Advance Adapters 50-4903 - Manual (Page 2)

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.
This transmission can be identified by a case length of 12". The casting numbers on the case should be GM465452, 6273212
or 3901127. The top shift cover casting number should be GM3901131. The P.T.O. opening is available on both sides
of the main case. This transmission has a non-synchro first gear. The gear ratios for this transmission are as follows:
First Gear 6.56
Second Gear 3.58
Third Gear 1.70
Fourth Gear Direct
Reverse 6.09
In order to use this transmission with the Advance Adapters kits, you must make sure that you have the proper output shaft
from the original 4 speed transmission to couple to the new adapter. Currently, we manufacture the adapter for 35 spline
output shafts only. If your transmission has a 31 spline output shaft, then you will be required to change to the other designs
listed. The correct transmission can be found in all two wheel drive vehicles, 1968 and up. The transmissions which are
not compatible are 1981 and up four wheel drive K1, K2. The part numbers for the new shaft, if required, are as follows:
GM Part No. 3932265 - Output shaft with 35 splines
The output shaft is held into place by the transmission output yoke and nut. When using this kit, the nut and yoke are
removed. To retain the output shaft from moving back and forth in the transmission, we've included a set collar to hold
the output shaft in the proper position in reference to the rear output bearing and transmission case. The set collar should
fit snug up against the rear output bearing and then locked into position.
The new spud shaft that we have furnished with your kit must slip over the output shaft without bottoming out or causing
spline interference. The spud shaft is located in the correct position by using the bearing that is mounted on the back side
of the new adapter. With the spud shaft in position and the adapter on the new transmission, you must be able to rotate
the shaft freely. There are certain applications that may require a slight grinding of the original output shaft to prevent the
original shaft from bottoming out inside the new Advance Adapters coupler. The threaded portion at the very end of the
shaft along with a portion of the splines will need to be removed. This can be done with an abrasive cutoff saw and must
be done for clearance inside the new adapter coupler.
The adapter plate that we have furnished for your new transmission has a special pocket that has been machined into the
transmission side for clearance over the reverse counter shaft. Make sure that the counter shaft in the transmission is
rotated for proper engagement into the new adapter housing.
The right side of the main case will need to be ground off for clearance of the front output yoke on certain installations.
We recommend a trail fit with your transfer case and front output yoke so that any modifications that may be required can
be done before final installation. This is a good time to set up the shifter linkage for the transfer case controls. You will
need to fabricate a support for the transfer case linkage pivot. Advance Adapters does not provide any type of bracket
for this particular transfer case. Make sure that you use a gasket between each of the two (2) adapter plates and that the
gear locator bushing be installed between the output bearing and the input gear of the transfer case. The stock transfer
case lock nut is retained to hold the two gears in position. The stock Toyota nut is P/N 90179-26004.
GM 2WD TRUCK 4 SP MODEL SM465 TO
TOYOTA LAND CRUISER 1980-89 (19SPL)
ADVANCE ADAPTERS INC. P/N: 50-4903
P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711049-19
Paso Robles, CA 93447 PAGE 2 OF 4
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 08-03-11