C4 restoration

[68xstang]

Hi,

I have some spare time while my mustang is in for a paint job, which I could use to go through my C4 transmission. The car is 42 years old (a -68 coupe), and as far as I know the transmission has never been touched.

Therefore I think it's time to have a look at it. There is nothing wrong with the transmission, it works as it should, but considering that I will boost the engine HP, I should also "strengthen" the transmission.

What would be the things to do and change/upgrade? Are there complete overhaul/performance kits available for use? Other comments?

 

[mudbilly]

put in a shift kit and a good stall converter...........i don't know any real technical details, since i had it done by a transmission shop....

but it really made a big difference in how the cars shifts

 

[Wicked65]

The are a couple things to do to make a C4 better. A good Valve Body/ Transgo shift kit, Deep Pan with deep Filter to increase fluid, A good Stall converter per your application, and a good Transmission cooler. As far as internally, if you just do a good solid rebuild, using good parts from broaderperformance, hughes transmision, Performance Automatic, should make that trans last another 42 years. Badshoeproductions.com is a great source for a video on C4 rebiulding. Thats what i used for mine.

 

[68xstang]

put in a shift kit and a good stall converter...........i don't know any real technical details, since i had it done by a transmission shop....
but it really made a big difference in how the cars shifts

Please explain the big difference.

The are a couple things to do to make a C4 better. A good Valve Body/ Transgo shift kit, Deep Pan with deep Filter to increase fluid, A good Stall converter per your application, and a good Transmission cooler. As far as internally, if you just do a good solid rebuild, using good parts from broaderperformance, hughes transmision, Performance Automatic, should make that trans last another 42 years. Badshoeproductions.com is a great source for a video on C4 rebiulding. Thats what i used for mine.

The cooler and deep pan are on my list already. The internals are what I am thinking about. E.g. what does the 47-2 reprogramming kit from TransGo include and what does it do?
How is the stall converter selected (what criteria)?

 

[68xstang]

Badshoeproductions.com is a great source for a video on C4 rebiulding. Thats what i used for mine.

I cannot order this, since I live outside USA. Is there another place where I can get it?

 

[palerider94]

Stall converter is based on cam and rear end gears. Transgo kit is has new springs for valve body and gaskets you need. Gives a little firmer shifts and allow you to manually shift thru the gears without delay. Even though not necessary a ratchet shifter to go a long with it is very sweet. call TCI and give them specs of car and they can tell what size stall to use. Also I would consider upgrading to a new trans 70+. You can get one thru TCI or others for about grand. If you will be running over 350+ HP your current trans internals will need to be upgraded. By the time you by the kit - pay for someone to rebuild cost close to the same. Plus the 70+ have stronger/larger input shafts and are more stout.

 

[mudbilly]

Quote:
Originally Posted by mudbilly
put in a shift kit and a good stall converter...........i don't know any real technical details, since i had it done by a transmission shop....
but it really made a big difference in how the cars shifts

Please explain the big difference.

if i just drive normally, you can't tell anything except it has a little bump when it shifts...( i took this dude for a ride and he thought that i needed new universal joints...)............in fact i am usually in third gear before i know it...

.......but if i put my foot into it from a dead stop, it doesn't shift until it is revved pretty high and it'll chirp the wheels when hitting second, i have never kept my foot into it long enough (yet) to see how it handles going into third....

i have just begun experimenting with shifting it thru the gears manually.....

i know the builder had some concerns about the vacuum, because of my cam, like others mentioned, i think he did something with the regulator, or whatever that device is that linked from the intake to the tranny....

mine aleady had the cooler built into the radiator....

 

[68xstang]

I will go with the kit 47-2. Thanx for the posts everyone!