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I had this problem, after getting trans. rebuilt ($2000.oo) , replacing speed sensors twice, Found out is was the instrument cluster sending false speed readins. Hope this helps.
I had this problem, after getting trans. rebuilt ($2000.oo) , replacing speed sensors twice, Found out is was the instrument cluster sending false speed readins. Hope this helps.
Welcome to
How did you determine it was false readings from the instrument cluster?
Took it to the local dealership,after about 2 weeks he said he couldn't get the truck to act up,so finnally he suggested hooking up his monitor to the truck & he and I went for a drive, me driving,he watching the monitor,after only about 5 miles it did it,OD light started flashing which means it is in limp mode. The monitor was reading 119 mph,we were going about 60. He said he thought it was the instrument cluster,so I had him to replace it,no more problems.