Pros:	Reduced shift throw, solid shifts (no “play” in linkage)
Cons:	Requires some crawling on the ground if you don’t have access to a lift
Cost:	List price: $300 (from UUC motorwerks)

The UUC motorwerks M roadster/coupe short shift kit comes with all the parts you need to reduce the shift throw of your M roadster or coupe by 15-20%. The kit includes a replacement M roadster shifter lever with a custom bend in it, a CNC machined adaptor to mate the shift lever to the shift selector rod, all clips, pins, washers, and lubricant needed for the installation, replacement Delrin bushings for the shift carrier, and a special tool for removal of the shifter cup.

The kit also comes with a 17-page booklet detailing every aspect of the installation. The instructions are detailed, but it is wise to take some time to familiarize yourself with all the different terms used before beginning, and to constantly go between looking at the parts on the car and the pictures and descriptions in the booklet. If you don’t know what all the parts are (I didn’t when I started), it may not be immediately obvious what the “carrier” is, for example.

Besides all the parts in the kit, you will need some tools. An 8mm hex bit or 8mm allen hex wrench is absolutely necessary. You will also need some blue “Loctite” threadlock. A small hammer may be necessary to tap some things into place, and a flashlight is a must. A large flat-bladed screwdriver is needed, and snap ring pliers (tips to the side, not straight out) and work gloves are recommended although not absolutely necessary (I made do without them, but having them would have made the job easier). You will also either need access to a lift (recommended if you have any chance to get your car on one) or jackstands to lift the front of the car. Two final notes before beginning: First, make sure the car is cool. You will be working all around the exhaust. Second, some parts of the installation are almost impossible without two people. For example, sometimes one person will need to be under the car, working to attach something to the bottom of the shift lever, and at that time it is very useful if you have someone else above the car to hold the shift lever in place and keep it from flopping around.

Step 1 is to remove the shift knob by pulling up on it forcefully. Be careful not to mash your nose, and also be careful not to rip loose the wires for the lighted shift knob that M roadster and coupes feature. After you have the shift knob loose, pull on the leather boot on the sides towards the center and lift the boot up. This will expose a foam insulating insert which covers the connection to the lighted shift knob.

Tug the foam insert up out of the way and unplug the connector for the lighted shift knob. You should now be able to set the shift knob, leather boot, and foam insert to the side.

If you feel like having a little fun at this point, you could try driving your car around the block using just the stub of the shift lever–the effort is noticeably increased, but you get a great Miata-like feel to the shifter. This just makes you look forward to getting the short shift kit fully installed!

Notice in the pic of the bare shift lever that there is a rubber boot around its base. Your next step is going to be to pull up on it to remove it.

Once the rubber boot is off, you can see the top of the aluminum carrier. In this is the nylon cup which holds the ball of the shift lever in place.

Now that the rubber boot is out of the way, push the shift lever to the right and look down on the left hand side of the carrier underneath it. You should see a circlip. This clip is what is holding the selector rod in place in the hole in the bottom of the stock shift lever. You can push the clip off with a screwdriver, use a pair of snap ring pliers to remove it, or push it off with a gloved hand. After removing it, remove the small yellow washer and you should then be able to push the selector rod pin out of the shift lever.

I was naive about how the shifter lever in an M roadster actually connected to the transmission. I had no idea what a “carrier” was. The carrier is a metal piece that attacnes to the top rear of the transmission and extends rearward into a rubber fitting behind the shift area. The shift lever itself has a round ball that mounts into a nylon cup which fits in the circular area of the carrier. The bottom of the shift lever is under the carrier and attaches to a selector rod which extends forward to the transmission. The UUC instructions are about to tell you to remove the nylon cup and then to remove the carrier. This is a picture of the carrier next to the car so you can realize how long it is–this will keep you from a little bit of puzzlement as you try to figure out where various clips are (that you need to remove) in relation to the shifter lever.

I’m going to fast forward a bit in the installation. The instruction booklet from UUC contained better pictures than I could take with my camera–since I didn’t have the car on a lift, I just didn’t have room to try to take any pictures from under the car. The UUC instructions clearly take you through removing the shifter cup (either with the supplied shifter cup removal tool or, in a pinch, with a pair of small screwdrivers). The instructions then take you through removing a clip/pin that attaches the front of the carrier to the top of the transmission. Take your time feeling out where the carrier ends and where this clip is. It is not immediately obvious and is hard, if not impossible, to see–you just have to feel along. The clip can be hard to pry up–as the instructions say, “some cursing and swearing tends to make the job easier”. I really recommend trying this tip, as it really works!

Once you have the carrier out of the car (see picture above of it laying next to the car), you can remove the stock rubber bushing shown already out at lower right in this picture) and replace it with the Delrin bushings shown on either side of the hole in the carrier in this picture.

Before reinstalling the carrier, you need to flip the selector rod (which is currently still attached at the transmission end) from side to side and end to end. You will need to remove a circlip from it at the transmission end just like you did at the shift lever end. Make sure to note where yellow washers are used when you take it off and put new ones (supplied with the UUC kit) in place when you reinstall the selector rod. When you take the selector rod out, you should see that in its original position, it had its pins pointing towards the left side of the car, and had a “kink” or bend in it near the transmission end, which bend “pointed” up, giving the rod a little clearance over the driveshaft. When you flip the rod end to end and side to side, you will be reinstalling it with the pins pointing to the right side of the car. If done properly, the kink will now be towards the rear of the car and will still be pointing “up”. This is important to maintain clearance of the drive shaft.

After moving the selector rod, you now need to reinstall the carrier. Again, the clip that fastens it to the transmission is going to give you fits. UUC provides a replacement clip, which you need because you will probably destroy the original clip when you remove it. Make sure to get the replacement clip snapped down all the way when you install it.

Once the carrier is back in place, you should slip the UUC-provided new nylon cup over the ball of the shift lever, slide the cup into the hole in the carrier, and snap it into place as per the instructions. Use the provided grease to lubricate the ball of the shifter before placing it in the nylon cup. Unlike the stock lever (shown at bottom of picture), the UUC lever (top of picture) has a bend in it. Make sure that the lever leans towards the back of the car, and that the bottom part of the lever is also pointing towards the back of the car.

You now will install the supplied adaptor onto the bottom of the shift lever. Note that it can be installed in one of two positions. You should install it in the 15% reduction position to match the way you have now flipped the selector rod. Continue with the instructions to attach the selector rod to the adaptor.

Back to the rubber boot–after you have the shift linkage reassembled, and you have tested your way through the gears, you need to reinstall the rubber boot. The instructions do tell you to make sure to get the bottom of the rubber boot around the top “lip” of the carrier. However, they don’t say that the best way to do this is probably from beneath the car. Get your fingers up in there and tug the boot down around this lip–this is important to keep dirt from getting in the pivot point of the shift mechanism. After reinstalling the rubber boot, reinstall the foam insulation, reconnect the lighted shifter wires, and reinstall the leather boot and shift knob, all in the opposite of the order in which you took them off.

gear pair Stock

throw UUC

throw difference

(savings)

1-2

2-3

3-4

4-5 3 11/16″

3 3/4″

3 11/16″

3 11/16″ 3 3/16″

3 3/16″

3 3/16″

3 1/4″ 1/2″

9/16″

1/2″

7/16″ So, what is it like when you are done? I took the following measurements. In general, the UUC short shift kit reduces the throw about one-half of an inch between each pair of gears. This may not sound like a lot at first, but it certainly feels different when shifting and is a very nice change. The shifter feels like it should have come this way from the factory.

The animation below shows the stock shifter on the left and the UUC shifter on the right. This gives you some idea of what it is like to shorten your shift throw the UUC way.

All in all, I recommend the UUC short shift kit. The installation is difficult for a first-timer, but having been through it once, I think it would be much easier the second time around now that I know where all the components are and what they look like. It feels great in my car, and I have been enjoying it each day since I installed it.

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