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  C6 to C4 tranny change. Whats involved?

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Author Topic:   C6 to C4 tranny change. Whats involved?
70coupe
Gearhead

Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 07-14-2002 12:58 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
I'm thinking of switching from a C6 to a C4 tranny and was wondering whats involved? Is the C4 shorter? Do I need a new drive shaft,U joints,starter,flywheel? Also how well do C4's hold up? My car has run a best of 12.20. Do I need a new shifter? Sorry about all the questions,I would rather know now than in the middle of a swap. My other option is to stick with the C6. I installed a transpak kit last week and now it seems to slip between shifts! I removed the valve body and did exactly what B&M said to do!

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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 07-14-2002 02:16 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
The c4 is shorter, and requires a longer driveshaft, the slip yoke is also different,and it takes a different crossmember. The shifter will work for either trans. The starter should also be the same.

I have always used the same flexplate, but I think there is a difference in them. (and I'm not talking about the 164 tooh and 157 tooth flexplates) I have a 164 tooth flexplate that I have used several times for both transmissions.

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 07-15-2002 12:16 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
A GOOD C-4 will go 400+ runs behind 400 HP with routine maintanance before it needs a freshen up.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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70coupe
Gearhead

Posts: 357
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 07-15-2002 02:39 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by kid vishus:
The c4 is shorter, and requires a longer driveshaft, the slip yoke is also different,and it takes a different crossmember. The shifter will work for either trans. The starter should also be the same.

I have always used the same flexplate, but I think there is a difference in them. (and I'm not talking about the 164 tooh and 157 tooth flexplates) I have a 164 tooth flexplate that I have used several times for both transmissions.


I bought the C4 tranny so I will finally be able to find out how much power I will be able to reclaim. Apparently it was built buy a company called lentech?I will install it in the next few weeks and will let everyone know. Should I buy a brand new driveshaft or do you know of any good donor cars for a 70 mustang?

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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 07-15-2002 02:58 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Almost any 65-73 Mustang with a C-4 or stick will fit, or better yet, some Aerostars have the right length all aluminum shafts that will work.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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