Editing Ford C4 transmissions

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=Rebuild and re-assemble of a Ford C-4 transmission=



===Basic rebuild information===
This WIKI is not intended to be a replacement for an ATSG  tech manual. First time builders will likely need a tech manual.

This is not a step-by step pictorial, don't assume it is shown where every part goes.

This article is a work in progress.



=Main case prep work=

Rear side of main case. This photo shows the placement of the parking pawl , pin and spring for the pawl.

Notice the fresh bushing installed in the case. Good idea to replace the bushing.  While the bushing is out, check the oil return hole from the cooler system for size or restrictions. Often builders drill the oil return hole larger about 30% than the OEM hole. About .200 or .210 drill bit size works well

 
[[file:Medium_0180.jpg]]

=Parking pawl wheel and thrust washer=

Thrust washer for parking pawl wheel shown in photo

[[file:C-4_build_-_02.jpg]]


Parking pawl wheel with thrust washer installed.  Washer held in place with assembly grease


[[file:C-4_build_-_04.jpg]]

Here the governor support with oil transfer tubes installed.

[[file:C-4_build_-_05.jpg]]

=Main case roller clutch, rear band & drum install=


This view shows the rear band installed with the apply struts set in place

[[file:C-4_build_-_08.jpg]]

This view shows the rear roller clutch and race installed. That is the rollers with accordion style springs that push the rollers towards the race. You set the race in place first. Set the rollers in place next and install the springs last. Watch the spring install as sometimes they like to turn sideways at one end


[[file:C-4_build_-_09.jpg]]

Snap ring installed on the out put shaft. Snap ring sets on top of the rear ring gear before the rear planet is installed.This retains the shaft into the transmission. If the snap ring will not go into the groove, recheck the parts installation to resolve the clearance problem.

[[file:C-4_build_-_14.jpg]]



Thrust washer installed on rear planetary unit, a little assembly grease can hold it in place.

[[file:C-4_build_-_15.jpg]]

In this photo the rear part of the gear train is installed. This includes the band with apply struts, the rear planet and ring gear (under the planet).

[[file:C-4_build_-_24.jpg]]

=Assemble drums , thrust washers and planetary gear= 

Photo below shows the near complete stack up of forward drum , direct drum, planetary and the drive shell sets to the left.

[[file:C-4_build_-_17.jpg]]


Photo below Shows front planetary with matching ring gear.  Ring gear has fresh busing installed

[[File:C-4_build_-_18.jpg|none|frame |Front planet with ring gear]]




Inside the forward drum, shows location of thrust washer

[[file:C-4_build_-_19.jpg]]



=Vacuum modulator=


Photo of typical C4 modulator valve , pin and vacuum modulator. Factory length on modulator pin is 1.620, that may vary .010 or .015 . A longer pin (.030 - .045)will firm up shifts and the shift will be slightly later. A shorter pin does the opposite.

Some modulators are "thread in" design (early trans, pre- 1970) Push in design shown in photo.

The ''pin'' must be there for proper operation of the modulator


[[file:C4_modulator_valve.jpg]]



[[Category:Transmission]]

[[Category:Good articles]]