I would think the original computer for the 93 Silverado would have been the 16168625 with a 4L60E http://www.gearhead-efi.com/Fuel-Inj...Information-E6
or the 16196395 with a 4L80E http://www.gearhead-efi.com/Fuel-Inj...Information-OE

Is your transmission computer controlled?

dave w