Oil needed in Eagle Transfer case, Miter Box & 4 speed Transmission

[Gary LaBombard]

I have been searching for straight 90wt. oil to use in my 1973 Eagle transfer case, 4 speed transmission and miter box but in my area there is only 80/90wt oils available.  I was trying to reach Clifford about this but I may have lost my email in heaven.  anyhow I know he will see this here but is there a problem using the 80/90wt or continue looking, perhaps at a Farm Tractor supply for the 90wt.  Also, is there any special additives I need to know about being in the oil while searching? 

[luvrbus]

Gary,I always used 85/140 Valvoline you can buy it at O'Reillys 120 bucks for 5 gal you will need 5 gals for the drop box and differential those are not separate fills then the mitre box will hold the rest,I forgot how much the transmission will hold probably - or+ 2 gals. I add no additives but that is your call

good luck

[Gary LaBombard]

As always Clifford, thanks for the expert advise and I will look for the above grade of lube.
Gary

[Gary LaBombard]

Clifford,
Is this gear oil from Tractor Supply sufficient for my bus"
http://www.tractorsupply.com/tsc/product/traveller-multi-purpose-gear-oil-85w-140-5-gal
$59.99

[luvrbus]

Yep it's good lube Gary and the price is right.I read where it is Citgo brand packaged by Warren fwiw