Advance Adapters AX15 - Manual (Page 37)

SM465 to NP205
stock adapter
TH350 to NP205
stock adapter
37
The NP205 input gears, no matter what vintage or model, are always the same internally. This allows you to swap the input shaft
between the various model transfer cases. One difference that must be taken into consideration is the front input shaft bearing.
The male 10 & 27 spline GM transfer cases used a smaller bearing than the female 32 spline transfer case. The last thing that
should be noted is the bolt pattern change that occurred on the case of the GM NP205 transfer case. In 1985, the case was changed
from a figure-eight bolt pattern to a circular-six bolt pattern. This circular bolt pattern is identical to that of the NP208/241. The stock
adapter housings that GM used are similar; however, the NP205 stock adapter housings have a notch in them for transfer case
shifter linkage clearance.
NP205 originally coupled to a TH350: This transfer case, used in vehicles
between 1971-79, has a male 27 spline input. The bolt pattern is a figure-eight
configuration.
NP205 originally coupled to a SM465: Used in vehicles 1971 to 1984/85, this
transfer case has a male 10 spline input. The bolt pattern is a figure-eight
configuration.
NP205 originally coupled to a TH400: Used in 1979 to 1984/85 vehicles, this
transfer case has a female 32 spline input. The bolt pattern is a figure-eight
configuration. This transfer case has a short input gear stickout of 1.50” from the
face of the transfer case.
NP205 originally coupled to a SM465 or TH400: Found in 1985-91 vehicles, this transfer case has a long
input gear stickout of approximately 3.50”, and a female 32 spline input. The bolt pattern is a circular-six
configuration. This transfer case uses a larger front bearing than the 10 and 27 spline transfer cases.
When using this transfer case, caution should be used with regards to the length of spline engagement.
Transfer cases with this long stickout will require a spacer adapter or a change out to the short version GM
input gear.
GM NP205 (10 spline T/C) to GM 4WD NV4500 replacing a SM465: GM NP205 (10 spline T/C) to GM 4WD NV4500 replacing a SM465: GM NP205 (10 spline T/C) to GM 4WD NV4500 replacing a SM465: GM NP205 (10 spline T/C) to GM 4WD NV4500 replacing a SM465: GM NP205 (10 spline T/C) to GM 4WD NV4500 replacing a SM465:
This package is for a GM 4WD NV4500 to the GM 10 spline NP205 (1971-85). This application requires
the shortening of the NV output shaft to 4.498” in length. When using this kit, we couple to the 31 spline
area which is under the harmonic balancer. In order to cut the shaft, you will need to remove the GM
tailhousing. The NP205 has a 10 spline male shaft. We manufacture a female coupler that engages
the 31 spline transmission to the 10 spline transfer case. We have included a new seal for the adapter
housing along with a new sealed bearing for the transfer case for extra protection. This transfer case
adapter kit uses two castings to couple the NV4500 to the NP205. These castings have been machined
to allow for proper transfer case shift rail clearance. A shifter bracket has been provided to mount the
stock NP205 shifter handle; however, you may be required to modify the handle to properly fit up into the
cab of the truck.
The bellhousing in this kit bolts directly to the front of the NV4500. Depending on the type of
clutch linkage your vehicle has, we offer two brackets to assist you. The kit comes with
Part
No. 715534 , which is a bracket for the mechanical linkage. This bracket provides a pivot point
on the bellhousing similar to the pivot found on a stock GM bellhousing. Some mechanical
linkages use a pivot point off of the engine block which would remain the same. If your vehicle
was equipped with a hydraulic linkage, we also offer a slave cylinder bracket that bolts to our
bellhousing,
P/N 715535 . This bracket is designed to fit 1985-1991 GM slave cylinders
(GM #15615868). You can substituted P/N 715534 with P/N 715535 when ordering this
complete kit.
The recommended clutch components for the bellhousing are found in the GM
Full Conversion Bellhousing section of this manual.
The SM465 is 12” long with an adapter housing of 7.250”. The transmission and transfer case adapter length is approximately
19-1/4”. The overall length of the adapter kit is approximately 1” longer than the stock; therefore, driveline modifications may be
necessary. The overall assembled length including the bellhousing is
26.250” .
P/N 27-0030 - GM 4WD NV4500 to GM 10 spline NP205 transmission assembly
P/N 50-0217 - Transfer case adapter
* P/N 712576 - Bellhousing kit for GM NV4500 (1996 & newer)
P/N 715534 - Clutch linkage bracket
P/N 716050C - Shifter handle assembly
* If you have a 1995 & earlier GM NV4500, this bellhousing kit can be substituted with P/N 712577 .