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Author Topic:   66 C-4 question
66fstbck
Gearhead

Posts: 116
From: Worhtington, Pa. USA
Registered: Feb 2000

posted 01-10-2002 10:41 AM     Click Here to See the Profile for 66fstbck     Edit/Delete Message   Reply w/Quote
While I'm waiting for my block to get bored, I thought that I might as well get the tranny ready to go. I have 2 66 C4 tranmissions, but both have sat for at least 15 years or more so I figured that each would need rebuilt. I've read everything I can get my hands on and will rebuild this myself. First off, should I look for a newer year C4 to rebuild or even one that doesn't need rebuilt, if so which year to look for ? Are newer C4's direct bolt-in ? Any tips for rebuild kits? This is going behind a rebuilt 289 that should be about 275 - 300 HP. No racing outside the stoplight grandprix every once in a while.
TIA,
Alan

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Alan 66 Fastback

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franklin
Gearhead

Posts: 128
From: VA
Registered: Nov 2000

posted 01-10-2002 11:55 AM     Click Here to See the Profile for franklin     Edit/Delete Message   Reply w/Quote
Make sure the trans you buy/rebuild has the correct shifter shaft in the tranny for your set-up. Floor shift has a different shaft. It can be swapped to make it correct. If you decide to buy a later tranny, make sure you get or buy the correct torque convertor for the year you are using. Around 1970 they changed the small splined shaft sticking out of the tranny, and an earlier convertor won't fit on a later trans. C4's from six cylinder cars will fit, but they supposedly have less clutch packs installed. I've had one in my stock 65 fastback for over 10 years though, and it works fine. But I don't do burnouts everyday either.

[This message has been edited by franklin (edited 01-10-2002).]

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Fastymz
Moderator

Posts: 12015
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 01-10-2002 05:09 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
I'm going for a later C-4 without the green dot as drive.So I can shift from 1st up to 3rd.And I understand that the later c-4 have a 26 spline shaft,and they have more extra clutch packs.I not a trans guy so some of this is greek to me.I was told that the later trans are easyer to find trq,convertors for,

SCOOP

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65 coupe,351w,RPM intake,Carter625,shorty headers,2.5 exhaust, Flowmasters,C4,open 8" 2:80,Big Boss 429 hood scoop,Crager SS,Black Suede.
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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 01-11-2002 12:20 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
YOu can make the drums hold up to 5 clutches. You just have to relocate the retaining grove. A 67 trans will have the better valve body but still be 24 spline input. Best bet is to locate a 70 up V-8 van or truck trans if you can. That way you get the select shift valve body and the HD 26 spline pump. You can transfer your floor shift shaft.

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66fstbck
Gearhead

Posts: 116
From: Worhtington, Pa. USA
Registered: Feb 2000

posted 01-11-2002 11:29 AM     Click Here to See the Profile for 66fstbck     Edit/Delete Message   Reply w/Quote
OK then, I'll look for a newer tranny. What years should I look for 1970 - ? Why a truck or van, heavier built ? And lastly, will it be direct bolt-in ? Sorry abt all the questions but, I wasn't able to find all this info with the search feature and I have no experience with tranmissions.
Thanks again,
Alan

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Alan 66 Fastback

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