Swap to CJ7
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If you are referring to the pushrod 5.0 302, that was never available in the F350. It was available in the F150 and F250 in 1996 and earlier. The F150 used the light duty Mazda M5OD 5 speed, the F250 used the heavy duty ZF 5 speed. In older trucks, you may find a NP435, T18 or T19 4 speed.