Rear diff fluid change

Edelman13 · May 15, 2016

How often should I do it? First new truck, my old man said he has never done one and has had countless Chevys and one F250 right now. He has never had a problem with the rear diff. Just thought I'd ask here.. Thanks

2015 Chevy LT 1500 5.3/3.42 2WD

Sent from my iPhone using Tapatalk

Janster · May 15, 2016

How often should I do it? First new truck, my old man said he has never done one and has had countless Chevys and one F250 right now. He has never had a problem with the rear diff. Just thought I'd ask here.. Thanks

2015 Chevy LT 1500 5.3/3.42 2WD

Sent from my iPhone using Tapatalk

What does your owners manual recommend? This is my first GMC (Canyon) but I've had a couple Toyota trucks and several jeeps. The Toyota recommended changing it at 30K miles.

Oil is what lubricates your gears, bearings, and whatever other internals lie within. Oil assists to dissipate the heat that is generated within the diff. If the oil breaks down - there's less lubrication and less to dissipate the heat. Chances are...by the time you 'notice' a problem, it's too late.

What can happen? Seals will fail.... If you don't notice the seals leaking....then all the oil will leak out. Worse case scenario?? Hahahaa...let me tell you a story (true) - shortened. Let's just say.....we were traveling in a group on a highway trip (not my truck, THANK GOD). While moving at 60mph, the entire axle shaft (with wheel attached) came flying out and rolled across the highway. After pulling over - the drum & brake parts were just about gone. The whole hub/axle tube weren't recognizable due to the heat that was generated - deformed the parts. The axle tube/suspension dug a hole in the pavement. The diff was so hot you couldn't put your hand on it (steaming, literally).

Trucks these days have complicated diffs with various traction devices & such. You need to take care of them because they're a lot more expensive to replace now-a-days than they were even 10 years ago.

Cowpie · May 16, 2016

I have always dropped the factory fill fluids from all the drive train within the first 5000-6000 miles and refilled. Just me. But looking at the magnetic drain plugs on them when I did it told the story. Especially transfer case plugs. On my 2013 1500 and my 2015 2500, the plugs looked like my cat had stuck his tail in a light socket with all the metal filings on them. It was so pronounced on my 2013, that I did it again about 10,000 miles later just to see what it looked like. Was normal at that point. So the amount of initial break in wear metals is very pronounced in these pickups. Do what feels best and fits your comfort level. It is an easy job to do them and not really expensive. Of course, the OP will not have the transfer case thing going on, but doing a rear diff is easy, quick, and worth it.

Edelman13 · May 16, 2016

Thanks for the input. Looks like I am about due for a change then. Thanks again!

Sent from my iPhone using Tapatalk

crankman · May 17, 2016

Follow the owners manual and if you tow a lot bump it up to the severe use time. But there isnt nothing wrong with changing it earlier if it makes you feel comfortable.Oil is cheap compared to repairs.

Cowpie · June 7, 2016

yeah, people will spend more on going out for pizza on a Saturday night than it costs to do a diff fluid change. If one is considering doing it, then just do it.

Z45 · June 7, 2016

Keep in mind the factory fluids are from a low bidder. Differentials/transfer cases/engine usually come from the manufacture (outside source) already filled with fluids. so who knows what they used to lower their cost. The first 500 miles are hard on the differential, they generate a lot of heat and cheap fluids can be used up real fast.

While it may be good enough for GM, all they really care is that is lasts through the warranty period, after that is your problem.