Clutch size question

[AMXguy]

I called centerforce to get a part # for a dual friction set up and they said I could have several different ones. are they right? I have a '70 Challenger 383 magnum 4 spd  matching #'s so nothing's been changed out. I'd like to have the clutch here before I start so I don't have to quit in the middle of the project to order parts.  is there a sure answer or should I do as they say?

[Chryco Psycho]

if you have the alum belhousing [which you should ] you need a 10.95" clutch & have a 130 tooth flywheel
if you have a iron bel you need a 11" clutch & will have the 143 tooth flywheel
 personally I would use anything over the CF overpriced junk though , I use McLeod

[AMXguy]

They said there were two different spline choices, or does the 10.95" take care of that? I'm just going off past use on AMC but the Center Force was everyones top choice, Mcleod srewed up our Z bars and took both legs to push.

[AMXguy]

 You got me thinking so I went and checked, my bell housing is steel so it's been changed I guess? the tranny #'s match so it's original but maybe the flywheel isn't, it's amazing what's gone on with these cars over the years.

[kgbodyshop]

In my Hemi Challenger, I run a 11'' clutch and pressure plate on a 10.5 flywheel. The pressure plate is made to allow the big disk. You have to run special bolts. It works very well. For both I only paid $150.00 & I agree the CF is over priced junk. If the trany is original it should be a 23 spline, Mopar stopped making the 18 spline in 1969.

[Chryco Psycho]

you need to be sure of the spline count , the 23 splins is 1" in diameter , the 18 is 1 3/16 & is a much coarser spline
 BTW my 70 had an 18 spline from the factory probably 71 was the last year for the 18 but a 383 should not have a 18 spline

[AMXguy]

I have the steel bell housing so is it psible to have the 10.4" clutch or does it have to be the 11' ? and would it be the 18 spline or is it possible to have a 11" with a 23 spline? I'm going to tear it down in the next day or two but I need to know if someone morgified it or if I can just order a kit and have all the right peices.

[Chryco Psycho]

you can have 11" or 10.95 with either 18 or 23 spline
you could just mark one tooth & count all the way around to see if ti is 130 or 143

[Killer_Mopar]

I have to agree with the people that said not to run a centerforce. I have a cf dual friction behind my 383 and dont care that much for it. The clutch grips like hell but I simply do not like the feel of the pressure plate. I have the diaphragm type pressure plate and it is easy to push and hold in but it is really hard to let out smoothly. If I had to do it again I would definitetly buy a 3-arm type pressure plate....

[Stacked440]

I have a 23 spline but I believe it isn't 1 inch?  It ended up being something like 1 3/16 or something like that, Ill re-measure but anyone have any ideas about this?

[AMXguy]

 For future reference for anyone needing a clutch a my '70 383 R/T turned out to be: steel bellhousing, 143 tooth flywheel, 11' clutch 23 spline one inch input, the same set up as a '69 Road Runner and a some other Mopars. from what I found ouit this is fairly common on the HP motors but for some reason the books don't list it.

 I beleive all 23 spline inputs are 1"?  if not throw another variable in there.

[Chryco Psycho]

23 spline are 1" , 18 are 1 3/16

[moper]

I have to agree with the people that said not to run a centerforce. I have a cf dual friction behind my 383 and dont care that much for it. The clutch grips like hell but I simply do not like the feel of the pressure plate. I have the diaphragm type pressure plate and it is easy to push and hold in but it is really hard to let out smoothly. If I had to do it again I would definitetly buy a 3-arm type pressure plate....

Killer, did you remove the huge overcenter spring under the dash? If not..That's why it feels "funny". The spring is not used wiht a diaphram type clutch plate. I drove my Cuda for 2 years before I really figured out why it felt like it did. Took out the spring, and Voila! no more issue.

[Killer_Mopar]

Killer, did you remove the huge overcenter spring under the dash? If not..That's why it feels "funny". The spring is not used wiht a diaphram type clutch plate. I drove my Cuda for 2 years before I really figured out why it felt like it did. Took out the spring, and Voila! no more issue.

No..... Never said it in the instructions, which I went through with a fine tooth comb. Weird, I read what you wrote, laughed, got angry, and became extremely curious to see if it fixes the feel. If it does I will have nothing bad to say about CF other then the price and the fact that they dont say to remove the spring. My car is in storage with parts off it, but Im going to try to make it over there to see if it that spring is the problem. Thanks a ton

[Chryco Psycho]

Good Luck & be CAREFUL removing the OC spring