Tundra 2002 Drive train

I have heard of several complaints about the Toyota Tundra Drive Train. Vibrations in the Rear and seal problems. I have 36000 miles on my 2002 Tundra and I have had to have the rear end rebuilt because the seals leaked. I just had a new transmission installed because the last one died on the road. This new transmission seems noisy and and vibrates during acceleration. I am hoping I can get 100,000 miles out of this truck before it falls apart. This will be my last Tundra.