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I have a 99 F350 with 7.3. It scrubs bad shifting into 3rd and nothing in 4th. Feels like it's in neutral. I've got a 88 f350 7.3 parts truck, but was wondering if the 5 speed zf would be interchangeable with 99. I know ratio is different, and not as strong, but would it swap out? Thanks for any help.
 

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Should swap.
I have a zf from a 88 in my 94.

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Not sure when they switched to the zf6, but I would think it would bolt right up. Of course there would be a couple minor issues. 1) your cross-member might not work 2) the driveshaft might not be the correct length or u-joint 3) not sure about the zf6 slave cylinder, it might be different don't know. Regardless, I would check all of the above. Also the zf6 had a "cooler" attached to it I believe, so you're going to have a couple cooler lines hanging with no where to go (I suppose you could remove it all together.....).
 

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If zf5 to zf5, it's all the same.

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Obviously engine year.

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