So pulled 460 auto slapped a cummins 5 speed in. An cut the trans harness and now the speedo is sayig 85 mpg any idea where i should start looking . The trans harness is unplugged under hood.
Thanks man been here for a while, it has been a good resource for my build, just found something i can hopefully help with.Not to hijack, but nice to see you over here Johnny499!!!
I am sure you are correct on this, it also goes to the anti lock brake controller as well as the cruise control. I will double check my schematics and see what i can come up with for possible cause/fix.I believe it hits the ECM inbetween