adfac
Well-known member
Recently, I had the rear end of my 1986 automatic converted from a 2.73 to a 3.54. Everything was successful. So now my speedometer doesn't read correctly. I figure it's about 20 mph off. Can anyone tell me what "driven" gear goes on a 1986 with a 3.54 and does anyone know where I can even find one? And is that all you have to do or is there something else? I have no idea where to go from here. I bought a Dakota Digital SGI-5 universal signal interface from Summit figuring that might be the easiest way to go but it's not specifically for a corvette and doesn't tell you what wires go where and where you can find them on an 86 harness ... so I'm abandoning that idea. It's over my head. I'd really like to do this right so if anyone could offer any help with what to do next to get my speedometer back to reading correctly, I would really appreciate it. Thanks.