Gear Oils

[rastenborg]

Manual Transaxle: 1.3 qts Gl5 SAE 75W-90
Rear/Front Differential Oil GL-5 SAE 90W R 1.6 Front 1.3 Qts
Transfer Case fluid GL-5 SAE 75W-90 1.8 Qts

Uhhhm, Would Wal Mart GL-5 80W-90 be OK for all applications?
The 75 is a little lower than 80W

Minot ND-Winter: -20 to 20 Degrees most days.
Summer: 50 -90
Some very cold nights and Some very warm days with a 110 Degree Temperature Variation.

Plus: 4WD works fine in Low Range. The on the move High Range makes noise.
Is the 4WD Tranny a separate part form the 2WD Tranny? Looking to find a used 4WD and then swap out.