What is the going rate to rebuild a c-4? It only has 37k original miles but has been sitting for years. I'm sure the seals are bad. I was quoted $1000 if they pull it or $800 if I take it in--sounds kinda high..
Sounds ridiculous,if you decide to build it your self,you can buy lacquer thinner (cleans great)
and you should blow dry the parts. Clean the case, bell housing, extension housing,pan at a car wash
And be sure to go thru the valve body. Take a rag and make rolls for the valve train so you don't get confused. Throw away the flat hockey puck (if it has one),makes for a better 1-2 shift & 3-2. C4's are not too hard on bushing's.
They are really easy to build if you go by the book and make sure the input shaft
"TURNS" with the parking pawl engaged after building. You want to check the end play of the transmission as well as the torque convertor before the build.. The hardest thing you would encounter would be the high/reverse clutch assembly if it has a single coil spring. Maybe a transmission man would help you with that.
Use STP or equivalent for easy assembly of the clutch drums and servo's. Match your gaskets.
If you can,pick up a pictorial book,like a ford manual or equivalent.
Be sure to use a new vacuum modulator/hose.
Use dextron,it has a higher coefficient of friction and with stands higher temperatures
than type F.
Forgot to add check the bushings clearance,like the extension housing's do wear.
If you do install bushings,make sure you remove any nicks in the bore,and the bushing
seats squarely.