2011 Silverado 1500 4x4 front axle lube -- 80W-90 or 75W-90?

[timweidner]

The owners manual on my 2011 Silverado 1500 4X4 is a bit confusing on the topic of lubricants to use in front and rear drive axles (see attached photo below from manual). It appears that all rear axles for that year call for 75W-90 synthetic axle lube, but it is not clear about what is called for in the front axle. The first line calls for 80W-90 lube in 1500 series, four-wheel drive, then the second line calls for synthetic 75W-90 lube in all series, but doesn't reference four-wheel drive. But that second line has to be referring to a 4X4 front axle because if it was a 4X2 truck it wouldn't have a differential in the front axle and therefore wouldn't need diff lube.

 

Thoughts? Thanks!

 

[WilliamBos]

Last trip to the dealer I asked this same question, the said 75W90 is just fine. It holds 1.43L/1.51 quarts. Drain and fill plugs get torqued to 24 foot pounds.

[txab]

75W-90 just like the rear diff

[timweidner]

Thanks guys!