My 90 T4R 3VZE Auto 4x4 (4.10 ratio) was fitted with 31x10.5's at some point before I bought it. With those larger tires, the speedometer has GOT to be incorrect. That means my ECU is getting the wrong speed reported to it as well, which maybe could cause it to shift at the wrong time? Sure seems like it's confused about what gear to use sometimes. Cruise control is a joke right now... lol it changes gears constantly while driving down the hwy.
I know that on a Ford you can get a replacement speedo-gear for the tranny that corrects the speedometer when you change tire sizes. They have a different color coded speedo-gear for various tire sizes that you may have switched to.
So is there some similar procedure for my T4R? I know that this thing doesnt use a speedo cable - its electronic somehow - so what do I do to make the speedometer read correctly with my 31's?
Thanks in advance. I tried searching the forums for the answer and couldn't find it. Go easy on the n00b.