Marshall, your kid brother just left out of here with your truck, the output seal of your transmission is leaking and we added 2 qts of 75-90 , I put synthetic in it since that was what you were running and then gave him 2 qts for the road, I also made up a wrench for him so he could pull the plug to check the level. Try to get another seal for it in the morning and you will be ok.
Cheers, Kevin
Cheers, Kevin