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Chevy, Dodge and Ford all used variations of this transfer case. All were chain drive to the front output. Some were full-time 4WD while others were part time. While the whole case is very large heavy and clunky, they have attained popularity through the use of the front "range box" section which is then adapted and mated to the front of another transfer case, a dual transfer case setup commonly known as a "Doubler".
Transfer Case Specifications:
Low Range reduction ratio: 1.96:1
High Range: Direct (1:1)
Chevy 203
Input Spline: GM used three different input spline
configurations on these cases.
10 spline: (1971-79) Used behind SM465 transmissions
27 spline: (1971-79) The units supplied with a T350 automatic have a 27 spline female input shaft.
32 spline: (1973-77) This is the preferred shaft, as it is the strongest. These came behind Turbo 400 trannies.
Bolt Pattern:
Is an asymmetrical pattern unique to the 203. It is possible to disassemble this case and re-drill it for the 6 bolt circular pattern. An adapter is also available to mate this case to Jeep, Dodge or Ford 6 bolt circular applications: adapter PN AA50-0202
Ford NP203 Transfer Case
The Ford NP203 has a 31 spline female input. The bolt pattern is the Ford rotation of the 6 bolt circular bolt pattern.
Use with a Klune-V Extreme underdrive:
Use the Klune with the 31 spline output. These units will bolt up directly.
Dodge NP203 Transfer Case
The Dodge 203 has a 23 spline female input. Later model Dodge transfer cases use the 6 bolt circular bolt pattern. Early Dodge 203s use the same front bolt pattern as the early Chevy unit. It is an asymmetrical pattern unique to the 203. It is possible to disassemble this case and re-drill it for the 6 bolt circular pattern. An adapter is also available to mate this case to Jeep, Dodge or Ford 6 bolt circular applications: adapter PN AA50-0202
Use with a Klune-V Extreme underdrive:
Use the Klune with the 23 spline output. These units will bolt up directly.