* SM465 4-speed manual: This was a heavy-duty manual transmission often found in the heavier-duty trucks.
* TH400 3-speed automatic: Another heavy-duty option, though less common than the SM465.
* 700R4 4-speed automatic (less likely): While possible, it's less likely to find a 700R4 in a 1992 2500 4x4, as the 4L60E was starting to replace it in these trucks.
To know for certain what transmission was in a *specific* 1992 Chevy 2500 4x4, you would need to check the vehicle's documentation (owner's manual, build sheet if available) or look at the transmission itself (the casting number will identify it).
