RTS 4 SPEED TO
JEEP DANA 18/20
ADVANCE ADAPTERS INC. P/N: 50-5401
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: 11-14-13
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 TOP LOADER OVERDRIVES 1977 & UP:
This kit is designed for the Ford truck RTS TopLoad transmission. It was found in Ford Trucks, Broncos, and
Econoline Vans 1983-1988. This version of the transmission had an aluminum case, aluminum shift tower, and a top
shift control cane shifter. These transmissions were more commonly referred to as “RTS”. The “RTS” is largely
considered the “Truck” version of the “T&C- O.D.” The transmission would also bolster a larger rear bearing than the
car version. This transmission commonly was stamped with a casting #2605275. The transmission was manufactured
in Mexico by the Tremec Corp under the name “T-170”. The “RTS” was the first predecessor of the successful T-
170 series of the transmission that would include the popular Jeep T176.
On Jeep conversions, the new main shaft position is determined by the fixed gear in the transfer case. If the transfer case
gear is not installed properly with the correct bearing, then the position of the new main shaft in your transmission will
be incorrect. The clearance holes in the adapter plate must provide adequate depth for the shift rail to fully extend into
the housing. It is best to shift all three gears on the work bench prior to assembly into the vehicle in order to make sure
the proper depth and clearance have been maintained.
In each kit, we have included a special seal washer (Part No. 723750) that must be used with the one (1) bolt that screws
into the transfer case. This seal will prevent any transfer case fluid from creeping up the threaded hole area.
