plate from 360/390
+Throwout bearing from 360/390
+Clutch pedal assembly from 78/79 (older models are different, maybe)

This is the recommended swap for durability.
OR you can use parts from a 4 speed 460, 1983 is the first time Ford made this factory
+Bellhousing from 460
+Neutral balance flywheel from 460
+12” Clutch disk from 460
+Pressure plate from 460
+Throwout bearing from 460
+Clutch pedal assembly from 78/79 (older models are different, maybe)

*Note 1: for ’79 and older 351m/400 bellhousing; If using a 460 flywheel you will need to do some clearance work on the bellhousing and flywheel. The crank on a 460 extends a 1/2" deeper into the bell housing hence the problem with clearance. See note 2. But if you cant find one, use the 390 flywheel with 0 problems. To do this use a 390 input bearing turned down to the size of the bushing hole in your crank the inside hole not the outer one. This takes up the 1/2" extra on the crank have your choice of clutch indexed to the flywheel and your finished with that part.

*Note 2: for ’80 and newer 351m/400/460 bellhousing; No clearance problems

*Note 3: Trucks older than 77.5 may or may not have divorced transfer case. This means a 78/79 NP205/NP203 may not bolt up to the donor transmission from a 77.5 and older truck. I got my NP435 from a 76 F150 and the trans case (NP205) bolted directly to the transmission.

*Note 4: L & L products makes a kit containing all motor mounts and accessory brackets for 460 swaps.

***Please correct this if there are any anomalies***

[Blown 331]

I would assume the 360 and 390 take the same flywheel but I have no experience with this.
Also if you use parts from a 1983 460 the flywheel will not be neutral balance.
I think you have a good start going. I would probably go for it and pick up any extra parts you need as you go.

[bigdan1979f-250]

As to the discussion of the transmission to transfer case issue, I know that on the C-6 to transfer case there is a cast aluminum adapter used to connect/seal. I am almost positive the manual transmissions were the same way. It is about 5 inches long and just bolts to each component to join them.

[Old Brown Truck]

Theres very little difference between a 360 and a 390. The only difference is the rotating assembly (crankshaft ,rods, and pistons) Both are internally balanced. Both use the same flywheel. Most FE engine sizes are neutral balance. The exceptions are 410, and 428 (same crank) which have external balance and a counterweighting on the flywheel.

[Old Brown Truck]

Don't forget to acquire the casting that has the inner z-bar bushing on it. It bolts to two bellhousing bolts. Also the frame side z-bar bushing bracket that bolts to the frame.