ADVANCE ADAPTERS GM CIRCULAR 32 NP205-29SPL INPUT TO GM 6L90 29 SPL TRANS

This adapter kit will adapt the New GM automatic 6L90E 4WD to the GM NP205 transfer case with circular 6 front bolt pattern. Kit 50-9552A, 6L90E adapter assembly includes new female 29 spline NP205 input gear and shaft, NP205 adapter ring, 6L90E conversion tail housing, input shaft bearing and fastening hardware.

Transfer Case:
This adapter assembly fits the GM NP205 part time transfer case. The GM version is a part time, cast iron and offers a 32 spline female input gear, circular six front bolt pattern and a passenger side front out put shaft. Used from 1985-1991 GM 1 ton trucks

Transmission:
GM's new Hydra-Matic 6L90 transmissions are the first of a new family of modular six-speed rear-drive transmissions. The transmissions feature two overdrive gears and a wide, 6.04:1 gear ratio spread to improve performance and fuel economy when compared with conventional four- and five-speed automatic transmissions. With two overdrive gears, engine rpm is reduced by approximately 9 percent at 60 mph - a reduction to about 1,500 rpm. Lower engine rpm can bolster fuel economy because less fuel is used. A lower-rpm cruising speed also enhances smoothness and reduces noise heard in the vehicle's cabin.