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  Swapping C4 Transmissions...

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Author Topic:   Swapping C4 Transmissions...
Boss Hoss
Gearhead

Posts: 222
From: Georgia
Registered: Mar 2001

posted 10-03-2001 10:30 PM     Click Here to See the Profile for Boss Hoss   Click Here to Email Boss Hoss     Edit/Delete Message   Reply w/Quote
I have a question about the difference between a C4 from the 1970's and a C4 from 1966.

I have a 1965 Mustang coupe with an incorrect C4 in it. It is a C4 from the 1970's...I'm not sure of the exact year, but if someone needs the year to answer my questions, I can check the case and provide that information.

I found a 1966 "green dot" C4 that I just had completely overhauled (at some great expense). It is much more similar to the original C4 that came with my car, and I want to put the 1966 C4 in and take the 1970's C4 out. Here are my questions:

What is the difference between the outside shift lever on these two C4's? I'm talking about the lever that sticks out of the body of the transmission and attaches to the linkage that connects it with the shift lever inside the car. I have reason to believe that the INTERNAL LENGTH of the transmission's shift lever is different, and there might be a chance that the shift lever currently attached to the 1970's tranny might not work in the 1966 tranny. Is this true? Could the shift lever on my 1970's tranny be THAT different?

Actually, I will have to swap the shift levers no matter what...the 1966 C4 has a COLUMN-SHIFT lever attached to it, while the 1970's C4 has a lever designed to work with floor shifters...I guess the question is: How likely is it that the floor shifter-type lever in the 1970's C4 will work inside the 1966 C4? The shift lever in the 1970's C4 seems to work perfectly with my car's shifter linkage...I am even wondering if the shifter on the 1970's C4 is my car's ORIGINAL shifter, swapped into the 1970's C4.

Also, what about the bellhousing? Will a bellhousing that fits a 1970's C4 fit a 1966 C4? My engine is a 289 V8 that uses a SIX-bolt bellhousing. The bellhousing on the 1970's C4 that is currently in the car SEEMS to mate up with my 289 perfectly well. So I'm assuming that the bellhousing will also mate up with the 1966 tranny. (The 1966 tranny has no bellhousing of its own.)

Thanks for any help someone can give me with this MOST confusing issue! Also, let me know if I am not being clear with my questions...it's late as I type this!

------------------
*andy* ([email protected])

also known as...***Boss Hoss***

*1965 Mustang 289 coupe*
*1996 Mustang GT coupe*

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franklin
Gearhead

Posts: 128
From: VA
Registered: Nov 2000

posted 10-04-2001 01:15 AM     Click Here to See the Profile for franklin     Edit/Delete Message   Reply w/Quote
I swapped a 68 c4 out of a v8 comet into my 65 and then a few years later a 73 c4 out of a 6cyl maverick into the same 65. Everytime, I had to take the original 65 shift lever and install it into the different tranny's to make it work, and it always fit ok. I bet what you are thinking is true, that's probably your original shift lever in the tranny you have now. I have never swappped bellhousings from trans to trans, so I don't know about that one. I do know sometime around 1970, ford changed the oil pump driveshaft diameter on the input of the trans. It is the smallest splined shaft on the input, that you can pull out. If you go to an early trans, make sure you get a torque convertor for it or the splines won't mesh. When I went from the 68 to the 73, I got it all in and the tranny lacked about 1/4" of meeting the engine. This is when I found out I needed a later torque convertor with the larger spline for the oil pump shaft.

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Moneymaker
Administrator

Posts: 18547
From: Lyons, IL, USA
Registered: May 99

posted 10-05-2001 04:45 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The shift select levers in all floor shift C-4 Mustangs from 65-70 are the same 6 or 8 cylinder, green dot or select shift. There is no inbternalk lenght differance as the slot in the valve body is the same size. SHifters will actuate regardless of pattern. Now we all know that Mustangs only came with floor shifts correct? Floor shift levers point up and column shift levers point down. The V-8 bell housing will fit the engines and transmissions. What you will have to watch out for is the flywheel/flex plate diameter and tooth count. 157 vs 164. I hope this helps.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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Boss Hoss
Gearhead

Posts: 222
From: Georgia
Registered: Mar 2001

posted 10-08-2001 08:05 PM     Click Here to See the Profile for Boss Hoss   Click Here to Email Boss Hoss     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
What you will have to watch out for is the flywheel/flex plate diameter and tooth count. 157 vs 164. I hope this helps.

Alex:
The 1966 tranny I have was originally mated with a 289. I will also be using a 289 with this tranny. Is there still a chance of the flywheel diameter being a problem, or do all 289 engines pretty much use the same flywheel? The reason I ask is because I intend to use my same old flywheel with this 1966 tranny.

------------------
*andy* ([email protected])

also known as...***Boss Hoss***

*1965 Mustang 289 coupe*
*1996 Mustang GT coupe*

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Moneymaker
Administrator

Posts: 18547
From: Lyons, IL, USA
Registered: May 99

posted 10-09-2001 12:39 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
All 64-70 small/mid size car V-8 C-4's used the 157 tooth flywheels. Big bodies and trucks used the larger bell housing and flywheel.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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