ADVANCE ADAPTERS INC. P/N: 50-1806A
P.O. Box 247, 4320 Aerotech Center Way
Paso Robles, CA 93447 PAGE 1 OF 2
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 05-06-11
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.
KIT CONSISTS OF:
No. Qty. Part No. Description
INSTALLATION NOTES:
The linkage on the Toyota transfer cases will vary. Some have the control lever on the tailhousing of the original 5 speed
transmission while others have it on top of the transfer case. This adapter can be used with either style and if the opening on
the top of the new adapter is not used, you will use the parts included with the kit to cover up the exposes opening.
Make sure the bearing retainer clip found on the front side of some transfer cases is removed prior to assembly of the new
adapter. This clip was used to retain lower bearing in Toyota transfer case.
The coupler in this kit is made for a 21 spline male shaft that protrudes from the front of your transfer case. When replacing
transmissions that were equipped with turbocharged engines, you will need to use a 23 spline coupler in place of the 21 spline
coupler furnished with this kit.
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 coupler 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. Some early model transfer case input shafts (1979-
1980) may need to have a spline relief ground in the Toyota shaft to permit the proper spline engagement.
1. 1 51-1806 ADAPTER HOUSING
2. 1 52-1806 SPUD SHAFT 23 TEETH INT. x 21 TEETH EXT. (Installed in Casting)
3. 1 716063 COVER PLATE
4. 1 716308 BEARING (Installed in Casting)
5. 1 716450 SNAP RING (Installed in Casting)
6. 1 716456 SNAP RING (Installed in Casting)
7. 1 716564 GASKET (Toyota Transfer Case)
8. 1 716734 SEAL (NATIONAL #471833) (Installed in Casting)
9. 4 720040 8mm x 1.25 x 20mm BOLTS
10. 6 723704 3/8" LOCK WASHERS
11. 6 723722 H.H.C.S. 3/8"-16 x 1-1/4" LONG
12. 4 723723 H.H.C.S. 3/8"-16 x 1-1/2" LONG
13. 1 TT001 TOYOTA TRUCK INSTRUCTION MANUAL
NV3550 5 SPEED TO TOYOTA
4WD TRUCK T/C - 21 SPLINE INPUT
Note: The NV3550 output
shafts must be shortend so that
it is flush with rear of the
transmission
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