Yeah, thats what i figured since ford's old gear boxes used 80w90. That is the old granny trannies: borg warner T18, T19, new process 435, and so on, along with a lot of eaton fuller transmissons used to use 80W90 till they switched them to synthetic 50w. Most Gear boxes used 80w90 gear oil and why not this one . Thanks for the help. This weekend i will try to look at the tag to double check what kind of trans it is and what fluid is recomended.