Late 60s c-4

I believe this is a 67-68 model it has the 24 spline input shaft and instead of one big spring for the direct clutches it has several like a c-6 .Five direct clutches and  four forward .Is it common to swap the forward clutch drum so you can run a 26 spline input shaft and convertor .I found this in front of an old garage in a small Ga. town (molena ) known for peaches .It has a tci 2200 convertor looks good on the inside .I air checked everything and it worked and it is a case fill .Doug

You are better IMO to start with a later core . It can be done but by time you swap in both drums , stator support input shaft etc , you still have the older valvebody . The later valvebodies are a bit better
Some early ones the output splines are shorter on the front end also

Gregaust wrote:You are better IMO to start with a later core . It can be done but by time you swap in both drums , stator support input shaft etc , you still have the older valvebody .  The later valvebodies are a bit better
Some early ones the output splines are shorter on the front end also

X2

Well I am aware the 70s are much better c-4s are getting hard to find all the drag racers have used them up .I couldn't pass this one up .I haven't determined what to do with it but it sure is light ! Doug

What are you using it for?

dfree383 wrote:What are you using it for?

That's a very good question

If it wasn't so expensive and if I didn't have so much in my c-6 I would put it into my drag car .To build this c-4 for my 460 would cost me a ton of money .It would be a quick two tenths or more but if I had to install all these aftermarket bell housings and internal pieces it would cost a lot for a couple of tenths . Also someone might want this c-4 for their small block car .I couldn't go wrong for what I paid .While you are asking can you modify the clutch drums for more clutches like a c-6 ? and do you need those six pinion planeteries ? Thank fellows Doug

Regular/Typical C4's are not the ticket for Big Block, need too much $$$ in them and they just don't last IMO, if your going to change do a glide or a TH400 if not just stick with the C6 they are durable and inexpensive.

I know this Dave I love my c-6 but it is heavy the thing is I don't need to lift it often it doesnt give much trouble.Most of my fellow racers are sbf guys their c-4s need a freshen up every two years .When I installed Franks trans brake in my c-6 it hadn't been apart for five years and it looked like new inside .I went on performance automatics website .They have some nice stuff for the c-4 it is just to pricey for me .I guess I am just dreaming of something lighter .I think I will pick up some lite beer maybe that will satisfy me Doug

I have 2 Super Stock customers using Dynamic C-4's behind 460's (right at 700HP) with very good results. 2 years between freshen ups.

I have run a 24 spline case fill C4 in my low 11-high ten second Shelby for 44 years and NEVER broken an input shaft OR spun a hub ( like the 26 spline is famous for) I have used them behind 550 tq , and shifted over 9,000 with them. Modern clutch material an Kevlar bands are a huge improvement.

Thanks for your reply GT.I would love to try this c4 out but for now it is just something else for me to step over in my shop .My c-6 is fine but in my heavy 67 comet a c-4 would be a major weight loss .I see you on Jays forum also I love those old FEs too .Doug