1926 Brown-Lipe Transmission. What oil to use?

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I have a Brown-Lipe (EDIT it's a model 20) 3-speed transmission in a 1926 Gotfredson farm truck. I want to do an oil change. Any idea what weight or type of oil to use? Just 90W gear oil? Same question on the rear differential. What weight oil? Specs are below. THANKS in advance!

EDIT: I saw some other specs on a similar model that said the rear differential worm wheel assembly was made of "special alloy bronze," which may dictate what type of gear oil, I am guessing. Mine has a bevel gear so not sure if any of the gears in mine are bronze.

Here are the specs for mine:

Gotfredson_20B_zpsbirh4gwd.jpg
 
my dad is 94 years old and started driving trucks and hauling produce out of Colorado,California,Florida,and other places when he was 14 yrs old.The IH trucks that they had they installed Brown-Lipe transmissions in to get more power.The trans specified 90WT Pure Mineral oil.You can still buy this because I just bought some a couple months ago and it is around the same price as regular 90WT.You will want to use the same thing in your rearend because of the bronze.Mineral oil has no additives that will attack the bronze and ruin it.Steve.
 
I am thinking about a GL-4 90w gear oil. Supposedly they are copper and bronze friendly.
This NAPA brand is conventional oil made by CRC:

API/GL-4 Multi-Purpose Gear Oil SAE 85W90

http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Gear-Oil-Automotive-1-GAL-CRC-
85W90/_/R-SLRSL24239_0006410049

Also saw this GL-4 by Brad Penn, but green in color? Bla.

BRAD PENN, MULTI-PURPOSE 'CLASSIC' GL-4 SAE 80W-90 GEAR OIL
http://www.penngrade1.com/Products/Gear-Lubricants/GL4-SAE-80W90.aspx
 
I ended up going with this:

MasterPro Chemicals - Gear Oil
Part # 80040

GL-4, 140W

http://www.oreillyauto.com/site/c/detail/MP03/80040/N2643.oap?ck=Search_N2643_-1_-1&pt=N2643&ppt=C1985
 

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