3 Speed replacement - whats compatible?
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Senior User
Joined: Dec 2005
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From: Bryan, OH
3 Speed replacement - whats compatible?
I have a 1978 F150 with the bigger three speed trans. (Three on the tree)
I believe the trans housing is 9.25? Anyway, it's the larger one of the three speeds.
What year or model of transmissions are compatible for a replacement?
I have a lead on a 68 F100 three speed, but uncertain if it'll work?
1978 F-150 300ci
4x2 three on the tree
Single piece drive shaft
I believe the trans housing is 9.25? Anyway, it's the larger one of the three speeds.
What year or model of transmissions are compatible for a replacement?
I have a lead on a 68 F100 three speed, but uncertain if it'll work?
1978 F-150 300ci
4x2 three on the tree
Single piece drive shaft
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Ford type 3.03 3 speed (on the tree) manual all syncromesh transmission:
1963/83 F100 / 1963/86 F250 / 1966/77 Bronco / 1975/86 F150 // 1965/87 Econoline // Misc 1963/80 Ford/Merc Passenger Cars.
1968 same trans as 1978, but there may be differences in the length of the output shaft and extension housing.
Why not rebuild what you have as NAPA has all the parts.
1963/83 F100 / 1963/86 F250 / 1966/77 Bronco / 1975/86 F150 // 1965/87 Econoline // Misc 1963/80 Ford/Merc Passenger Cars.
1968 same trans as 1978, but there may be differences in the length of the output shaft and extension housing.
Why not rebuild what you have as NAPA has all the parts.
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They are supposed to be fairly easy to rebuild, but ymmv:
https://www.ford-trucks.com/forums/1...on-issues.html
If you have someone do it, make sure they are familiar with them or at least older manual transmissions in general. "I've never done one but how hard could it be..." is not a good response to the question.
https://www.ford-trucks.com/forums/1...on-issues.html
If you have someone do it, make sure they are familiar with them or at least older manual transmissions in general. "I've never done one but how hard could it be..." is not a good response to the question.
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Joined: Mar 2011
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I had a Three on a tree - Inline 6, years ago. The Trany went bad and I ended up getting a 4 speed (w/od) out of a mid 80's pickup. Cutting a hole in the floor for the shiftier, Mounting the "hump cover" and moving the lower trany mount off the 3 speed to the 4 speed is the only thing extra I had to do.
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