Jims Transmission Fat 5 Overview

Hi, I'm Bob LaRosa. Welcome to Fix My Hog. Today, we're gonna take a look at putting in JIMS Fat 5 Overdrive transmission. Although this is not a direct replacement for your soft tail, Dyna, or FL transmission case, JIMS has built it as a custom application. Simple reason being JIMS Fat 5 Overdrive trap door is 560/1000 thicker on the right side of the motorcycle. Everything else remains dimensionally correct. What you'll have to address when you're done installing this JIMS transmission, the complete assembly, you'll have to address any components that lie to the outside of the transmission clutch cover on the right side of the motorcycle. The cover that the cable enters into. You will have 560/1000 more hanging out the right side of the motorcycle. When it comes to strong, this is it. This JIMS Fat 5 Overdrive transmission set the standard for strength. Gears are typically 18% to 53% wider depending on the load that they have to carry in usage. The ratios, first gear is a nice close ratio of 2.91 as opposed to 3.21 in a stock transmission. The reason they're able to make the gears wider and stronger is JIMS shifter ring technology. It pretty much changed the industry as far as the shifter assemblies on the shafts. In this day and age, everyone is upgrading engines. It's pretty much the norm nowadays to find Harley-Davidson engines that are into the three digit range. There's 120, 131 and 135 inch. This basically doubles the stock horsepower. If it's 69 horsepower from the factory, roughly, we're gonna be into double that. You're gonna use a higher torque clutch assembly. You're gonna use a bigger, stickier rear tire. What is the weak link in between? The transmission. Not only the bearings, the shafts, but the gears. This transmission from JIMS has resolved that issue completely. Again, I'm gonna show how to install this. It is not listed as a direct bolt-in application. There is, and again, anytime you address something on your motorcycle that's this in depth, you have to be aware there is a little customization factor involved. Use your factory service manual. Make sure you review the instructions supplied by JIMS Manufacturing. They are very thorough. If you're not not comfortable doing this procedure, don't do it. Don't get yourself in trouble where a transmission can lock up or destroy your motorcycle because you did something wrong. This particular set, this transmission case set that we have is going into our 2005 Dyna. You're gonna remove the four retention rod allocation in the stock case. Again, I can't stress enough how strong this gearbox is. You need to use the correct fluid, but other than that it's just, it's nearly indestructible. Big wide gears. And once I get the stock gearbox out of this Dyna, I'm gonna put 'em side by side. You'll you'll see a noticeable difference between with and actually the position of the gears on the shafts. JIMS was creative enough to hide a pair of gears inside the trap door. Typically a stock Harley five-speed transmission, fifth gear is your 1:1 ratio. What they consider an overdrive. On this JIMS set up, fourth gear is a 1:1 ratio. Fifth gear drops to a 0.886 ratio, making it a true five speed but also a true overdrive. First thing we're gonna do. I want to review just a quick, quick look at what you'll need for specialty tools. You'll be able to take the motorcycle apart per the service manual, up to a certain point. Again, as with any procedure, work it out ahead work it in your head before you take something apart. Make sure you have every specialty tool. This is a pretty arduous process. You definitely have to do things correctly. When you're assembling anything, keep things spinning. If anything seems to bind, stop and address it then. Don't wait until everything's together and find out things aren't working correctly. To my left here you'll see there's a handful of JIMS Manufacturing tools that are needed to remove and install the stock gearbox and install JIMS Fat 5 Overdrive Same tools are typically used to remove a stock transmission and install a stock transmission. Same tools will be used for the Fat 5 Overdrive upgrade. I'm not gonna go through each tool specifically, but you can see there is a number of tools. I will show you how to use each one as we go through the removal and installation process. To my right, you can see the JIMS kit comes complete, including gaskets for the transmission. You will need, and I myself use James gaskets, outer primary, inner primary seals. That does not come with the transmission kit. But the JIMS kit from instructions to dipstick, to shifter, seals, a new transmission sprocket drive nut, bearings, main drive gear, obviously. You cannot use the stock five speed drive gear. Why would you? This gear again, depending on its working condition within the transmission, depending on the load it carries, the JIMS gears are between 18 and 53% wider than the factory five-speed. Shift fork, shift drum, all new nice chrome hardware. The transmission itself, the trap door is a nice chromed billet piece. Same thing with the clutch end cover. Make sure you work carefully. You don't want to disturb the chrome finish. You want it to be perfect when you're done with the installation. First thing we're gonna do, we'll take a look at the Dyna up on the lift. Obviously I keep painted components covered. Even though I'm working down low, I want to make sure all painted areas are covered. That way there, if a snap ring or something happens to get away from me, it doesn't chip the paint. I have removed the outer, the inner, the complete compensating sprocket and clutch assembly. When I removed the inner, I removed the starter motor. Obviously I drained the primary before I removed any of that. All of those components will go back into place. Same thing on the right side of the motorcycle. I removed the exhaust system. You're gonna encounter a number of different styles of exhausts. The key is to remember, we have a little more than a half inch wider. So you will have to modify your exhaust mounting bracket or where the exhaust pipes mount to the bracket when you reassemble the exhaust with the JIMS Fat 5 Overdrive in the transmission case. Now that I've laid out the groundwork as to what my intentions are to install the JIMS Fat 5 Overdrive transmission. It's time to get to work.