Advance Adapters 50-2904 - Manual (Page 2)

FORD C4 3 SPEED AUTOMATIC TO
JEEP DANA 18/20 TRANSFER CASES
ADVANCE ADAPTERS INC. P/N: 50-2904
P.O. Box 247, 4320 Aerotech Center Way Old Part No:
Paso Robles, CA 93447 PAGE 2 OF 3
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 06-11-14
SPECIAL NOTE: The components packaged in this kit have been assembled and machined for specific type of conversions. Modifications to any of the components will
void any possible warranty or return privileges. If you do not fully understand modifications or changes that will be required to complete your conversion, we strongly recommend
that you contact our sales department for more information. This instruction sheet is only to be used for the assembly of Advance Adapter components. We recommend that a
service manual pertaining to your vehicle be obtained for specific torque values, wiring diagrams and other related equipment. These manuals are normally available at automotive
dealerships and parts stores.
FORD C4 AUTOMATIC TRANSMISSIONS:
The Ford C4 automatic transmission has a case length of 11-3/16", 11 bolts for holding the oil pan in position and has a
removable front bellhousing. The bellhousing is available for 289, 302, 351C and 351W Ford engines. There is two
different main case options that are referred to as either a flared case or a step case. The step case has the oil dipstick
entering the transmission case, while the flared case has the dipstick entering the transmission pan. Both models are
acceptable for use with all the Advance Adapter kits. The V8 bellhousing length is 5-7/8" and can be interchanged with
the 2.8 V6 bellhousing on Bronco II and Ranger conversions. On transmissions 1970 and earlier, the pump shaft was
slightly longer and will require shortening for use with our new output shafts. The transmission should be assembled by
a competent mechanic to make sure the transmission operates correctly. The new shaft should be identical to the original
shaft with the only exception being the new splined area for use with the transfer case adapter.
Most C4 transmissions have a breather in the main case of the transmission. There are a few applications where the breather
is installed into the tailhousing. We have included with your kit a new breather for installation into your new adapter housing
only on transmissions that require vented tailhousings. The installation procedure is to simply drill an 11/32" hole in the
top portion of the new tailhousing and press the new vent plug into position. If this is not done on transmissions equipped
with vented tailhousings, then you will have extreme pressure and leakage out the transmission dip stick.
When installing the new tailhousing on the back of your transmission, it may be necessary to trial fit the adapter in position
and make sure that the linkage has all the proper clearance on the internal cavity of the adapter. The bolting of the tailhousing
to the main transmission may need a slight amount of grinding for proper head clearance due to the aluminum sand casting
tolerances.
All installations will require the use of a transmission cooler The cooler can be either installed in the radiator or a remote
location is acceptable. The transmission shift control can either be a Hurst floor mounted type shifter or sometimes the
existing column shift can be modified on certain applications.
The new seal provided must be installed with the open side towards the C4 transmission.
C4 vacuum modulators may require some clearance of the lower passenger side on the adapter housing, depending on the
vacuum modulator height. Once the modulator is installed into the main case, the retainer clip may not seat tightly against
the modulator. The clip can be modified or the casing can be modified to fit the clip correctly.