Front differential oil for a 2004 Z71 Tahoe

[Skone]

OK, so I have a 2004 Z71 Tahoe and I’m needing to change the front diff fluid and would like clarification on the correct weight and type of oil regarding synthetic and nonsynthetic, my Tahoe does not have a white fill plug so I assume it’s non-synthetic, I live in Colorado and it’s about to be summer so also wondering about suggested weight of oil. Any help would be great. Appreciate you guys.

 

[Big Mama]

Looks like 75-90 is the weight in your choice of brands.