ZF6 transmission swap

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1984dually

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Joined
Aug 31, 2013
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242
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Location
Malin OR
First Name
Danny
Truck Year
1984
Truck Model
C30
Engine Size
8.1L
Few years ago I swapped in a 8.1L/4L80E into my 1984 Dually. Been happy with it for the most part but the trans could use closer gearing. Wants to hunt gears sometimes on a pull up a hill(6% or so). One being too high and another too low. Looking at gear spreads between different transmissions and the ZF6 6 spd looks to fit the bill. 5th is 1-1 with only 1 OD gear. Question is has anybody done this swap? Any opinions would be appreciated. Thanks
 

Dale A

Junior Member
Joined
Feb 16, 2020
Posts
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Location
Bremerton Wa
First Name
Dale
Truck Year
1991
Truck Model
R 3500
Engine Size
454
Did you ever get the swap completed with the zf ???
 

1984dually

Full Access Member
Joined
Aug 31, 2013
Posts
242
Reaction score
47
Location
Malin OR
First Name
Danny
Truck Year
1984
Truck Model
C30
Engine Size
8.1L
Never got done. Finding a GM 2wd trans for a decent price is next to impossible. Plus what people are getting for the hyd clutch pedal assembles has made it too expensive for me. Looking into adding a Doug Nash OD unit that I can split the gears with.
 

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