Ok, here we go.
So I got it on the road, and the trans was running great. I DD'ed it for about a week and a half, before I heard it.
Going uphill under load (think freeway speeds) I started hearing a noise similar to that of an idler pulley that is about to explode. Which is what I thought it was, until I got to the top of the hill, then it went away. As I went down the other side, a vibration in the floorpan. Road levels out and its gone. Noticed it again a day later, again on my ride to work. Long story short I figured it out.
Uphill, under load, 3rd or 4th, a tinny idler-about-to-explode sound. Coasting down the other side a vibration. Nothing in 1st or 2nd. Trans shifts great, converter locks up nicely. No codes, no burnt fluid, nothing. Unfortunately, or conveniently (depends on how you look at it), the rear main also sprung a leak. So the trans had to come out.
Dropped the pan and found dark oil, and the typical amount of material, but nothing unusual. Keep in mind, I never changed the ATF, so this oil is many many years old
I decided, what the hell. Stood the trans up and drained the rest of the oil out.
With nothing usual seen from underneath, and no visible signs of a bad converter, I decided to pull the front pump out. I looked at it this way: I have a spare 2wd E4OD from the parts truck, so if I need to replace the converter or pump, ive got one.
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