Where is the overdrive relay switch on a Volvo 780?
Please go to this URL. I think 780 has the same relays and locations:
Really depends on year, engine, and what you're using it for. For a freight hauler running just a five axle unit, if you were to get a brand new one with the ISX, the engines of 450 horsepower or less for 2014 have their power band from 1250 to 1350 RPMs, so you might want to consider something like 3.36 rears with a .73 or .74 overdrive transmission, or possibly 2.93 or 2.85 rears with…