tranny swap
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tranny swap
hey guys,
i asked the question on another form. Presently i have a 1970 f-100 2wd 300ci with a three speed on the tree. due to recent gas prices i want to make it a 4 or 5 speed on the floor. My question is what tranny(s), if any, would bolt up easily without any backyard engineering? Know i probaly i am going to need transimission mounts, driveshaft, and possibly reshapaping the floor pans. I would like to stay away from the floor plans if possible. Any help would be greatly appricated.
Thank you
i asked the question on another form. Presently i have a 1970 f-100 2wd 300ci with a three speed on the tree. due to recent gas prices i want to make it a 4 or 5 speed on the floor. My question is what tranny(s), if any, would bolt up easily without any backyard engineering? Know i probaly i am going to need transimission mounts, driveshaft, and possibly reshapaping the floor pans. I would like to stay away from the floor plans if possible. Any help would be greatly appricated.
Thank you
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
I found and read your other post. I will try to enlighten you a little. Your engine is carburated and your tranny output is 1 to 1. Most 4 spds have output ratios of 1 to 1. The 5 spd that I think you are refering to is an overdrive that is like .7 to 1 outpute ratio, meaning that in it's highest gear the tailshaft of the tranny is now turning faster than the engine.
Fuel injection engines can make much more power than carburated, and the overdrive tranny was successfully used with them. It is debatable if your current engine can run the overdrive tranny and you be happy with the results.
The 5 spd trannys also use a hydrolic assist (wet) clutch that uses a completely different operational arm to operate it.
None of the ODs can be used without some mods that I am aware of. The automatic like the AOD would be much less trouble to install, but has some issues to overcome.
hope this didn't confuse you more.
John
Fuel injection engines can make much more power than carburated, and the overdrive tranny was successfully used with them. It is debatable if your current engine can run the overdrive tranny and you be happy with the results.
The 5 spd trannys also use a hydrolic assist (wet) clutch that uses a completely different operational arm to operate it.
None of the ODs can be used without some mods that I am aware of. The automatic like the AOD would be much less trouble to install, but has some issues to overcome.
hope this didn't confuse you more.
John
Senior User
Joined: Dec 2001
Posts: 396
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From: Ohio
I had a 240 I6 in my '67 F-250. I got my idea from the fact that my buddy had a 1992 F-150 with a 300 I6 in it. I knew that a block is a block and set out on finding myself a donor tranny.
I successfully swapped a M5OD out of a 1990 F-150 into my '67 with very few mods that any back-yard shade tree guy could do.
The tranny itself was a direct bolt up. I did have to find a donor flywheel that was externally balanced, but that is no big deal. I modified the original clutch pedal assembly to allow the original pedal to work and had only to drill two holes in the frame rails to relocate the tranny crossmember.
I also wrote an article for the bleeding of the hydraulic clutch set-up.
All in all, it was a very easy swap. By all means, let me know if you have any questions. I'd be glad to answer anything that I can.
Ken
I successfully swapped a M5OD out of a 1990 F-150 into my '67 with very few mods that any back-yard shade tree guy could do.
The tranny itself was a direct bolt up. I did have to find a donor flywheel that was externally balanced, but that is no big deal. I modified the original clutch pedal assembly to allow the original pedal to work and had only to drill two holes in the frame rails to relocate the tranny crossmember.
I also wrote an article for the bleeding of the hydraulic clutch set-up.
All in all, it was a very easy swap. By all means, let me know if you have any questions. I'd be glad to answer anything that I can.
Ken
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Originally Posted by J&T's 67
You might be able to save alot of money and still get better mileage with a gear swap.
John
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