He has actually changed the seal design in the tail housing. I went through two different epoxy seals, in about 2 weeks. THe seal was fine, jus the epoxy broke down, I am guessing driving a straight 400 miles heats things up a little bit and the epoxy can't handle the heat. So talkng with him, I guess somebody with the same problem, found a press in seal that you have to bore the tail housing out and then press this new seal in. I got the first one over nighted from him, just in time to install it that weekend. Great guy Tom is, talked with one of the service guys and told him my problem, he wasn't sure what to tell me, then Tom called me back and told me about the new set-up and I had it the next day, free of charge and he paid the shipping both ways. Thanks Tom.
On your 90, though I am not sure if you'll get the late model Yoke set-up, I would ask for it if you can, you get a serviceable CV joint. This is very important specially if you live in the North/Salt areas of the country.
I know a intial $900 is a bit much, but as long as you send him the parts back, you get you core refund. The only other thing you could do is find a 231 and pick up a $169 PORC HD SYE, probably cheaper and stronger in the long run, but you loose the Full-time advantage of the 242.