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Started my truck (80' C10 with a 2018 L83/6L80 swap) today and had a weird noise coming from what seemed to be the trans. When I put my truck in drive my digital readout showed 157mph while sitting still. Hooked up my HP tuners and started to log and in park while sitting still it also showed 157mph. What could be causing this issue? Truck was parked with no issues just yesterday.
going that fast in park isnt safe , should slow down
Another crystal ball post.
Problem was simply an unmarked fuse that got pulled to replace a shorted out one on another project. The company the built my harness must have passed one of the signals that goes from the TCM through my fuse panel and didnt mark it. No idea why they routed it that way. So I always thought it was just an extra. That fuse missing caused the transmission to give off some odd readings and basically go into limp mode which is why I was getting the high speed rating.