Hi, new here. I just changed the Automatic transmission in my 1999 3.8L V6 for a 2004 Auto transmission (also from a V6) i got at a junkyard. I called the dealer and they said that the trannys themselves are both the same and the swap should be fine. Everything went as planned with only one exception and that is that the speed sensor had a different style connector on the 04, same 2 wires, just a different plug. I spliced the 04 connector into my 99 wiring harness (I didn't just swap the sensor because the 99 sensor was melted) then I took it for a drive.
It shifts way too early and when I am going about 25mph, the speedometer says I am going 100mph. I'm thinking 1 of 2 things, either get a 99 speed sensor, or does the computer need to be reprogrammed?? Or is it something else entirely? The car is bone stock, what would be the cheapest way to solve this issue? Any help would be appreciated, thank you!!
It shifts way too early and when I am going about 25mph, the speedometer says I am going 100mph. I'm thinking 1 of 2 things, either get a 99 speed sensor, or does the computer need to be reprogrammed?? Or is it something else entirely? The car is bone stock, what would be the cheapest way to solve this issue? Any help would be appreciated, thank you!!