Thanks for the replies.... I think I will run 80w90 in the tranny and rear and run 134 in the hydraulic. I was more scared about 80w90 in the hydraulic system. Sounds like the 134 is more likely to leak into the rear end.
Thanks again for the replies... Hope to get the old tractor rolling again this weekend. Been a long drawn out project but now that the tractor is coming back together, I am anxious to run it a little bit.