 Earl Glant township Chevrolet on the shop form in here, and we're just going to go over Differentials and transfer cases today both kind of do the same kind of function or have the same Type of function, but they kind of do two different things in the vehicle. So we're kind of run through those so the differential This part here. We're underneath the three-quarter ton truck What it's going to do is the drive shaft comes from the engine and the differential job is to take that Rotation that's go that's traveling down the car and run it both ways out to the wheels So that's one function the next is to increase torque or rpm or speed of the Vehicle take that rotation that's spinning a certain rpm and multiply it out to the wheels And that's done through the gear set that's inside of here The next function is to when you're taking corners and you're turning One wheel needs to spin slower than the other the outside wheel needs to spin faster to keep up So that's the some of the parts inside of there do that the transfer case Normally found an all-wheel drive or four-wheel drive cars that also does the same thing There's also usually a low and a high feature on that. That's also going to multiply torque Raise the RPM of the engine to get out of situations where you may be stuck or maybe find with the hill or something like that and also It's to take the same rotation that's traveling back to this back differential Turn it around and head towards the front for the front wheels. So They kind of do the same function the same way Because of There's fluid in this differential and because of the jobs that it has there's different parts in there There's obviously metal on metal gears and contact air which causes pressure You've got a lot of when this thing's traveling in the highway You've got a lot of a fluid shear or fluid moving around inside this this small pop here There's not very much fluid typically in one of these anywhere from a liter to four liters roughly So that generates heat. There's no cooler on this unit So it just dissipates the heat through the metal parts So the heat generating after a while will break down the viscosity of the fluid and you've also got temperature Which is a big thing around here with the influx of high and low on the temperature I can cause condensation or if you're someone who is driving in some real Extreme conditions like in heavy water or something you can also have there's a vent on these as well to vent that pressure That builds and it can also get water and moisture in there as well So because of those reasons these need to be changed now different driving styles and depending on how you drive your vehicle You know will kind of determine whether or not you need it done But the recommendation normally is around the 30 40 50,000 kilometer mark depending on how you're driving and what you're doing Transfer cases It's typically the same kind of thing the old transfer cases used to be strictly gear on gear Which is obviously cause would cause heat And the fluid would break down in viscosity and you can obviously a condensation in there as well The big difference with the newer transfer cases is there's a lot of clutches in there now Especially when you're dealing with the auto-fuel drive that will apply or engage that transfer case and supply power To the front wheels a little more evenly so it's not so abrupt. It's not so hard So for that reason there are those need to be fluid needs to be changed in those as well because those clutch material obviously There's what the clutch is rubbing. There's going to be some material that comes off The fluid to get dirty Another thing to keep in mind too with the front differential on an all-wheel drive or foil drive is the same set up as this truck Here is in the back for the most part older trucks used to have locking wheel wheel hubs, so we were driving on the road with that style of vehicle The gears in here were normally stationary if you weren't in for a drive and you had your wheels unlocked your Your differential wasn't turned now Most vehicles today that differential is turning whether you're in for a driver or not So you may think oh my front differential. I don't use it very often for a drive very much But that's turning the whole every time the vehicle is moving down the road. It's turning as well So there is fluid shear In there which is going to cause heat which is going to break down the fluid after time So something else to think about Other than that it's a pretty quick thing to check you can see on this particular vehicle here There's this plug. There's one in the front in the rear our technicians here will pull that out and basically Dip their finger in or a screwdriver or something and pull out a small sample Which they can show you if you if you need us to show you guys what it looks like same thing on the transfer case It's just a it's a quick sample of the fluid Yeah, other than that For this to function properly clean food is very important those clutches that allow this thing to Turn corners and allow the wheels to spin at different Different speeds those can get clogged up. They can get dirty There's little fingers and cogs in there that lock that so you want those things to move freely and you want to be working Good so make some room for a service if you're driving a four-wheel drive vehicle or an all-wheel drive Or even a two-wheel drive truck that's gonna have this back here Get the guys to check the diff fluid for it We normally do it anyway, but just mention it if you want a sample of that Especially you get over the 40,000 kilometer mark and you never done it if you're dealing with a front-wheel drive vehicle there will be a Differential there as well. It's built into the transmission. So they call that unit a transaxle. That's where everything's built in Some vehicles or most vehicles I should say I guess share the transmission fluid does the transmission functions along with the differential There are some vehicles out there that have a separate fluid for that differential which can also be checked in the same manner as this as well so Yeah, so that's a quick rundown and transfer cases and and differentials any questions or comments just drop them down below and let me say any Any ideas what you guys want me to talk about in the next episode drop those in the comments and we look forward to seeing you guys Thank you