My question, why can't I find a regular brand name 80-90??? Metal Shavings — Metal shavings, which are often remnants from the housing machining process, may adhere to the plug magnet. Large metal deposits or particles on the plug magnet, such as gear teeth, bearing fragments and large metal shavings, are not a normal condition. Seemed like nothing came out! I am getting the truck ready for winter and need to change the front and rear diff fluid. I was wondering if there is a drain and fill plug on the front diff, or if I have to pull the cover? An easy to tell if you need additive. The differential on your Chevy works in conjunction with your transmission to turn your wheels.
Took Passenger side heat plate off two screws , removed shift cable from bracket and used a pry bar to move bracket back a few millimeters to allow pan to drop. I bought some super tech synthetic blend 75w-90 gear oil. It will provide better protection and the cost isn't really that much more. To place an order please call the order at 888-824-2012 or toll free. If your truck is equipped with a G80 locking differential, and you haul your camper often, I'd change it every 15-20,000 miles. Rear-wheel drive vehicles only have rear differential fluid. I reconnected hose and added 1 Gallon of Concentrate and 1 Gallon of water.
I have also tried running some searches but I guess my searching skills are weak because I can't find anything. That one required an additive. The synthetic diff fluid will work over a big temperature range and actually simulate more than 75w-90 range. I have a 2500Hd 6. I'm a little too cheap and stubborn.
If you hear any noise from the diff then you need the limited slip additive. Fine Metal Particles — Fine metal particles are normal and are the result of internal component wear, which can shed fine metallic particles at a steady rate. Steve Is there a drain plug in the front? Six quarts should be plenty. In the owners manual and Chilton service manual the fluid recommended for the rear ends on these trucks is suppose to be 75W-90 synthetic, probably because of the G80. Fill to a level between 6 and 9 mm 0.
Upgrading to full synthetic isn't a bad idea if you dont mind the extra expense. I changed all the fluids on the truck. The riding mower and the Celica get the used oil from the Vette. I am very familiar with fluids and what works for me. This forum is meant only for members who wish to post the specific steps to complete a project or modification of some sort. Milky-colored fluid combined with rust particles is a sign of moisture contamination either from submersing the axle vent, a pinched or misrouted vent hose, or a failed seal that is allowing moisture to enter the axle. I go through the stuff often enough.
Mobil 1 Synthetic also says add it. You may want to take this opportunity to change differential ratio, to better suit your pickup truck application requirements. If you hear any noise from the diff then you need the limited slip additive. I've googled the crap out of this topic and still can't find a definite answer. If you experience some chatter then you can add a small amount until the chatter stops. Swap out with the new synthetic fluid.
Your Chevy will take about 2 pints of differential oil. If these conditions are found, repairs may be needed to prevent further component damage. Note - Many report finding lot of contamination in the oem lube in front differential. Do you have a G80? I've read where you can put synthetic 75-90 all the way around, but I go by the book. If it is black you can get the white one from the dealer. The truck is old, looks like the axle seals are starting to seep, I'm gonna just go with 80-90.
Supply the parts to your mechanic and save money. Those silver flakes are most likely the result of friction within the axles and wearing off metal. Or just throw it in. The closest thing I found was Valvoline, but it said limited slip on the front of the bottle. Vehicles referenced above that were built after April 1, 2004 were manufactured with front axles containing synthetic axle lubricant and do not need to have the front axle fluid inspected or changed. The Rear is easy to remove the cover the front would be alot of work. My question is, what type of fluid is supposed to be used in the differentials? Mobil 1 Synthetic also says add it.