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11-21-2021, 10:48 AM | #1 |
Senior Member
Join Date: Jul 2013
Location: Hayward Ca
Posts: 635
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C4 to torque tube
I am planing a flathead power to C4 automatic and would like to use original torque tube . Also any way to use 32-28 eng with C4 ? I have the speedway
Kit . But it only works with 49-53 eng. |
11-21-2021, 12:06 PM | #2 |
Senior Member
Join Date: May 2010
Location: Deer Lodge, MT
Posts: 658
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Re: C4 to torque tube
You might try this place. he may have some answers for you.
his bellhousing is smaller but requires special torque converter Gene: 5zero3 364-2934 (Oregon) https://www.flat-o.com/carproducts/flatomatic.htm |
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11-21-2021, 12:29 PM | #3 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
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Re: C4 to torque tube
Upgrading to an auyomatic transmission is a good improvement to a street rod. However this requires a major modifications to the frame. (Pre 49). another question, why the C4? exelent trans, ran one behind a stock Merc engine in my truck. A better choice whould have been an AOD.. Now, why Keep the stock rear? This is the weak link in a very expensive modification to the car/truck. I'd recommend a Spicer 35 from a Jeep Grand cherokee with 3.73 gears and posi. Very inexpensive amd neglected by most as , not strong enough.. Remember we're running a flathead not an LS.
Gramps. |
11-21-2021, 01:55 PM | #4 | |
Senior Member
Join Date: Dec 2010
Location: East Coast in CT
Posts: 1,529
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Re: C4 to torque tube
Quote:
To put the C-4 behind anything prior to 49 use the Flatomatic conversion that Dick wrote above. The Speedway conversion as you found out will not work for anything prior to 8BA era. Now the idea of putting the C-4 to a torque tube would be extremely difficult to accomplish. First issue is the transmission length the shortest C-4 was used in vans however they are hard to find and even that C-4 is still to long. The next issue would be getting the transmission connected to the torque tube the C-4 yoke is a fine spline into the tranny the U yoke needed from that point to the torque tube driveshaft is 6 or 10 spline anything like that would be a one off custom made part. Certainly not impossible to have made but also not a simple item to make. Then there's the bell flange needed on the transmission to connect to the rear. Somehow the rear of the C-4 needs to be modified to accept this arrangement that's going to be extremely difficult to accomplish. And then there's the question would the C-4 aluminum case be able to handle the load placed upon it from the torque tube since that's what places and keeps the rear axle assembly in place. The pushing load on the aluminum case may cause cracking. The C-4 is an outstanding transmission behind the flathead combined with a rear gear in the 280 to 290 range its dam near perfect . I've been involved in a number of flatheads converted to the C-4 based off the flatomatic design and the ford 8 inch rears or quick-change rears. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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11-22-2021, 12:50 PM | #5 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,436
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Re: C4 to torque tube
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The other method is to have a fabricated cross member that supports just the torque tube front ball and cap parts with the transmission driving into that with a standard U-joint connected to the driveshaft. The torque tube & shaft would likely still need to be shortened even with the shortest C4 you can find. This link to the HAMB has a photo from Pete about half way down the page. https://www.jalopyjournal.com/forum/...-3spd.1154845/ |
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