No I have not done that yet. I will probably do that here in a minute. It sounds like what I want to do is a complete tear down. You think you could tell me a little about what is involved in doing that? I think 189,000 is a good time for doing something like that. Huh?
You want to do a rebuild? what is involved? .... where to start...???
1. and foremost!!!! READ.. READ .. READ.... research what it is you want to do and why you want to do it. then... make a budget ...
2. prepare a place to do the teardown and expect to be without wheels (or the truck) fora couple weeks. (give or take... prepare for set backs)
3. If all you want to do is replace gaskets/seals with out rebuilding the motor prepare for close examination of parts. (budget for unexpected discoveries)
4. Do you know people who are mechanically inclined and have rebuilt motors? sure it is easy to do. and easy to screw up. When i redid mine it was a work in process as time here and there to work on it. I redid it at work and in a HD desiel mech shop where i was able to lay out all the parts and they were safe from being disturbed for periods of time. I had the great advantage of haveing all the specialty tools at my disposal (saved $$$ there) and had the help of 2 mechanics to guide me.
5. Plan it out... read, and be patient. if the motor in question is running strong, my first thought is why tear out this one? why not drive it till it blows. and in the mean time find a spare motor... as in CL parting out or a scrapyard 4.0l and rebuild it while still driving the one that runs... this is actually what i did. pulled a old 4.0l from my old 91 to place into my 92 while i still drove the 92 till the motor was ready to swap out.
hope this helps you.