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The engine has not been swapped. CAT just sold Stewart and Stevenson an off-the-shelf truck engine. It met certain EPA emissions and had stickers to such effect because at the time it met the military requirements AND the EPA requirements without having anything the military objected to. 30 years later that's no longer the case as the military doesn't want a bunch of equipment that has emissions-only related components that require special servicing, parts, or fluids. The 3116 met the EPA diesel emissions in the 90's without any of that so it got the rating and all of them got the sticker. As additional equipment started to be added for purely emissions compliance the military wasn't interested and as they FAR outweigh the EPA in such matters they continue to use engines that meet their needs and also meet various older EPA requirements but absolutely don't meet any current ones.I believe you re the emissions thing, but my engine has a plate on top that specifically says it's EPA emissions compliant...do you think this means it's not the original engine?
Also, if the A2 has a better transmission controller, but the same trans is it an easy upgrade?
I am not aware of anyone having swapped an A0 WTEC II to a WTEC III. It's a lot different. Probably possible but I haven't seen it. The later and current trucks got an improved transmission around ~2005 and the WTEC IV controller. WTEC III and IV both have a control panel that is completely separate from the TCM and they are located on opposite sides of the truck, while the WTEC II has the TCM and control panel integrated into a single unit under the dash gauge panel.