diff fluid?
#2
Valvoline 80w90 white bottle, or pay an extra 1 dollar and get the blue bottle durablend 80w90 with ford LSD addictive ( much cheaper then gm lsd addictive, and better ). Change out every 15k miles. get 2 bottle of gear oil. BTW order online at advance auto part and enter this code during check out BIG5 and get 5 dollar off 15 dollar. yesterday I bought 2 quart gear oil and gasket total is 12.99. dont plant to change out the rear end yet, being too lazy.