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We have two Broncos with 4BTAAs and ZF 5-S42.
One of them is on its 3rd ZF!
Not again, next time it will be a NV4500.......
If you build a 4Bt, to say 400hp (for round numbers) you have two power pulses of 100hp per revolution. That is a major shock-load for any tranny. that is a shock load not seen in engines with more cylinders.