C6 trans cases: are they the same?
Senior User
Joined: Feb 2000
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C6 trans cases: are they the same?
I have a C6 transmission that came out of a '70 model car with a 351w. The case is cracking along the top ribbs. I have connections with a guy that has a C6 from an '83 F250 with the 351w also. Do these 2 different model C6's have the same case so I can swap the guts from my C6 over to the '83 C6 case?
Thanks
Thanks
Senior User
Joined: Jul 1999
Posts: 472
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From: USA
C6 trans cases: are they the same?
Beware of poor alignment at the pump-to-case oil ports. I had to re-rebuild one in an '86F250 after a production rebuilder (Jasper) mixed & matched different year parts. Result was a blown pump gasket & O-ring causing a stream of ATF out of the bellhousing while plowing snow...
Art
Art
5th Wheeling
Joined: Dec 2001
Posts: 47
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From: Gadsden
C6 trans cases: are they the same?
There is one minor internal difference between early and late C-6's.
The detent spring system is different. Not sure what year it was changed, but it was early 80's. The detent spring is the spring pressure you feel when you move the gearshift and it moves the shift lever on the side on the trans.
Early models have a coil dentent spring that is mounted on the valve body. Later models have a leaf spring/roller design. The case for the leaf spring type has a boss cast in the case for the bolt to hold the spring. Early model cases do not have this cast in boss and late model valve bodies do not have the place for a coil spring.
You can use an early model valve body and detent spring in a late case becasue it carries it's own spring. You can't use a late valve body in an early case because there is no palce to bolt the spring.
Later,
David Cole
The detent spring system is different. Not sure what year it was changed, but it was early 80's. The detent spring is the spring pressure you feel when you move the gearshift and it moves the shift lever on the side on the trans.
Early models have a coil dentent spring that is mounted on the valve body. Later models have a leaf spring/roller design. The case for the leaf spring type has a boss cast in the case for the bolt to hold the spring. Early model cases do not have this cast in boss and late model valve bodies do not have the place for a coil spring.
You can use an early model valve body and detent spring in a late case becasue it carries it's own spring. You can't use a late valve body in an early case because there is no palce to bolt the spring.
Later,
David Cole
2nd Gear
Joined: Dec 2022
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From: Pasadena, CA
(C6 FE block dimensions) vs (C6 351W dimensions)
Greetings ,
In my 71 f250 , We are shortening frame 16" , and we are transplanting a 351W /stroked 408.
Question 1 ) What would be the public opinion here swapping in a "AOD" {NOT {{E}} that would be rebuilt updated etc. I don't want to step intp a electronic trans and have to deal with adapter plates nor stand alone TCU after. Truck gearing is 3:53, and will be running a 32-33 inch tire.
I'm going to be stuck with a small fuel tank, and do NOT want to be stopping at gas pump every 200 miles so I really feel I need to think of over drive trans..
Item 2) More than likely I'll be faced with length issues of first drive shaft (between trans and carrier ) , and obviously 2nd driveshaft since we are shortening frame . Question ?? Is this a point where I can get away with a new single driveshaft?
Thank you
In my 71 f250 , We are shortening frame 16" , and we are transplanting a 351W /stroked 408.
Question 1 ) What would be the public opinion here swapping in a "AOD" {NOT {{E}} that would be rebuilt updated etc. I don't want to step intp a electronic trans and have to deal with adapter plates nor stand alone TCU after. Truck gearing is 3:53, and will be running a 32-33 inch tire.
I'm going to be stuck with a small fuel tank, and do NOT want to be stopping at gas pump every 200 miles so I really feel I need to think of over drive trans..
Item 2) More than likely I'll be faced with length issues of first drive shaft (between trans and carrier ) , and obviously 2nd driveshaft since we are shortening frame . Question ?? Is this a point where I can get away with a new single driveshaft?
Thank you
Logistics Pro
Joined: May 2015
Posts: 4,468
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From: Tri Cities, TN
Young man you have replied in a 22-year-old thread. You need to start a new thread you will get more replies.
You can use an AOD read this first. HOW TO: Changing Carburetors and Making it Work with an AOD - Ford Truck Enthusiasts Forums (ford-trucks.com)
You can use a one-piece driveshaft consult with the driveshaft shop first the longer they get the bigger diameter they have to be.
You can use an AOD read this first. HOW TO: Changing Carburetors and Making it Work with an AOD - Ford Truck Enthusiasts Forums (ford-trucks.com)
You can use a one-piece driveshaft consult with the driveshaft shop first the longer they get the bigger diameter they have to be.
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