I have a 97 k1500 4x4 Z71 regency addition. I wanna put new oil in the differential, front & back. I know the weight im just trying to figure out how much i put in it. The front is 1 3/4 qt n idk the ring gears for the back. I havent had a chance to give it a look but i work at autozone and found out some of what i need. So i figured id ask and see if anyone knows off hand. 2nd question is has anyone use motorkote? My dad told me about this stuff n said semi drivers use it in there trucks n its supposed to be godly lol. You can use it in oil, transfer case, crank case, differential, power steering, n transmissions. Its a friction reducer and i was kinda asking for reviews. I bought it but i could bring it back if it sounds terrible. I was just wondering if anyone used it. Thanks!