Advance Adapters 50-2000 - Manual (Page 2)

FORD T & C 4 SPEED TO
JEEP & SCOUT DANA 18/20
ADVANCE ADAPTERS INC. P/N: 50-2000
P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711020
Paso Robles, CA 93447 PAGE 2 OF 2
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 07-02-99
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 T & C TOP LOADER 4 SPEED (RUG):
This kit is designed for the Ford T&C or "Top Loader" 4 speed for installation into Jeep & Scout Dana 20 transfer cases,
1945-79. The overall length of the new transmission will probably require driveshaft modifications.
Gear Ratios:
First Second Third Fourth
2:32 1:69 1:30 1:00
2:78 1:92 1:35 1:00
The Ford Top Loader transmission that is compatible with the Advance Adapter kits must have a case length of 1-1/4"
and the material must be cast iron. The casting part numbers could be C8AR-7006D or D2AR-7006CB. The gear shift
linkage is on the left side of the case and the inspection cover that is mounted on the top must be held down with ten (10)
bolts. This transmission is sometime referred to as "RUG" or "RAT". The RAN transmission which is an aluminum case
that is only 9-3/16" long is not compatible with this Advance Adapter kit. The RAN can usually be identified by the shifter
that is in the top of the tailhousing.
A new main shaft is supplied with this kit for use with your new 4 speed transmission. Complete disassembly of the
transmission must be performed and if unfamiliar with this transmission, a competent mechanic should perform this
operation.
When assembling the Advance Adapters new main shaft with the original gears, make sure that all of the gears have
sufficient end play for proper lubrication. This should be done while assembling the gears and after assembly to the transfer
case. If the shaft that you have received with the kit does not compare to your original shaft, it is very possible that you
have received or purchased the wrong adapter kit.
This transmission has two shift rails that extend out the rear side of the case. It is best to shift all four gears on the work
bench prior to assembly into the vehicle to make sure the proper depth and clearance has been maintained. If you cannot
fully engage each gear, then the rod may be bottoming out inside the adapter plate.
Once the new main shaft has been installed and the adapter housing has been assembled with the appropriate gasket in
place, you must then slide the special bushing (716033) into position as illustrated. This special bushing must be used
between the two bearings in order to prevent any pre-loading.
Make sure that you install the correct bearing retainer and rear bearing in the back of the new Advance Adapter plate.
P/N 723750 sealed washer is for use under the bolt head that bolts the transfer case to the transmission from the
transmission side. By using this special sealed washer you will be able to prevent any oil seepage from the transfer case.
The transmission will need to be controlled using a Hurst type shifting tower. Advance Adapter Bracket No. 715506 will
mount the tower and Rod Kit No. 715631, will supply the necessary rods, levers and hardware.