I hear you guys talk alot about c-4 and t-5 and other various tranny's. My question is that in my 67, I have a manual 3-speed. Is this refferred to as c-4?

I'm also leaking alot of oil out of the transmission, how much would it be to rebuild?

thanks for the clarifications
mark

 

What you have is referred to as the "Top Loader 3 speed" or "3 Speed". Do not get this confused with a "Top Loader 4 speed". When people refer to a "Top Loader" 90% of the time it's the 4 speed(commonly called that because the gears load in from the top of the unit). The tranny you have is a good unit. Getting one rebuilt may be difficult, but call around to some shops. Most of the time the leak(s) are just common gaskets that can be replaced on a bench w/o much trouble. Leaks generally happen from overfilling the units.
C4,C5,C6,FMX and AOD are different styles of automatics. 3 speed,4 speed,T5,T6 are different styles of manual shift transmissions.

 

Ford used several transmissions in the Mustang over the "classic" years. Including 2 different 3 speed manuals, 3 different four speed manuals and atleast 3 different automatics.

The C4 automatic was used with 6 and small block V8. Even though both were "C4" transmissions, there were internal differences and the I6 version was "weaker" than the V8 version. Since you do not have an automatic I'll stop with discussing it, but those interested in Ford automatics should check out
http://www.becontrols.com/tech/ch1alphabet.htm

The two different three speed manual transmissions were the 2.77 used with I6 engines in 64-66 and the 3.03 used for all otner classic Mustangs with three speed manuals. The 2.77 was a weak transmission and first gear was not syncronized. You needed to come to a complete stop to put the car in first. The 3.03, the only three speed manual available in 67 has full syncronization and is a very durable transmission. It is actually a three speed version of Ford's bullet proof top loader. The only problem is that it is a three speed (duh). This means you have a relatively large drop in rpm when shifting from 1st to 2nd and 2nd to 3rd. These are relatively straight forward transmissions. A compentent DIY mechanic should be able to rebuild one, parts kits for a complete rebuild are available on the net for ~$110. I didn't find any remanufactured 3.03 transmissions for sale on the internet. If you cannot do DIY then you should be able to get a quote from your favorite transmission shop. Everyone wants more gears or an automatic.

Three different four speed transmissions were used in the classics. The weakest was the Dagenham 4 speed used in early cars. This was replaced with the Borg Warner T10 for I6 and C and A code V8 cars. For higher horsepower, K codes and larger V8s the top loader four speed was used.

If I needed costly repairs to a 3.03 transmission, I would strongly consider swapping to the T5 from a more modern Mustang.

HTH

 

Thanks for the the definitions and information, it is very helpful.

As for my car, it was originally a C code coupe 289. The motor has been changed to a 289 hipo, which would be a K code engine I think, don't know the year of it though. I like the three speed just because to me it is fun to drive. I'm assuming that the transmission and rear end are factory items.

I would feel comfortable doing it myself, but I really don't have the space to drop the transmisson and let the car sit for a while. I will probably go to a mechanic just because they could get it done in a couple days probably.

thanks again

 

It would be interesting to know if the "hipo" in your car is really a K code engine. The K code had 271 hp, a number that is not hard to achieve with modern parts. A real K code engine has solid lifters and a different harmonic balancer, a different carb, and other changes. They are quite valuable to the crowd doing concours (factory correct) restorations. Building a 289 to ~ 300 hp and calling it a hipo is very common, but in my opinion not a correct use of the term hipo.

I agree manuals are more fun than automatics and the more gears the more fun! I have a T5 five speed.

 

Is there any certain way to tell, without dismantling the engine? I've looked at the number behind the starter, but didn't write it down. Probably should have. I've been trying to get in touch with the guy that did all the work but have been unable to find him.

 

You cannot tell from the casting numbers.
Check out
http://www.hipomustang.com/images/hipoeng/

 

This info helped me out a little bit, but ive still got a few questions. I am having the same trouble as above, only I have the C4 auto (it has gears 1,2, 3, and reverse) and its leaking. Ill be driving the car at college with me next semester and Ive decided I need a higher end gear, and preferably a manual. So with that said, im looking into the possibilities of either adding an AOD or swapping in a 4 or 5 speed manual. Does anyone know what all exactly I would have to do to make either of those swaps? My dad has a garage with anything I could need to do the work myself. I called a few transmission places and of course they said "you'll never be able to do that yourself, bring it here and we'll do it. haha. anyway, can anyone give me any info on the parts I would need for either the AOD or manual tranny swap, how much the parts for each would cost, and if possible, anywhere i might get a good deal on it. Thanks a lot for any help in advance as I realize this is a lot of info

Mike
67 Custom Coupe
Nothern Virginia

 

Here is information on the C4 to T5 swap if you want a manual tranny.
http://www.fordmuscle.com/archives/2...swap/index.php

 

Thanks, I appreciate the help, this is definitely going to be a costly and time consuming endeavor, but im sure as hell going to do it right the first time...