This is a very popular and long-since discontinued Downey adapter kit that mates a 23-spline top shifting gear drive mini-truck transfer case behind a GM 4L60-E 4-speed automatic transmission.
The required transfer case will be a 1979-1995 4cyl gear drive t/case converted to either a 1979-83 or 1985-88 EFI top-shift style with a 1986-87 23-spline Turbo Input Gear, available separately here.
The adapter plate was bolted to a reduction housing but removed in our shop. It has never been put in service and is in very good condition. We have one kit available
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