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how strong is a zf 5 speed, can it handle a healthy 390 or a diesel in an old highboy 250? i've only been around one and it is ready to go anytime now, but then of course its behind a 500 horse 460
The 385 series big blocks have a different bolt pattern from the FE series. The ZF could be adapted; given enough time and money, anything is possible. If you want to put a bulletproof 5 speed in a FE powered 250, you might want to consider Advanced Adaptors kit to put an NV 4500 from a Dodge Cummins Diesel in a Ford. The kit's not cheap and neither is the tranny, but it's wrth looking into.