Two quarts is all you should need. Replace the plug and you're finished. Althought I would recommend pulling the cover and cleaning out inside and cleaning off the magnet. This will indicate the front pump is working. After 25 mph is will not lock.
Chris Leith Chevrolet in Raleigh was a real pain to deal with in Raleigh, I wound up taking my truck to Randy Marion Chevrolet in Mooresville and they were 10x better to deal with. To ease the problem, get a small section of hose to connect to the spout of the bottle and then run the other end into the differential and squeeze. Wondering what weight oil and how much? In other words, add fluid while parked on a level surface until it begins to run out. If your lucky yours will have one. Rear axle additives are designed for use in limited slip differentials which are normally installed in cars.
Slip the tube of grease into the hand pump with the nozzle end facing forward. Its designed to get you and keep you from getting stuck, not for performance at 60mph like you would need in a Corvette. I find using straight gear lube with a bottle of motorcraft friction modifier to work best. I'm at 40k in not quite 2 years Just a good opportunity to help out someone else? The owners manual say 75W-90 gear oil, but I've also used 80W-90, and 85W-140, depending on how hard it driven with no problems. Add only enough fluid to reach the proper level.
I really don't see the big deal with overfilling the fluid. If leakage exists, correct it. Now it's time to fill the differential with new lube. My 02 has one but a friend of mine bought his truck 6 months later and it has the same options but no drain plug. It will hold about 2. With engine automatic transmission operating temperature, shift through all gears. Changing break fluid in Chevrolet Silverado 1999 is also is a simple task.
The pump shown here is actually designed for a boat's lower unit, but works just fine. From there on, I follow a normal interval. Install the cover and gasket. My 2000 with the 3. I struggled for several hours trying to remove the fill plug drilling, chiseling, hammering, etc. Remove the hand pump and replace the top fill cap with your socket set. Hand pumps vary, but many are similar in use to a caulking gun.
Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job to put it simple if its a locker mechanical use straight gear lube in the weight manufacterer recommends or aftermarket carrier recommends. A bolt thread will leak. The differential on your Chevy works in conjunction with your transmission to turn your wheels. Tightening torque is 24 Nm. If the air conditioning system in your vehicle needs refrigerant, be sure the proper refrigerant is used.
There is no need to swap to a thicker oil, if there is a real problem the dealer needs to fix it. At 1,200, hardly a spec. It is a design characteristic of these steel clutch plates to exhibit more clutch chatter than other models. What dealer did you take it to? Remove the bolts that hold the cover in place. I have torn G80s apart that have grenaded and, other than the engagement pawl that forces the clutches together; there is not one gear-on-gear or tooth-on-tooth direct drive link in them. I was looking between 2 different brands: mobil 1 synthetic, and valvoline synthetic. This condition would be noticed in parking lot maneuvers, turning, or during locking differential engagement and may be more noticeable when the differential is hot.
I did mine at 600 miles and again at 1,200 miles. After refill check oil level. The rear differential started leaking oil. I am sure that the owner's manual and the Helm aren't wrong and you aren't in danger of underlubricatating but I feel that if it is going to leak overfilling the diff won't be the cause. The use of any additive in locking rear axles G80 is not recommended.
I have a 1999 jeep grand Cherokee limited V6. Transmission must not be in fail-safe mode. Amazed how good it works in the snow,and gravel hillclimbing. My 02 has one but a friend of mine bought his truck 6 months later and it has the same options but no drain plug. My owner manual and the Helm shop manual both suggest 2 quarts.
Some folks have commented that if you don't keep the fluid low, the excess will be forced out the vent tube. The rear differential oil capacity is 1,5 litres. Add only enough fluid to reach the proper level. The seal had been stripped away and the bolt wouldn't set back in. All of the axles undergo the same process to replace the differential fluid, only the fluid capacities change. I fill mine all the way up and just wrap the plug with teflon tape.