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How many teeth flywheel for a 78 400?

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Old 12-07-2018, 05:08 AM
hail destroyer
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How many teeth flywheel for a 78 400?

How many teeth flywheel do I need? 180t or 176? I'm swapping from a 351M to a 400 in a '78 f250 4x4 with NP435 4 speed. Thanks again!
 
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Old 12-07-2018, 10:08 AM
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I only know of 180 tooth 400 flywheel
 
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Old 12-07-2018, 03:06 PM
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Originally Posted by hail destroyer View Post
How many teeth flywheel do I need? 180t or 176? I'm swapping from a 351M to a 400 in a '78 f250 4x4 with NP435 4 speed. Thanks again!
351M uses an 11" clutch, 400 uses a 12" clutch, but the 180T flywheel ring gear is the same for both.

D7TZ-6384-A .. Flywheel Ring Gear - 180 teeth / Obsolete

1977/79 F100/350 351M/400 // 1978/82 Bronco 351M/400 // 1980/82 F150/350 351M/400 /// 1983/97 F250/350 460.
 
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Old 12-10-2018, 12:31 PM
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Easier way to do it...

The 351M/400 flywheel is the same casting with different bolt holes. You do not need to buy a new flywheel. Here are your options:
1. Have a competent machine shop drill your existing flywheel for the 12" pressure plate. Mine cost $35.00
2. Use the 11" setup with no fear. If a 440 sixpack or an Olds 455HO or a Pontiac Super Duty 455 can use an 11" clutch, so can your 400.
This is the real answer. I used a 12" clutch because I had bought all the pieces at bargain prices and it cost less to redrill the flywheel than to buy a new 11" clutch kit.

R.
 


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