[Guest]

I'm new to this site. Congratulations for a wonderful site. I hope you can help me with my trans problem.

Trans is a C4. Car is a 67 Mustang I6 200cid. A couple of months ago I removed the trans from the car. Being new to a/t and to this car, I comitted a very stupid mistake in bolting it back. I re-installed the trans with the converter on the engine!!!

I then proceded to tighten the bellhousing bolts. Obviously, I felt resistance and thought that something was wrong. I corrected my horrendous error and drove the car. It seemed that the ATF was not circulating. After a few minutes, I can sense that the trans is heating up. To make matters worse, ATF level is diminishing everytime I drive the car. Car can barely move.

I again removed the trans and ATF spilled from the bellhousing. With the trans out again, I noticed that the shaft(input?) is stuck. I can't remove it by hand. This got me thinking that the pump drive might have been damaged.

Can I use a pump drive from a V8 C4 to replace the damaged one? How hard is it to do this swap? Thanks.

 

[66emberglow]

If you force the bellhousing on without getting the TC and input shaft aligned, you will break the front pump. Sounds like that's what happened. You should be able to use any front pump from any C4 tranny.

It's better to do it yourself twice than it is to pay someone once. At least you've learned something in the process. And that's the fun part of this hobby.

Good luck.

 

[66emberglow]

To paraphrase Rush Limbaugh, "I like what I said, and I liked how I sounded when I said it." So much so, I've made it my new signature quote.

Have a nice day.

 

[Guest]

My proposed "donor trans" is a C4 from a '72 Comet I6 250. Am I right in thinking that this is the same trans except for the bellhousing(w/c is for SBF)? Thanks.

 

[66emberglow]

I believe that's correct. I have been told that there are other differences inside like frictions and steels, but I think the pump is the same.

 

[Guest]

I just hope it's the same and replacing it will fix the problem.

Happy Holidays!!!

 

[Art]

<blockquote><font class="small">In reply to:</font><hr>

I just hope it's the same

<hr></blockquote>

It's not!
In 1970, C-4's went to a larger input shaft. You'll need a pump from a small input early C-4 (65-69)

 

[66emberglow]

I defer to Art. He knows much more about this subject than I.

 

[camachinist]

As Art mentioned, you'll need the correct 24 spline input pump to match your torque converter. I would suggest, in light of your experience, that you have a shop do the pump swap. There's lot's of little things to consider while doing it and I think, in the end, your Xmas will be somewhat merrier if you let a pro handle it. Might not be a bad time to install a shift kit, since the valve body will be out anyway.

Have fun!

 

[66emberglow]

Hooey. It's all in the shop manual.

 

[Guest]

Thanks for the info, guys. I still have one alternative. I also have a C4 from a '68 302. Can I switch bellhousings and use this trans on the I6 200?

 

[camachinist]

Hooey. It's all in the shop manual

Well, of course it is, along with the proper way to install the trans on the engine, which our poster either neglected to follow or didn't have the manual to follow or the requisite mechanical background to understand. Hence my advice to let a shop handle the replacement. A lot of things can go wrong when pulling a pump out and installing a new one that folks unfamiliar with the guts of a C4 can miss. Especially when putting the pump out of another transmission in.

I never recommend a shop unless I think it's in the user's best interest. This time I do.

 

[camachinist]

I also have a C4 from a '68 302. Can I switch bellhousings and use this trans on the I6 200?

My instincts are yes, with the caveat of checking the extension housing length and mounting arrangement and comparing to the OEM trans. Only other thing I can think of is checking the shift and kickdown levers to see if they orient correctly and are for the same shifter arrangement.

Let us know what you find out...

 

[Guest]

Will compare the two trans and let you know of visual differences.

Thanks, again.

 

[johnpro]

You will need to switch bellhousings AND the torque-converter, since the I-6 uses the "integral" converter/flexplate, and they are 2 seperate units on the V8's. If you do that, you can probably swap them, and have a much better trans in the end. Look at the shifter, to make sure it's for a floor shift, and not a column shift. If'n it's a column shift, you'll need to pull the valve body out of both trannies to swap the shifter arms. Same holds true for the kickdown arm.

 

[johnpro]

Totally agree. When I bought the '70 C4 we originally put in my '66 (later swapped to my son's '65), the tranny shop I bought it from gave me a '66 torque converter. Trying to install that onto the larger '70 input shaft was like puting a square peg in a round hole ... it just doesn't work!

 

[Guest]

John, this is what I'm worried about. Will the flexplate/converter from my 68 302 bolt on directly? Do I need to adjust/compensate for spacing issues? Both are floor shifts. Thanks.