 Well, good morning from Arizona Transmission and Engine Exchange. This is going to be part two of the video. It's not a how to build a transmission step by step, but it is the, you know, it's just a little bit more information because a lot of times people just drop these things off and then magically they think like a genie just comes and fixes everything. So this is the reassembly of the Allison MT643 for my bus, which still doesn't have a name. Right now, let's jump into the build and then I'll show you a dyno testing of it. AT545, flex plate, this is the flex plate adapter, this is the adapter ring that spaces it from AT545 to the larger bow housing of the engine that's going to be standard size for the MT643 and then this is your adapter ring that gets bolted to the torque converter and then we're going to go over here. This is going to be the new adaptions. This is the spacer plate that's going to go bolted to the bow housing of the engine. This is your new flex plate with the ring gear spacer center adapter and new adapter plate, flex plate is called with the new bolts. So this is AT545 that's getting removed parts. This is your MT643 parts that are getting installed. Here it gets torqued down to 25 foot pounds, assembling the pump, which is already piston jig, gasket air, assembly, main shaft, assembled everything here, going to get some assembly grease for the output shaft here, hold the gears on, bushings installed, grease installed. You have to get this pin lined up with this hole, this is the loop hole. Get the assembly loop and like this, given the snap ring, let's see if I get it right at the first practice. Towards the piston, backing plate is the back side of the assembly, but still the thin part goes towards the piston because of the weight and the temperature that the transmission functions on. That is the design by Allison Transmitters. Oh I see, so those teeth feed right into the other ones there. Yeah. Snap ring popping out. I've got my guide pins here for my pump to go down center. Okay. Uh oh. The sixth clock to me, that's how I know where I'm going to be at with it, that goes around here. Nice. We're doing here 40 foot pounds. Something to keep in mind if you guys try this at home is that you will need to cut your exhaust pipe depending on your engine. So if you can see that, that exhaust pipe is cut right there. The transmission is spinning? Yes. Okay. It's like when you're in shifting performance. What the engine would be idling at, the transmission dyno just got done, dyno testing, the MT643, it was going to be between 160, 180 depending on your climate that you're in. But 120 is good for dyno testing. We still had strong pressures, 200, 280 main, lockup pressures are excellent. On the transmission casing or anything like that, you just got to go over it, all the check sometimes. Casing's can have porous holes inside them and then it will leak out transmission fluid but that's why you get them operating temperature. But other than that, we've pretty much got a complete dyno test. All pressures are good. The points were good. Overset. It has been a week later. Welcome back to the show. I need to clean off. Incredibly sick. I've never been so sick before in my life. Got the worst flu. So if you guys caught that, I sympathize with you. I know what that's like. It's not awesome. All right. So the remaining parts, let me just get up to speed where we are with this video. The transmission has been installed. Nice and pretty. I just went to pick up the drive shaft. It's over there. I'll show you in a second. These hoses I picked up a week ago when I was, before I got sick, we got all the parts to put everything back together. The guys are going to run cooler lines back to the transmission, hook everything up, put the filter and filter head back on, fill the system back up with transmission oil. Then it should be good. Here's what it looks like when you get modified drive shafts back from a good drive shaft shop. These have been all power washed, steam cleaned. I have new carrier bearings, new grease, new U-joints, and everything's been painted with a very nice epoxy. These are brand new. So this alone here was about $550. The cooler lines were about $330. So if anybody thinks, oh, this is no big deal, it is. Because we're modifying, we are changing things, and anytime you do that, it costs money. Now the transmission, I was quoted $16, $17, but there has been more modifications, things like that. So if the price jumps up, that's why. The only remaining thing that I have to do is to change the exhaust, because it was cut right there, and I have to match it up to the part in the front, up top, coming out of the turbo. The reason is the bigger transmission, there was less space next to it. I have no idea how much that's going to cost. I would have estimated about $200, so everything would be, even if you get yourself a good used transmission or someone just drops it off at your house magically, it falls from the sky. You're looking at $1,200-ish in modifications to make this work. Now for those wondering why we cut the exhaust, the reason is this right here, this black thing in between the bell housing, the blue part, and the silver part, the transmission, is a transmission adapter? And so we basically had to use that because a torque converter stuck out far out of the transmission, and so there was not enough room, previously the downpipe exhaust came down here with no problem, now it's in the way, the transmission is in the way, so Richard wanted me to mention that, and that is the reason why we had to cut it, that is a reason, also a reason we had to shorten the drive shaft, because this transmission is just a little bit long. Alright, we are now going for a test ride in the new MT643 transmission installed by Richard, and done that a bunch of times, lost a few of those. So we don't have a downpipe, we're going to get that replaced tomorrow, but Richard made some adjustments to the valve body, just going to do a basic test drive around the block, since we ain't got a full exhaust, don't want to get none of the firewall or anything up for temp, but just do a basic test one for now, check shift points, and what are you going to be looking for on this test drive? I'm going to be just checking the shift point RPMs under partial throttle and full throttle, and see how everything is shifting smooth, and just take it for a run. Alright, it has lock up torque converter, so correct me if I'm wrong Richard, but that means it is a one to one ratio once you get into third and fourth gear, right? That means more of the, it does sound kind of like a hot rod right now, it shifts great, shifts much much better than my last bus, well, last transmission. So we completed a test drive, the partial upshifts were excellent, under partial was about 22, 2000 under normal upshifts partial, full throttle upshifts, first to second, we were right at 2400, second to third, we were right at 24, 23, and then lock up came in at 23, and then fourth came in right at about 23, 2400, which is good, I'd like to see a little bit, maybe 100 RPM a little higher, but then you have to go in and recalibrate the valve body, but as long as the owner is good with that, then we're good, I think the transmission shifted excellent under partial and full throttle, yeah, alright, and owners good with that, so that's what I think you guys are watching, I want to thank Richard at Arizona Transmission and Engine Exchange, if you guys are in the Tucson area, come on by, he'll take care of you, he's a great, very talented, honest mechanic, and if you guys want to upgrade a transmission, you can, he definitely knows how to do that, like I said before, you don't really need to, if you have lots of money to throw around and waste, then, or if you can find a good used one, go ahead, but it's not necessary, but, you know, if you're gonna have to rebuild something, then of course, you know, you can make that decision when possible, so it's a very important video, Badge wanted me to mention, for any RV person or school bus person with an Allison transmission, there's a wealth of knowledge in the previous video, in this video, so lots of do's and don'ts, you can see why not to slam it in from reverse to drive, as Richard said, there's a lot of good information, what bad transmission fluid looks like, so if you haven't seen that video, it is the previous video to this, so, thanks again. Thank you, Jack, for the opportunity to do the bus conversion from you, from an AT545 to an MT643, and one thing I strive for is 100% customer satisfaction here at Arizona Transmission and Engine Exchange, so if anybody out there needs Allison transmission work or even auto motor work, please stop by, get your check and care of it, aztranny.com, thank you.