Advance Adapters 50-7401 - Manual (Page 2)

TURBO 350 TO TOYOTA LAND CRUISER
AUGUST 1980-89 (19 SPLINE)
ADVANCE ADAPTERS INC. P/N: 50-7401
P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711074-19
Paso Robles, CA 93447 PAGE 2 OF 4
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 08-03-11
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.
INSTALLATION INSTRUCTIONS
Due to the split design of this transfer case, a shop manual is handy for disassembly. The transfer case must be
disassembled to install the adapter.
This kit is for the GM TH350 3 speed automatics to all Toyota Land Cruiser split-type transfer cases. The design of this
kit utilizes two shafts. The first shaft is your TH350 output shaft that is cutoff to the length as illustrated on Page 3. With
the shaft cut to the proper length, the new Advance Adapters spud shaft can now be put into position. The new spud shaft
should be pressed into the new rear bearing so the external snap ring is towards the threaded end of the shaft. With the
bearing on the spud shaft, you can now install the assembly into the back portion of the adapter. The external snap ring
will lock the spud shaft into position. A special heat-treated gear spacer has been provided for determining the exact gear
location. Before installing the spacer on the spud shaft, we recommend applying some RTV silicone on the spline portion
of the spud shaft that this spacer covers. This will prevent any fluid transfer between the two gear boxes. The threaded
portion on the end of the spud shaft will be identical to the 4 speed transmission being replaced. The original gears, bearing,
washer, and nut will all be reused onto the new spud shaft. The stock transfer case lock nut is Toyota P/N 90179-26004.
The transfer case indexes to the adapter off the new rear bearing and we also use the lower dowel pin on the transfer case.
The upper dowel pin is not used and our casting hole has been over sized to fit over the stock dowel pin location. The bearing
give the proper indexing and the lower dowel provides the proper rotation.
On the right side of the adapter, you will be able to mount the special shift bracket (illustrated on Page 4). This bracket
should position your shifter in the original floor board location. The bottom of the transfer case adapter has a support mount
that is identical to the FJ62 support that was previously used on the bottom of the 4 speed transmission. The original
crossmember support will need to be repositioned directly beneath the new transfer case adapter housing.
GM TH350 3-SPEED AUTOMATIC:
When installing the new transfer case adapter, make sure that the coupler and the output shaft do not bottom out. We have
found on occasion that a transmission output shaft may be slightly longer than what we have allowed for; and when coupling
into our new spud shaft, we find a small amount of interference. The adapter housing and spud shaft must be assembled
to the back of the transmission without interference.
DO NOT FORCE THE NEW TAILHOUSING ONTO THE
TRANSMISSION. If assistance is needed, please feel free to call us on our toll free number, (800)-350-2223.
When assembling the adapter housing to the transmission case, we have provided you with a new square type "O"-ring
seal to prevent fluid leakage. This seal is a stock GM item that is used on all TH350 installations. On most installations,
a slight pan modification may be required for clearance of the front Universal yoke.
P/N 716062 - The special nylon bushing is for use in the end of the stock TH350 output shaft. If you are not
disassembling the transmission, this part will not be used.