Originally Posted by HeyYou

Unplug the 8 pin connector on the drivers side of the trans, it's about halfway back. Go for a drive. Keep in mind, you will have ZERO automatic function of the trans. It will stay in the gear you tell it to. So, start in first, slowly accelerate, and make sure you get three gears. You won't get O/D, or TCC engage, as those are electrically controlled. If the trans goes into the gear you tell it to, when you tell it to, then you just have an electronic problem, and more'n likely replacing the governor pressure sensor/solenoid set will fix it.

But first.... Verify that you ARE getting 12 volts TO the trans.

Originally Posted by dtope

Yes I can manually shift through the gears. This happened a couple weeks ago and I put all new sensors solenoids, everthing and it was working for a couple days it just didn't feel like it was locking up in overdrive, but now we are back to the way it was before.

Originally Posted by HeyYou

In 2000, some of the sensors changed, though the wiring harness did not. If you put in sensors for an 01, then something is strange, if you put in sensors for a 98, then it simply isn't going to work the way you want. I *think* the mounts for the governor pressure sensor/solenoid also changed at the same time, but, rumor has it, you can just grab the right stuff from the dead trans, and transplant them into the new one. I don't *think* you need to change the whole valve body, but, not 100% sure on that.

Is the trans temp light coming on as well?

Originally Posted by Branden Joseph Ward

hu there I’m having this exact problem with my 99 I put a trans in from a 01. So what I’m seeing is that if I put bracket and sensor/seleenoid from the 99 in it should fix my issue?

Originally Posted by HeyYou

Yup.

Originally Posted by IndyAxe

Even for automatics?

Originally Posted by HeyYou

Not sure what you are going for here. Manual trans doesn't have any of this stuff.