* Also another thing im NOT going to put things on here such as internals or different color dipsticks ect as i dont want to mislead people because they might have a rebuilt or repainted gearbox
c3: * c3 autos are the 3 speeds that were used in the escorts, and 4cyl cortinas
* It has an Aluminum case And a separate bell housing
* (need to find a pic, anyone got one?! ?!)
2.47:1 1st gear
1.47:1 2nd gear
1.00:1 3rd gear
* It was In Cars Between 1974 and 1987
* Above is a picture of a c4. Or "The Case Fill C4"
* #1 notice where the dipstick hole is its on the BODY of the transmission.
* #2 notice how after the bellhousing joins to the main body there is a steep drop.
* c4's use the 10.5" 157 Tooth Flexplate.
* Bell housing is retained by 7 x 9/16” headed bolts that also retain the pump assembly.
* c4s were orignally 6 cylinder gearbox's
* Above is a c10. Or 'The Pan Fill C4'
* #1notice that there isnt a hole in the body where the dipstick goes?
* #2 notice the differences between the c4 where the bellhousing meets the body?
* The dipstick BOLTS into the Pan (not Push in like the c4)
* c10's use the 11 7/16" 164 Tooth Flexplate.
* Input Shaft has 26 splines. The diameter is .839”.
* The Bell housing bolts to the case via 5 x 5/8” headed bolts.
* c10's were orignally the 302 gearbox's (the 351s had fmx's) and some 351M/400M US Trucks
* a c6 like in the picture above has the bellhousing CAST onto the main body (you cant unbolt it at all).
* c6's use the 11 7/16" 164 Tooth Flexplate.
* They also have 31 Spline output shafts.
* c6 is the strongest of the 'c series' transmissions. also rare as they were only made in America, they originally came out on 'FE', '335' and '385' series V8's.
* It is essentially an updated C4 with some external changes and major internal changes
* The c9 has the SAME bellhousing as c4
* the Input shaft of the c9 is the SAME as a c10, Which is 26 Splines. The diameter is .839
* Refer to C4 for identifying a c9 externally
* The C5 is an updated version of the C10 released around 1982.
* It is an upgrade that sought to rectify some problems- namely lubrication.
* There Is an E2 casting code on The case
* There is a Fine thread adjuster on front Band (need a pic of this if someone can help)
* Another way to tell from a c10 is Larger 1/4 " threaded cooler fittings
* There are 2 Different Sized Flex Plates, the 10.5" and the 11-7/16"
* The 10.5" Flexplates can usually be found on Windsors (older Ones from Xr's ect) and 6 cylinder's they are a C4/c9 Flexplate. They Have 157 Teeth
* The 11-7/16" Flexplate can be found behind 302c/351C And Bigblocks. They are a for the C6/C10. They Have 164 Teeth.
* BOTH C4/C9 and C10/C6 Can Be found behind Clevelands, i recently swapped a c4 for a c10 behind my 351.
* Also not there is only 1 type of Starter Motor for both sized flexplates!
* You can swap C4 & C9 around.
* You can even fit a C4 &C9 to the C10.However the C10 doesn’t fit anything else.
* Note The Bell housing will dictate what Torque Converter you use. The Torque Converter heights are different between C4-9 and the C10.
* This is the vacuum modulator that controls upshift firmness and timing.
* Adjusting the modulator clockwise firms and delays the upshift, while counterclockwise speeds up and softens the upshifts.
* Make your adjustments one turn at a time, then take a spin to evaluate the upshifts.
* Do not adjust the vacuum modulator any more than four turns in either direction.
* C4s came with two types of vacuum modulators. Early versions had a screw-in type; later models have a push-in modulator with a clamp as shown.
* Weak intake-manifold vacuum caused by a hot cam or torn vacuum hose will adversely affect upshifts.
please note, c4 and c10's have DIFFERENT SANDWICH PLATES and DIFFERENT FLEX PLATES and DIFFERENT BELLHOUSINGS and DIFFERENT TORQUE CONVTERS (due to the c10 having a
different INPUT SHAFT)
please also note, they all use the SAME tail shafts, and same SHIFTERS, also same INHIBITOR switch and CROSS MEMBER and SPEEDO GEARS, (but not c6's they have 31 spline output shafts)
Edited by tucker, 08 August 2009 - 06:33 PM.