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Replacing GM/Chevy Fullsize TH350 Automatic Transmission & NP205

Your Price: $1,005.00
Retail Price:$1,023.49
Your Savings:$18.49(2%)
Part Number:AA-27-0031

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Advance Adapters


No. Qty Part No. Description

1. 1 Kit 50-0218 NV4500 TO NP205 T/C 27 SPL.

2. 1 Kit 712576 NV4500-1996 GM BHSG ADAPT. KIT


4. 1 Kit 716050C NV4500 SHIFT HANDLE ASSY.

This package is for a GM 4WD NV4500 to the GM NP205 (1971-79), replacing the TH350 transmission. 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 tailhousing. The NP205 has a 27 spline male shaft. We manufacture a female coupler that engages the 31 spline transmission to the 27 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. The transfer case adapter kit uses two castings to coupling 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. Since this vehicle was originally equipped with an automatic transmission, we’ve supplied a slave cylinder bracket for your clutch linkage (PN715535). This bracket is designed to fit 1985-1991 GM slave cylinders (GM #15615868). A hydraulic clutch system is much easier to install than a mechanical linkage. If you decide to install a mechanical linkage, you can substitute for bracket PN715534. The overall assembled length is 26.750”.


Several adapter kits require you to shorten the existing transmission main shaft while it is still in the transmission case. This is common when a 4WD GM NV4500 is being used. Each instruction sheet gives the exact cut off location. Also refer to the pictures: