dzet, on my 2001 ETH truck, on the passenger's side on front of the engine compartment, in front of radiator is a steel plate riveted to the truck that has all codes for engine, transmission, paint, ... stamped into it. Maybe your's does also.
Tom
------------------
Tom Golden
Godzilla: Patriot Blue 2001 2500 SLT QC 4X4 LWB ETH/DEE, Tow & Camper packages, 3. 54 Ltd. Slip, 4 wheel disc ABS, Isspro EGT/boost gauges, black SmittyBilt nerf bars, K&N RE-0880 & pre-filter, no silencer ring, TDR decal, Jack holiday antenna ball
NRA Life/CRPA/El Dorado #26 F. &A. M. of California