Same old question again
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New User
Joined: Aug 2010
Posts: 7
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Same old question again
Hey Guys , sorry to repeat the same topic I'm sure you've heard
many times but I need advice. Have a 1968 F-100 with a very
tired 240 straight 6 and a c-4 transmission, it's a long bed so
it has the 2 piece drive shaft. I want to make it a daily driver
that is comfortable and can handle highway speeds better
than it does now, what's the best way to proceed? Rebuild
what I have now, swap the engine and or transmission? What
is the easiest switch to do? I have a chance at a nice 302 and a c-6
but will it bolt up? I'm open to a standard as well, How much trouble
am I in for? Thanks for any advice. Ron
many times but I need advice. Have a 1968 F-100 with a very
tired 240 straight 6 and a c-4 transmission, it's a long bed so
it has the 2 piece drive shaft. I want to make it a daily driver
that is comfortable and can handle highway speeds better
than it does now, what's the best way to proceed? Rebuild
what I have now, swap the engine and or transmission? What
is the easiest switch to do? I have a chance at a nice 302 and a c-6
but will it bolt up? I'm open to a standard as well, How much trouble
am I in for? Thanks for any advice. Ron
Senior User
Joined: Nov 2000
Posts: 379
Likes: 2
From: Azle, TX
Drop in a 300 from a newer truck 
I pulled my 240 and dropped in a 302. They both have the same bellhousing bolt pattern, so either tranny will work. The C6 might be longer, so you might would have to get the driveshaft cut to work. Also, to drop in a SBF, you need the engine perches that bolt to the crossmember. Things to think about, you will need to either get a different radiator, cause the inlet side of the radiator is on the other side. You will have to fab up some throttle linkage, and exhaust. Let me know if you need more information or pics.
I pulled my 240 and dropped in a 302. They both have the same bellhousing bolt pattern, so either tranny will work. The C6 might be longer, so you might would have to get the driveshaft cut to work. Also, to drop in a SBF, you need the engine perches that bolt to the crossmember. Things to think about, you will need to either get a different radiator, cause the inlet side of the radiator is on the other side. You will have to fab up some throttle linkage, and exhaust. Let me know if you need more information or pics.
Elder User
Joined: Jan 2002
Posts: 780
Likes: 0
Each to his own
I would rebuild the 240 as a 300 (change crankshaft) and rebuild the c4. There are several versions of the C6. If it bolts up to the 302, it will bolt up to the 240/300. You will find that the 240/300 will have more low end torque than the 302 and will get better gas mileage. The C6 is a very strong transmission, but it takes a lot more hp to operate it than the C4. The pickup truck version of the C4 has more clutches and is stronger than the car version and should work fine behind the 240/300 or the 302.
