Advance Adapters 50-1500 - Manual (Page 2)

TURBO 400 TO
TOYOTA LAND CRUISER 1963-73 (3-SPEED)
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.
GM TURBO 400 3 SPEED AUTOMATIC
The GM TH400 has a case length of 24-3/4", 13 bolts for holding the oil pan in position and is available in 3 different engine
to transmission bolt patterns. Make sure you have selected the proper TH400 for your particular engine. The rear side
of the transmission case will have a hex shaped bolt pattern that uses 6 bolts. There are several various lengths of output
shafts that the transmission has been equipped with and all of the new Advance Adapter output shafts will be
interchangeable with your transmission. The new shaft supplied with your kit should be installed by a competent mechanic
The speedometer gear is normally located in the tailhousing, but when adapting it to the transfer case, the location will
change to the backside of the transfer case. The rear transmission support will now be located on the new adapter housing
or, on the back side of the transfer case.
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 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 the number listed above.
ASSEMBLY
Install the 6 studs in the TH400 with Loctite. Install the seals into the casting as shown in the diagram. The seals must
go in through the transmission side of the adapter and the open sides should be opposite each other (see drawing on last
page). Press bearing onto the spud shaft. Using the outer edge of the bearing, press it into the casting. The adapter can
now be bolted to the transmission with the 6 hex nuts. The two 7/16"-14 x 1-1/2" bolts will be installed into the transfer
case through the P.T.O. cover. The remaining three bolts will install from the back of the transfer case and secure the
unit. Install the drive gear and P.T.O. spacer as per your Toyota manual. Reinstall the inspection cover. The linkage
pivot must be positioned so that the threaded boss is pointing up. Install over the modulator valve with the 4 provided
bolts and lockwasher. The stock linkage bolts to this bracket.
On most installations, pan modification will be required for clearance of the front Universal yoke. This modification will
be necessary on both the metal pan and the aluminum transmission case. The area where the pan and case come together
that has the bolts holding the two, will need to be ground down almost even with the body of the bolt. The bolt may need
to be replaced with a socket head cap screw. The modifications can be done with the pan still attached to the transmission
case. The metal pan will need the corner recessed approximately 1/2". The modifications should be made prior to assembly
into the vehicle. In order to allow for additional front drive line clearance, we recommend that the engine and transfer
case be offset to the driver's side on vehicles having front drive shafts located on the passenger's side.
Additional front driveshaft clearance may be gained by using a small yoke and U-Joint (AA PART# 716370) for coarse
spline, 1966-1977, or (AA PART # 716371) for fine spline (1977-80) transfer case front output shafts. This modification
must be performed by an experienced driveline shop to eliminate any misalignment and vibration.
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.
ADVANCE ADAPTERS INC. P/N: 50-1500
P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711015
Paso Robles, CA 93447 PAGE 2 OF 3
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 12-11-00