* Transmission Type: Both years used several different transmissions. You need to identify the *exact* transmission in both vehicles (e.g., 4L60E, 700R4). The part numbers on the transmissions themselves will be crucial. Simply saying "4x4" isn't specific enough.
* Bolt Patterns: While likely similar, the transmission case bolt patterns might differ slightly, preventing a direct fit.
* Input Shaft: The input shaft length and spline count could be different, preventing it from properly mating with the engine.
* Transfer Case: The transfer case connection might not be compatible.
In short: You need to compare the transmission identification numbers on both transmissions to be absolutely sure. A reputable parts store or a mechanic specializing in transmissions will be able to help you identify the correct transmission and determine compatibility. Simply assuming they'll work because they're both S10 Blazers and 4x4 is risky. You could end up wasting money on an incompatible part.
