I have a 99 k3500 454 truck that had the black box I read were it seemed like allot of people have done the 411 swap over the last couple years but know when trying find more info seems like allot of people talk about it but have never even done it. I have always had several issues over the last year and have gotten some worked out from others here and allot of reading but still having a knock problem. I always just figured it was maybe false knock but it is real. I noticed the other day cruising down the interstate about 65 or so and if you load into it I could hear pinging had windows up and a/c down real low and radio off. So today I was back on interstate and had laptop with me and could really see it. About a month ago I also was towing my 36' two car trailer with a Altima and expedition on it running some windy hilly country roads and noticed it was knocking then on laptop but couldn't hear it. Kr1 is while I was loaded. Knock and knock 1 are just truck on highway no load. Here is also tune Please help before I tear this motor up. I really like all the added benefits of the 411 but am really thinking when do I have time to repin everything back to the blackbox.