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Old 05-22-2020, 08:52 PM
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351W C4 flexplate etc...

In my 47 Ford coupe I am putting in a 351W from an 80s truck. The transmission is from a 71-72 302 Mustang (PEE AC4 D 27PDAJ25). I have determined that the transmission is a 157 tooth bellhousing (5.875" BH depth, and 10.50" T/C)
What I need to know is can I use a 157 tooth flexplate on a 351W? Can I retain the 351W's current harmonic balancer? Or do I have to get a new bellhousing/torque converter?

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Old 05-22-2020, 09:49 PM
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You can use the 157 tooth flexplate, just as long as it is 28oz balance factor

The 351W always used 28 ounce imbalance flexplate/flywheel, but the 302 was switched from 28oz to 50oz in 1981....since otherwise 221, 260, 289, 302 flexplate/flywheel is interchangeable with 351W, you have to make sure the imbalance weight is correct.

351W also always had a 28oz imbalance harmonic damper, so you don't have to change that.

No problem using your bellhousing and converter as long as you get the correct flexplate and matching starter.
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