Truck 400 to 460 swap

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Truck 400 to 460 swap

Post  bbf-falcon on November 24th 2015, 12:43 am

A guy called me today w/this problem that I couldn't answer. He has a 79 f250 with 400 standard(bull dog 1st gear deal).He installed a 1983 460 external bal.He purchased a new flywheel for that year 460. He is using the 400 bell, clutch/pressplate. He says the tranny will not pull all the way in to bolt up because he has ran out of splines on the front shaft.He says it lacks 1" from pulling up. He also says most of it is because the 460 flywheel is a lot thicker than the old one from the 400. What can he do to get this to work.
Thx for any help.

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Re: Truck 400 to 460 swap

Post  cool40 on November 24th 2015, 1:35 am

Clutch disc in backwards? confused if he's running out of spline on the input shaft he can't space the trans or it'll get out of the pilot bearing..... Question
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Re: Truck 400 to 460 swap

Post  bbf-falcon on November 24th 2015, 1:57 am

Are those standard bells on the 400 and 460 the same ?

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Re: Truck 400 to 460 swap

Post  whitefield on November 24th 2015, 7:54 am

3 finger pressure plate or diaphragm ? I agree with Lee I think the clutch disc is in backwards . If he still has a problem take the flywheel back and get a 390 flywheel and 390 clutch and pressure plate and it should bolt right up .
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Re: Truck 400 to 460 swap

Post  Wayne Pearce on November 24th 2015, 8:35 am

I found out the hard way that the 400 bell housing is about an inch shallower than the 460 bell housing. Both housings being factory originals.

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Re: Truck 400 to 460 swap

Post  rmcomprandy on November 24th 2015, 10:46 am

bbf-falcon wrote: Are those standard bells on the 400 and 460 the same ?

They ARE different depths ... by about .875" I think.

Remember that a 400 was never available in a car; only a truck.

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Re: Truck 400 to 460 swap

Post  bbf-falcon on November 24th 2015, 7:25 pm

So, sounds like he needs a bb bell huh

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Re: Truck 400 to 460 swap

Post  Wayne Pearce on November 24th 2015, 8:09 pm

I've been told that a 400 bell is usable with the right combo of flywheel, clutch, and starter motor, but an adapter is needed to space the transmission back. With all that hassle, I decided to go all correct pieces for my setup.

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Re: Truck 400 to 460 swap

Post  4speed on November 24th 2015, 9:45 pm

Use a 302 pilot bearing and install it into the inner/smaller recess hole..worked for us-A
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Re: Truck 400 to 460 swap

Post  Wayne Pearce on November 25th 2015, 8:24 am

Wow, that solution was right under my nose, and I didn't see it! Thanks for that tip!

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