Monster C4 Thread Text - Edited (Way Long) Version2

this needs to go to the top again, wish it was a sticky at the top

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i am being told by someone that in the early (64-69 .788 dia) input shafts there are both 24 & 26 drum spline inputs. this expert thread says only a 24 drum spline shaft in the early.

who is correct?
thanx for any input.
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wish it was a sticky at the top

look in C4 info

ok, i got it made a sticky. the monster thread, i mean.

i checked C4 info thread. didnt see anything in there about input shaft descriptions. am i in wrong thread?
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Thanks for gettting it made a sticky. 'Bout time.[img]/forums/images/smiles/icon_frown.gif[/img]

Section 4 of the Monster thread. '69 and earliers have the 24 while the '70 and later have the 26. To wit...

4 - Input shafts
Early transmissions used a 24-spline input shaft that is smaller and weaker than the 26. The early 24 spline input shafts have a diameter of .788" and the 26 spline shafts are .839". The 24 spline shaft trannies can be upgraded to a 26 by swapping the stator support and the hi/reverse and the forward drum. There's a how to at http://www.mustangcentral.net/tech/c4conversion.html GA - It is said that the factory 26 spline input shaft will take up to 600 hp. TR - Use of an after market hardened input shaft is only needed for the very high powered cars and heavy trucks. Up to 450 HP is fine for the stock one, above that it would be good insurance. 89C - Very few factory C-4 input shafts are hardened and seems that only the original C-4s that had the "R" servos had them (all mine came from trucks with yoke that bolts on tail shaft and 4WD C-4s with transfer cases bolted on where tail shaft goes.) If you can scratch the input shaft, then it isn't hardened. I have tweaked the splines and shafts of the non hardend inputs but not the hardened ones. (Once I found out they do exist from the factory.)

sorry, i meant to say i didnt see anything in there about my specific question on the old input shafts. yes, i saw what you are pointing out.

i am asking if anyone else knows of this supposed early shaft. thanx.
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There are 3 input shafts/
Early up to 69 were .788" diameter and 24/24
70 only .839" and 26/26.This is a unique forward drum to suit this input shaft.
All after 70 were .839" and 26 at converter and 24 in forward drum..All aftermarket input shafts are based on this one.

C5 are the same though the c5 ones i've got have a bit of a recess along the shaft length

I just found this thread! it has a wealth of information in it! even more than I have in my personal archives.
I do wish the information about aditional clutches was a bit more detailed and maybe listed numbers... its ok as it is but all jumbled.
We should probably add some information about governor modifications and modulators and pins. It might be good to mention that before 1967 the pumps had O-rings and gaskets. The one big item that I couldn't find as I looked through it all, and I might have missed it, was standard adjustments. You know; WOT, Kickdown, Shift linkage and bands. Also installation tips like lubing convertor seals to prevent them from burning up before they get oil and putting oil in the tranny and converter before start-up.
All said and done it is a great source of info - Gregaust, why didn't you tell me that this was here?

<font size=-1>[ This Message was edited by: PaulS1950 on 9/28/06 5:03pm ]</font>

Hey Paul:
Thanks for your feedback. You are right on every count. That additional information is needed and would be a great addition. The clutch section is jumbled and does need part numbers and some more specifics.
Feel free to email me with your written and rewritten passages and I will gladly insert them.
Cheers!
Paul (R Code)