This Is What Happens If You NEVER CHANGE YOUR DIFFERENTIAL OIL!!

what do you get when you cross your rear two wheels with your driveshaft your differential and this is what happens when you don't change that oil many of you like me drive older vehicles with say a hundred thousand miles or more on the clock and many of you like me have never gone out into the garage and said I know what I'm gonna do today I'm gonna change my rear differential oil yeah it just doesn't happen like never well never say never because every given day is an opportunity to turn it all around or at the very least to change your dip fluid and that is precisely what I'm going to do today like right now I'm going to change the dip fluid I'm working on my 1995 GMC Suburban this thing's got the 10 bolt eight point five inch GM Locker in it and I'm pretty sure that the fluid has never been changed this is stock from the factory this vehicle only has about 78,000 miles on it so I'm not expecting anything crazy like parts to be falling out when I remove that rear diff cover but you never know alright so the first thing on the list is to go ahead and jack up this vehicle and put it up on jack stands and I'm gonna put these jack stands on the actual frame of the truck the goal here is to drop that rear end down as low as it'll go now that I have it nicely supported with two 6-ton jack stands I also grabbed a set of three ton jack stands for backup next I'm using my half inch ratchet with an adapter down to three-eighths and an extension I'm gonna use this to go ahead and loosen this fill plug hole before I take off the rear diff cover this way we know that that thing is not locked in there and we can actually refill it after we remove the old fluid now before we jacked up this vehicle that rear differential was tucked way up in there that rear gas tank is roughly 43 gallons and it is definitely in the way so jacking that vehicle up putting it up on jack stands and letting that rear diff hang as low as it can he's a great way to gain some extra room I'm gonna go ahead and take my 3/8 inch ratchet and a 13 millimeter socket and just start removing the bolts I've chosen to remove all of the bolts except for the very top center bolt I've also chosen to take a piece of cardboard and basically map out where these bolts go so that I can be sure to put the same bolt back in the same hole now we get to the fun part all of the bolts are removed except for that top Center bolt which is loose and we're gonna go ahead and take our old crusty Harbor Freight screwdriver and oh man look at this old nasty diff fluid boy am I glad that I'm getting this stuff swapped out this stuff looks burnt to a crisp look at how dark that is yuck I would not want to rely too much longer on this old fluid keep in mind guys this vehicle only has 78,000 miles yes it is very very old but 78,000 miles this fluid is pretty dark make sure you have a drain bucket to catch this nasty fluid and even some plastic under that just in case and here is the top bolt you can see we left in so that this rear diff cover would not fall as we crack this sucker open now that all that fluid is drained out I'm gonna go ahead and remove that top bolt I'm gonna apply pressure to the cover so that it doesn't fall and by hand just remove the bolt then we'll pull that cover off and reveal the differential Wow and it is pretty black from this fluid here you can see the rear diff cover and especially that magnet boy are those magnets needed here more than ever before look at all of the metal shavings on this magnet it's incredible how much metal shavings build up on this thing this is a testament as to why you need to swap your rear differential oil per the manufacturers recommendations I believe on this GM truck and most of the GM trucks that carry the same rear end it is recommended at the first thirty thousand miles and that is because when you first start driving your brand-new vehicle these gears need a chance to break in and during that break-in process well yeah there's a lot of metal that comes off these things so swapping out your rear diff fluid at about 30,000 miles is extremely important this one unfortunately has never been swapped but hey I think everything looks pretty normal here so I'm in the clear further evidence for having never been changed this is the original GM differential gasket all in all not bad for being twenty four years old we need to clean this thing out so the first thing I'm going to do is throw on some rubber gloves and start wiping it down with an old rag man look at the metal shavings that came off that magnet I'm just gonna do my best here and get as much metal off of this magnet as I can you can see with just a couple swipes of an old rag the inside of this diff cover is actually coming pretty clean now I'm gonna take this putty knife and very carefully begin the process of removing this old gasket and Wow it seems to actually be coming off very easily you want to make sure that you're not scraping or scratching into the diff cover because you don't want to leave any marks or scarring anything like that could lead to leaks in the future here the old gasket has been completely removed but as you can see we still have a lot of work to do on the gasket surface and if we take our original GM gasket and lay it on top of our brand new fel-pro gasket you can see that the holes line up perfectly I'll put a link down in the description below this video for this exact gasket the first part of the process in preparing this diff cover gasket surface is to take a razor blade and try to scrape off any remaining gasket material now that you have that as clean as possible with the razor blade I'm gonna take this 3m very fine sanding pad and basically buff down this surface to nice shiny metal now to go over the top and to get it extremely clean I'm gonna take this brake parts cleaner and spray out the whole inside of this diff cover as well as the gasket mating surface you most likely do not need to do this but hey if you have the brake parts cleaner why not now I mentioned how dirty the inside of this differential was and you saw it it's completely black burnt and caked on old diff fluid so I'm even gonna take this brake cleaner and spray that out next we need to replace this diff cover the easiest way I found is by using the top-center bolt to not only keep that gasket in place but also just to start that sucker and get this thing hanging now for me I'm gonna go ahead and throw on some blue thread Locker on each one of the Boltz this will give me just a little peace of mind that these bolts aren't going to come loose in any way definitely make sure you hand start and hand tighten each one of these bolts before cranking on them with a ratchet after hand tightening I'm going around with my torque wrench and torquing each one of the bolts to 10 foot pounds this is just the first pass after that I'm gonna go around him again and now tighten them to 30 foot-pounds now that the diff covers on we can work on refilling this differential now you may not have to do this but I'm using my vacuum here right alongside this plug as I remove it just for a little extra insurance that none of this crud is gonna fall down inside that hole when I take this plug out now as for the Lube the manufacturer calls for gl-5 80 W 90 but I found this awesome Lucas fully synthetic 75 W 90 and it is gl-5 rated and I'm going to go ahead and use this you can see what I've come up with here to make the job of refilling this thing a little easier by using a little bit of this clear hose I can raise the bottle up even higher and squeeze it with both hands and make sure that nothing spills man after that first bottle my arms were tired so here is another added benefit of using this hose I went ahead and jammed the bottle up in between this exhaust hanger and the frame then I made a cut in the top of the bottle to allow air in now I'm just gonna go ahead and let gravity do the work for me as for capacity this differential uses roughly just under two and a half quarts you'll know it's full when it actually starts leaking back out the bottom of this fill hole is actually the fill line too so as you can see once it starts dripping back out you'll know it's completely full now take your plug and replace it alright guys we did it we did it together this was my first time ever changing out differential fluid hopefully I won't have to worry about this for a long time to come just make sure you keep an eye for any leaks or anything like that you may need to Snug those bolts down if you do see some leaks also it is possible that your differential needs an additive so definitely check with your manufacturer for that alright guys I really hope this video helped you out if it did make sure you leave a comment below hit the thumbs up and also subscribe if you're not already you can find me on instagram at one road garage and my website one road garage com thanks again guys for watching I know your time is valuable my name is Jimmy this is one road and I will see you in the next one

Channel: 1ROAD

Views: 2,955,730

Rating: 4.7674527 out of 5

Keywords: Differential oil, how to change differential oil, diff fluid, diff fluid change, gm 10 bolt, gm 8.5, gm axle, gm rear differential, rear differential oil change, differential fluid change, GMC, Chevy, Truck, Car, rear axle, how to, automotive, GM locker, 80w-90, Lucas Synthetic 75w-90, diff cover

Id: fTFrTNvxgfE

Length: 9min 13sec (553 seconds)

Published: Sun Mar 24 2019