type of gear oil to use in gear boxes

[timntrucks]

going to top off the oil levels in the diffs and the gear boxes on my m816, getting some noise in the gear box on crane. i havnt checked it and it has a little leak. not a big one, just a drop or two a day, but dont know how long it has done this. there has been some types talked about latly. thanks in advance Tim

 

[clinto]

Lube Order calls for GL-1 90 weight. Napa sells it in 5 gallon buckets under part # 65-205.

Much difference of opinion out there. Consider the price of free advice, etc.