There is a story to go with the sticker or imprint. The 83's did not have them, and I'm not sure the 84's did either. There was a very vocal individual who somehow managed to get his story published in a lot of magazines about how he forded a stream, and sucked up water into his new in-warranty F series truck. His dealer would not warranty the bent connecting rod or other water related damage, so he wrote to Ford. Ford responded by sending him a sticker, with instructions to apply the sticker in the location indicated. Obviously the guy thought this was rather gratuitous and so he tried to rally support by making his story known to as many as he could. Needless to say, I didn't at the time meet anyone who had any sympothy for the guy. True, the intake was pretty low, and moved to the top of the core support in subsequent years, but you would think if your going to take your truck where a boat would normally go, you might re-think the application a bit.