Advance Adapters 50-7502 - Manual (Page 2)

JEEP T18 4-SPD TRANSMISSION TO
JEEP DANA 300 TRANSFER CASE
ADVANCE ADAPTERS INC. P/N: 50-7502
P.O. Box 247, 4320 Aerotech Center Way New Item: (12/98)
Paso Robles, CA 93447 PAGE 2 OF 3
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 03-27-11
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.
WARNER T18 4 SPEED 1966 & UP:
This adapter is designed to fit the Jeep version of the T18 4-speed. The difference between the Jeep and the Ford T18
is the bolt patterns on both the front and back of the 4-speed. The main shafts are identical. The casting in this kit for
the Jeep T18 is the same as we use in the Ford T18, except it is machined differently for your transmission. The Jeep
T18 uses a 6 hole bolt pattern on the back of the transmission. We have attempted to utilize as many of the stock holes
as possible to fasten this adapter casting to your 4-speed. However, the lower two holes are not accessible to use with
our adapter housing. Therefore, some machining is required on your 4-speed transmission in order to use this adapter.
Before you begin to assemble your transmission, you must make sure that you have received the correct main shaft.
The spline on the end of the shaft must have 23 teeth. We manufacture two different T18 main shafts and it is possible
that you could receive the 27 spline in error.
While the main shaft is still in your transmission, set the A/A transfer case adapter onto the back of your transmission.
The adapter should index onto the rear output shaft bearing. This will align the adapter to your transmission. Install
the top two fasteners from the adapter to the T18 to make sure the rotation is correct. The purpose of this is to locate
a position for the new holes that need to be drilled into your Jeep T18. With the casting fastened to the T18, use either
a marking pen or a metal scribe to mark the center of the lower two holes using the casting as a template.
Once the holes are marked, remove the casting and remove the main shaft out of the transmission. Using a drill press
or a mill, drill and tap the two holes marked on your T18 transmission, 3/8"-16 is recommended.
Care should be taken
to keep the inside of the case as clean as possible from chips of metal and dirt. During finial assembly, the
two center bolts to the T18 transmission that are installed through the back of the adapter should have silicone on the
treads to prevent any leakage.
When assembling the gears onto the new main shaft, make sure that all gears have the proper end clearance required
for oiling. Make sure that all transmission assembly work is done by a competent mechanic. Warner gear has used
two different shaft designs for the spacer between second and third gear. Some transmissions will use a snap ring and
thrust washer, while others will use a built in shoulder. Both shafts are interchangeable. Note: Make sure you have
the proper rear output shaft bearing. Some Jeep T18 transmissions used a narrow 308 bearing.
Install the new main shaft and gear assembly into the Jeep T18 case.
The new seal provided with the adapter kit must be installed with the open side towards the transmission. The casting
will need to be installed on the T18. Use a small bead of RTV Blue Silicon on the backside of your transmission. Locate
the adapter onto the back bearing for indexing. Install the top two and new bottom two bolts and tighten. Insert the
two socket head bolts into the middle two holes and tighten.
NOTE: The two socket head bolts will protrude
slightly into the inside of the transmission case. Make sure they don't interfere with the gear. Shorten bolts
if necessary.
The assembled length of the transmission and adapter will vary depending on which installation you are doing. On