4 speed to ZF5 swap

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85rollback

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1986 6.9 idi 2wd F350 dually. This swap should be as straightforward as they get, but I still need help before I dive in. I currently have the factory manual 4 speed and it does run flawlessly. But I do need that overdrive to help with rpm's at highway speeds. I am installing a zf5. I do have a crossmember, and modifying the fork per some excellent pics on this forum will not be a problem. I have the money for a new flywheel/ clutch kit. Can y'all steer me toward the clutch kit I need? Also, any other tips would be greatly appreciated. Thanks!
 
Nero

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Get the Luk SMF kit, and get a separate throwout and pilot bearing, word is the kits come with poor quality bearings, but the flywheel and clutch are pretty good still.

Past that its all bolt in. You may need to modify your driveline to fit, not sure if the 4spd vs zf is different length.
 
KansasIDI

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Nero said:
Get the Luk SMF kit, and get a separate throwout and pilot bearing, word is the kits come with poor quality bearings, but the flywheel and clutch are pretty good still.

Past that its all bolt in. You may need to modify your driveline to fit, not sure if the 4spd vs zf is different length.
Click to expand...
4 spd is same length as ZF5
 
KansasIDI

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This is the easiest swap out there IMO, slave cylinder is the same
 
BlindAmbition

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C6 crossmember also works. Definitely get a new bearing, that LUK kit one is garbage. Kit is otherwise excellent
 
Jesus Freak

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1.5-2hr for a committed young man. A couple days for the less committed older gentleman. Afew weeks for the seriously tedious person.
 
BlindAmbition

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Took me a day having never done any transmission work before. I made some stands to lift the rear as high as I could, blocked the front wheels, and dragged the old trans out with a floor jack. Redid the rear main while I was back there as well. Made sure everything lined up with the tool and it slipped right in. Make some studs with all thread to use on the bottom holes and it helps immensely
 
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