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1970 C4 transmission upgrade help?

 
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89Gmcsierra
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Joined: 28 Oct 2012
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Location: Hazleton, Iowa
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PostPosted: Wed May 14, 2014 7:56 pm    Post subject: 1970 C4 transmission upgrade help? Reply with quote

im looking into upgrading C4 in my car. only thing. its 1 year only tranny. 69 down is 24/24 input shaft. 1970 is 26/26 input shaft and 71 up is 26/24 input shaft. not sure what exactly would have to be purchased to upgrade input planertary and input drum. never tore into a C4. heard is simple tranny but so many differences between years.

Any Help would be awesome,
Caleb
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Big Dave
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Location: Tampa Florida
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PostPosted: Thu May 15, 2014 12:35 pm    Post subject: Reply with quote

Sorry I can not offer any assistance as I am a Chevy guy.

What you are currently experiencing is Ford's "Better Idea", which is to change things as often as possible without backward interchange being an option.

I imagine that you will need the same tools as required to rebuild a TH350 as far as spring compressors, and snap ring pliers, etc. That said if you have not rebuilt an automatic I suggest you get a well illustrated book to find your way through the pile of parts. Once again I am a Chevy guy so I can not even recommend a good book to read. The book will list the parts that you need to upgrade the tranny. Since parts change so often (including after market parts) it will have to be a paperback book published in the last few years.

If I knew more about Fords I could recommend replacing your C4 with a C6 found behind big blocks unless I am mistaken. But I believe the big block Ford uses a different bolt pattern from the small block. I think even the FE differs from the 385 big blocks. May be Bam will chime in with the correct information.
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89Gmcsierra
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PostPosted: Thu May 15, 2014 7:21 pm    Post subject: Reply with quote

As far as taking it apart u can have it completely tore town in like 20-30 mins taking time. i've watched some videos. but im not sure if anyone knew exactly what i would have to change to beef up this tranny for transbrake behind next motor. 418W 12.5:1 abbots ported roush heads and so on. dont need to explode a transmission right away.
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Paul P
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Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Mon May 19, 2014 11:10 am    Post subject: Reply with quote

Check what you have and go with the higher spline count on the drum. I am sure there are a lot of aftermarket parts available for it from many different manufacturers.

I just searched and found these guys pretty quickly it looks like there is plenty of sources for hard parts for the C-4. I have rebuilt these transmissions and they are simple. You might be surprised. The C4 and Torque Flight are pretty much the same as far as design goes.

http://www.tcsproducts.com/media/1/TCS_C4_Performance_Parts.pdf


http://www.dynamicracingtrans.com/fordtranny.htm

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1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
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89Gmcsierra
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PostPosted: Mon May 19, 2014 4:00 pm    Post subject: Reply with quote

Every drum i find they dont say a spline count as 70 was 26 everything else was 24 so not sure about parts matching
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Tue May 20, 2014 4:03 pm    Post subject: Reply with quote

From what I recall the input shaft slides into the trans after you have finished rebuilding it. Why not get the best drum you can and input shaft from the same manufacturer and you should be all set. Torque converter wise it is easy also just tell the converter folks what you have. There are so many of these out there it isn't like you reinventing the wheel here although some might see it that way.
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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William Jones
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Joined: 30 Jan 2006
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Location: Lake city, FL
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1971 Ford Mustang

PostPosted: Thu May 22, 2014 9:35 pm    Post subject: Reply with quote

Everything in a c4 is pretty much interchangeable. I run a modified stock drum with a hardened input shaft and a transbrake with good clutches and bands, well into the 9s. The only other non stock parts are a billet servo cover and servo brace.

Bam

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Paul P
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1971 Chevrolet Chevelle

PostPosted: Fri May 23, 2014 6:09 pm    Post subject: Reply with quote

There ya go. I thought that was the case. These are very common.
_________________
2001 Focus 2.0 Zetec
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1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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