 Good morning guys from Tucson. I'm at Arizona Transmission and Engine Exchange. That's a tongue twister. Today we're going to see a teardown of the new MT643 with Christian and Richard. And I don't want to sound the alarm. Nobody needs to replace their AT545 unless you have an issue with it. So I'm only doing this because there's an issue with my transmission. There's a lot of brass in the pan and that is no good. Here is the transmission I got. This is a used MT643 and I have no idea what the condition inside of it is. And that's why these guys are here to tear it apart. So, let it rip. That's a torque converter. I'm going to take it apart and see how it looks inside. First the demonstration is when we slide the torque converter on, it's a slide on and off torque converter. We slide this off for inspections as we go through the model. So the main portion we're going to look at is here is this hub right here. So this hub is worn down and will need replaced. In the bushing area, if you feel the diameter is worn out, it's dipped down. Yep. Yeah, I can feel that. Very slightly. But that is beyond specs, so it will have to be replaced this hub. Okay. And so if I was driving this and I had an issue and this was the problem, what would that be called? It would be a front end leak, which would start to leak out the front end and this rides on the pump bushing area. Interesting. Okay. So this splines into your oil pump. This is your pump bushing area, which gets worn out under just high mileage transmission wear. Okay. Would that be a slipping part of something, or is that further inside? That's further in. Clutches are further in. Okay, perfect. That's one point there. Right here we're opening the torque converter for inspection of components. Lock up clutch. And this oil looks pretty dark, right? Is that correct? Oil is burnt. Burnt? Yes. It is dark and burnt, which means it's going to have clutch material, probably bad. And so is there any way to know without taking one apart if one is good or bad? I mean, if someone had one that was messed up and they just did a fresh oil change, would you be able to tell that without driving it that it was in bad shape on the inside? No. Interesting. So opening up here is the lock up clutch. This is your lock up clutch, which is worn out. It is. You can tell it right here. Oh, yes. Yeah, there is some damage right there. Yeah. It's coming off. Yep. Hardly no material left. And would this be metallic material that would stick to the magnet? Yes. Okay. And metallic, if you look at the oil, the metallic portion of it. This is all friction material coming off there. Okay. So as we go through the hard parts, which is the backing plate, lock up piston, which the lock up piston looks like it's cracked, which will need replaced. If you see this line right here. Oh, yes. They cracked through there, and then they bleed off pressure. Oh, yeah, I see that. I see that, yes. And that's your lock up piston. Okay. For the lock up torque converter. All the way around, all the way through here. Okay. So that whole part is going to be... So that piston will get replaced also. Okay. And it needs pressure through there. Now your clutch is not applying correctly. Okay. That's what will burn up a clutch. That's all the material that is coming out of that. Oh, yeah. Look at that. Wow. It looked like my shake this morning. Shit. Oil pump and the forward housing is going to come out all together as one assembly. We're going to set it to the side for inspection. Assembly, all complete. We will disassemble, disassembly at the later point in time. We're going to open the oil pump. Okay. So we'll remove all the bolts and open it up for inspection. All this black right here is clutch material. All right. So definitely some wear and tear in this one. Yes. What are we looking at? Okay. So when we open the oil pump, we're inspecting the pump for excessive wear on the housing. This is the front support. Looks very good condition. We will pull the gears out of here and set them aside, inspect down in here, and look for edges on the side right here. Now looking at it, it looks very good condition. Good. The oil pump is very good condition. There's no sharp lips, no excessive wear, metal gone from anything. Okay. So that's a good thing, right? Yeah. That's probably an expensive part too. Yes, it is. Good. Every time you say, oh, that's going to need to be replaced, I hear a chaching in my head. Yeah. We're going to check here the seal ring areas on the forward clutch housing. Down here is the seal ring areas and the bearing area here to see if it's got any damage. Looks very well. The input shaft gets a little bit of wear just from bushing, but it's not damaged. Awesome. A little disassembly of the forward clutches for inspection of the forward clutches that get replaced anyhow. But we're checking all major hard parts. What we're checking here is we're going to be replacing all the clutches so they get replaced anyhow, but you can see that the darkness of the steels are discolored that they're burning. Okay. And that would be the burning smell when you're operating it. Yes. Okay. And some of these look smooth. Are they totally smooth because they're worn down? Yes. When they get smooth, they're supposed to have high ridges. When they get worn down, then they'll be almost flush. Like that one, huh? Yeah. Well, this is the metal. Oh, that's a steel. Oh, okay. This is your friction, which people consider a clutch, but it's the friction. Okay. Forward and forward clutches use the same diameter and same style friction. That's what we go for. Awesome. Here we go. And just for reference, this is my current AT545, and this is the larger 643. Slightly, slightly larger internals, as you can see. Inside here is a lot of metal from the clutch wear material. Down here, all the clutch material gets built up. Oh, wow. This is all your friction material that is built up in the housing. So that's an indication of wear? Yes. Okay. Yeah. High mileage, just normal wear and tear on the transmission under normal circumstances. If your linkage shifter linkage gets out of adjustment, which is very important because if it gets out of adjustment, worn down, it will burn your clutches up very fast because it's not in the detent all the way. Gotcha. We're done with disassembly of that. Okay. The piston will come out later for inspection and rebuild, but we'll continue on with our disassembly. Okay. So we're forwarding on to taking out the forward, fourth clutch housing, and this is third clutch snap ring. So we'll set that to size. We're going to go in here, grab fourth clutch housing, slide it out slowly because of very sharp objects. One of the important things we're going to look at is the main housing here. The main housing looks very good condition. Good. Otherwise, it would chatter and wear between there. And what happens is third clutch will not slide smoothly and grab and slip and cause more damage and clutch failure. Another thing here is another seal ring area. Very good condition. So this fourth clutch housing looks good so far. We're going to be removing frictions out of it internally there. Disassembling fourth clutch, fourth clutch vacuum plate, steels, frictions. Same with these. These are not completely burnt, but do have high mileage wear and tear on them. This one here, you can see it's cooked. I mean cooked, it's just starting to flake apart. Mm-hmm. That one's gone, see? Oh, yeah. That one's really smooth. See, that's a lot of times you could look at all these and it all looks good. You flip them over, they're coming apart or gone. It looks like sandpaper right now. Yes. Mm-hmm. Which all these get replaced on rebuilt any house. Third clutch, frictions and steel, they are burnt down metal to metal. Wow. Nothing left of the friction. So can you reuse the steel? No. No. So all of them need to get replaced? Yes, even the backing plate. Wow. The backing plate is the thick component. Look at this side, it's smooth. This side, it is completely worn out like a clutch disc. You know, it looks like disc brakes. Yes. You can see the grease. Yes, that's how exactly it is. Look at that clutch. That third clutch, completely gone. This transmission was slipping. So a third gear was slipping? Yes. The patient of you're having clutch or metal damaged internally when you take out the speedometer sensor and it has tons of metal on it. Wow. So if someone, so... If someone is replacing their speedometer sensor and seeing all this metal internally then they have wear and tear going on. They need to get the transmission repaired before they end up stranded somewhere in the middle of nowhere after their travelers. So would it be advisable to, if you were inspecting a new vehicle or, sorry, a used vehicle or a used transmission, if you pop this thing off and it's dirty, is that a good indication without stripping this thing down that it's screwed? Yes. Okay, good to know. We're taking the dust cover off and then we're going to pop the output seal off. At this point in time it just makes it easier to remove the seal. The output shaft, output bearing internally so far looks everything... We are removing the governor and we're going to be pulling the governor out. And that's the thing that regulates the RPMs? This is what makes your transmission upshift. If a person has a problem with an AT545 or an MT643 that quits upshifting or starts to upshift late in problems, this could be one of your main problems here. The gear gets worn out, the surface here gets worn out. Sometimes when there's tons of metal going on, then inside the bore gets worn out. And this is governor pressure as the weights move back and forth makes the valve body shift make sure transmission upshift. If the gear strips out completely, it will not upshift anymore. So we pulled the rear cover off. This is your output housing. This is your first clutch piston. And you just mainly inspect it, make sure there's no major damage going on. Sometimes the retainer will crack in half. This will come apart. The springs will fly in there and then you'll get metal throughout the whole back end which would be another major failure of the transmission. Okay, right here we're going to just slide the spacer. This is your speedometer gear with electronic. And your governor gear right here, they just come off the output shaft. We're going to just take those off, set them aside. Then we'll be pulling the planetary section out with the first clutch. Right here is your first clutch assembly. It means the clutches were slipping also. Dark means high heat. High temperature, yes. These are all frictions that get replaced on rebuild anyhow just as a demonstration of the clutch first clutch. So there's definitely some whatever vehicle came off of there's some intense heat in first gear. Well, the whole transmission is showing high mileage wear and tear. So it's not something specific that just burnt up a specific clutch. The whole transmission has high mileage wear and tear on it. Okay, so the housing has some wear on the back area. It gets stuck in there because it's just wear and tear. This is your first clutch backing plate. Still reusable, it's not worn down. So it's a good. Now we're pulling out the planetary section of the transmission. On this assembly, the main components that we'll be looking at for damage, hard part damage, is the spline area here which is starting to show a little bit of wear and tear. But still okay. Thrust washers good. Here's are still good. If you look down in here, it still looks good there. The planetary gears and thrust washers internally. This is your front planetary. Another important area here, this is the main shaft bushing area. Even though it shows a little bit of wear, the main shaft is still good condition to reuse. It will be polished up here. If it was worn down beyond specs, then it would get replaced. See the darkness that's starting to go on? This is just because the high mileage person doesn't replace their fluid when it should be. So the fluid gets very dark and stains it. Yes, it goes through the whole transmission. Interesting. That's your center planetary. It gets inspected for thrust washer play. If any thrust washers are missing, then this planetary gets replaced. Old times the planetary would get rebuilt, but due to cost nowadays it just gets replaced as an assembly. This other area here is bushing area for the bottom main shaft. It's good condition. And then one more area right here where the pilot bearing goes. That is good condition. The gear is good. This assembly is good. The planetary housing here that gets all your planetaries assembled. Everything looks good condition. The splines are good. They're not worn out internally. Other times they get worn like that. All this section and we check right here. The thrust washers, any missing? The thrust washers are there. If the gear slides up and down excessively, that means your thrust washer is gone either on the top or the bottom. But this is still good condition. We're going to pull out the sun shaft, which the main shaft goes through for inspection on other bushing areas. The thrust washer, center sun gear. Right here is bushing right areas. And these are the inside bushings for the sun shaft, which go on the main shaft. Everything looks in very good condition. Now to complete the disassembly, we're going to have to take the valve body off. So we've got to remove the oil pan to remove the complete valve body to get to the center support bolt and finish disassembly of the transmission MT643. So here we are, we removed the oil pan for further inspection. We know we have lots of clutch wear already. If you're going to do a normal filter oil change on it, if you remove your pan and you see this black material that your clutch is worn out and the transmission will be failing soon. Sooner than later. So we're here to the valve body and we're going to be pulling the whole body section off so we can get to the center support bolt and finish disassembly. The valve body, this is your whole valve body section here, this is your channel plate and as you can see all the black material which is clutch material just transmission high mileage and worn out, ready for rebuild. Alright. So is this thing fully disassembled then? No. Okay, one more thing. We're going to take the center support bolt which is here. Sometimes the center support bolt will snap, break because of just normal wear and tear or driver abuse depending on if they're going from reverse to dry without stopping the vehicle. The vehicle is very heavy. So when it impacts it, it moves the center support and abruptly breaks the bolt. If it breaks the bolt then the center support is not held to the main housing firmly and the pressure is bleed off internally and will burn your fourth and forward clutches up you know, immediately. It won't last long enough. Oh, okay. So that one came out just fine. Yeah. Cool. The center support didn't fall. The center support pistons, all the seals get replaced. The center support pistons is the tops, these pins break and doesn't hold the retainer down anymore so this would have to get replaced and this one is in good condition. This is washed up. Here is a sealing area right here where your sealings go. This is where your fourth clutch housing goes on to here and it gets applied through these pressure ports here. So, we got one more clutch to take out. The second clutch, Allison transmission. The greatest transmission in the world. You like it? Yes. This is 1994. I got the opportunity to go to work at Phoenix, Arizona training. First started out mopping the floor and turning the transmissions apart and I got to see the first transmissions being designed at Allison and Indianapolis. They sent me to school there and anybody wants to do it. Cool. Let's see how wonderful that one looks. Looks like grip tape on a skateboard. Totally smooth, huh? About to cut off all the teeth, almost. Wow. Great disassembly. MT643. Alright. Anything else? Now, inside the main case, we're going to go look right here and then down in here where the clutch is right, there's very little bit of wear you can see on the edge here. Down in there were first clutches. Many times the snap ring, the housing and then the snap ring will pop out. But everything, even though the transmission shows high mileage wear and tear on all the clutches, the main housing is in very good condition internally. And you just see all the clutch material laying in there. What are these scuff marks right here? Right here is machining from the factory. Okay. When they mold the case, they have to machine this out and get the burrs off for the components to go in. Okay. Interesting. So, we're looking good. Yes. Awesome. The case is good. Okay. So, now having taken this thing apart, what are you going to order? What's the diagnosis on this thing? So, this is typically, like every transmission that we rebuild gets all the clutches replaced. If the steels are bad, if they're good, we can reuse steels if they're in great condition. If they're bad, we replace them. So, it's going to get a complete seal and gasket kit, another lock-up friction, a lock-up piston, and every single clutch and steel inside this transmission and filter kit. Alright. We look brand new. Cool. So, if anybody's in the Tucson, Phoenix, Arizona area, how did they get in touch with you to rebuild? Well, we're located at Arizona Transmission and Engine Exchange, and our phone number is 520-295-1392. We have very, very competitive pricing, and we guarantee our transmission is 100% warranty. Awesome. For two years, right? Yes. Two-year warranty. On our automotive, we do automotive also. Okay. Automotive analysis. Awesome. Unlimited mileage. How long will... We're going to come back for the rebuild part. Will that take a day, two days? On a typical build, replacing all the bushings, clutches, pistons, seals, about a day and a half, two days tops, just depending on the washing of the components. Okay. Awesome. There we go. Alright, guys. We're going to check back in with Richard next week. And Christian. And Christian. Thank you so much, guys, for explaining what most people don't get to see when they drop off their transmission and, you know, what goes on in the inner workings of this thing. So thank you very much. Thank you. Here we are with the... going to be the overhaul kit for the MT643 Allison transmission. All brand new, genuine Allison components. Got the seal and gasket kit here with all your necessary components. Seals, gaskets, output shaft seals, pump seals, for converter, for converter shims, your stator springs here, and all, like I said, genuine Allison parts here for a complete MT643 rebuild. And so, right here is your fork and forward clutches. Wow. That's a big difference. And this is a big difference if you look at the ones that we took out of the transmission compared to the brand new. I mean, even the color alone is just completely different. The teeth look a lot newer and there's no smooth parts. Yeah, even I've seen transmissions come in that the linkage might have got out of adjustment and burned up a specific clutch. We've disassembled them before and the clutches looked fairly, fairly good condition to as new, which that's how they should be under normal fluid interval changes and so forth. There's the other clutch pack completed as you can see again. The design, color, the internal teeth, great condition. And that's why we give two-year warranty unlimited mileage. All right, awesome. And these are some of the parts that we'll be assembling when we rebuild the transmission. Next week. Yes. All right, cool. Well, I'll see you then. See you then. All right.