c4 it is im going to a super ford swap meet in columbus ohio thankgiving week end so i will look for one then thanks for the help. john
there will likely be a few board members at the swap meet as well. We go every year. I will/was gonna make a post about it in a week or so. I plan on going Saturday. We usually meet for breakfast then go to the swap. Maybe you can/would join us.
I will be at the swap meet as well. I can bring you a c4 tranny if you want. Email me directly (see below) if I can help.
C6 is bigger and takes more HP to turn over. C4s can be built to take up to 800 HP if done right. Very little reason to go to a C6 in a light car anymore.
C4 = 64 and C6 = 66, so 2 years apart. The C4 was designed for low power and/or lightweight vehicles. The C6 was for heavy cars, big engines, towing, and trucks. The C6 is a very strong tranny just as is. While the C4 is a pretty weak tranny in stock form. Used to be that folks would swap to the C6 to get strength, and just kinda deal with the weight and size. Over the years though, the aftermarket has developed parts for the C4 to give it tremendous strength. So, before the aftermarket stepped in, the C6 was the answer when you needed a strong tranny. If the C6 didn't soak up so very much horsepower and wasn't so heavy, the C4 probably would never have received attention from the aftermarket.
The C4, in stock form was used behind engines as small as 1600 CC 4 cylinders and as large as four barrel 351 Winsor engines in 69 mustangs. In stock condition it can handle 350 Ft. Lbs. of torque. The only aftermarket parts that I use are in engines producing 600 HP and up. I do modify the number of clutches, lubrication, cooling and valve body circuits for up to 500 HP but no "after-market" parts are needed until you need an input shaft that will take more than 600 HP. The factory hardened shaft will easily handle 500 Hp. There are lots of myths about the C4 but the simple truth is that any C4 from 1971 on that has the 5 clutch plates in the forward clutch and 4 clutches in the direct clutch can be used as is with a shift kit and some minor mods with engines that produce up to 400 - 450 HP and torque - even with the "soft" input shaft. The C4 is a great small transmission that can handle the bulk of the small block street performance cars that were built in the 70s and 80s.
Paul, I saw a c-4 behind a 390 in a stock LTD or Galaxie in the wrecking yard once, stock bell housing and all. And no is was not the FMX it was a c-4, I almost bought it because I had never seen one before and I used to be into FE motors, but I had long since moved on to SB's by this time.
