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Byron (BCG),
My experience with JY transmissions is as follow(s):
I pulled two transmissions back in 2013, and placed one of them in my 1989 transmission swap, the other was kept as a spare.
The first transmission that I put in, tended to leak at the rear after I filled it if I set it on its side at the top of the transmission, which usually sees very little oil as it sits closest to the car. This is why when I do a clutch replacement, I never place the transmission on its side when it has oil in it, as it will most likely leak.
The transmission that I swapped in my 89' has a bad bearing in 3rd, and 5th gear, but it just keeps on going. I even swapped it out at one point as I wanted to test the spare. The spare was much quieter, and I thought it was fine. I was wrong. A short time later, about 6 months or so, the input shaft bearing went south, and one Sunday I just couldn't take it any longer. I, along with my son, replaced it in about 4 hours, and its been going strong ever since.
So I guess after a long winded answer, you're going to just have to shove it in and see what you get. Its the chance you take. It was the chance I took, and it paid off.
I now have 3 M47s sitting on two bench's. One is the spare that I mentioned above, and it is slated to be rebuilt sometime in the future. Another one I already know runs and sounds fine, and is slated to go into my son's 90', and the third came out of a JY 93, which I believe it needs to be rebuilt as well, because it looks like the Exxon Valdez, and that will go into my 93 project car once done.
I plan to take the one that had the input shaft bearing roach, and rebuild that first as a learning experience as I currently have nothing to loose with it. From there I will have made a list of bearings that I need to rebuild the rest. It will be a slow process, but it will be well worth it once I can put one of these back on the road and have it run flawlessly.
Hope all of this helps and makes sense.
Matt
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1989 - 245, 1990 - 245, 1991 - 245, and 1993 - 245
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