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Shouldn't need to disassemble the trans at all. The seal is just a press fit. Should be a lip on the outside diameter, that you can slide something under, and pry out the old one, then us a piece of pipe, or something similar, of the correct diameter, to drive the new one in.
Also, I would expect that bad u-joint smoked the seal, rather than the other way around. Consider where the U-joint hangs out, a bit of extra lubrication sure ain't gonna hurt it. It vibrating around though, will trash the seal in pretty short order.
There's a couple different designs used over the years, that's one of 'em, another has a longer 'cup' on it, that sticks out further, they both do the same job though.
It was kind of a pain in the a$$. to get out. It was pressed in tight. It had been in there for years and interestingly, the old seal's metal press ring was twice as long as the one I put on...it was almost an inch wide...
I had a seal removal tool and it didnt budge it. I had to use a small screwdriver all the way around the ring, then a larger one all the way around...and within all that action I used a small hammer tapping the screwdriver in between the case and ring. After about 40 minutes, it finally came out.
A 2in PVC cap works pretty much perfectly to tap the new on back in...
My trans oil needs to be change...it is dark red...no smells of being burnt - it is just OLD...the trans works fine...I am always skeptical about trans fluid changes - but I do have access to the machine...I should do it - right?
I would just change the filter, and whatever fluid comes out of the pan. Flushing a high mileage trans never seems to work out well, unless it has been done regularly.
Transmission output shaft seal
