yes 5L5 is right, however you don't always have to replace the gear, and i have even cut some of the teeth off of the slider to make it shift quicker at lower rpms. Sometimes you can file the burrs that the missing gears and powershifting puts on the slider, or the gear itself, i was trying to keep it simple.. lol
if you need plan on doing this yourself, i have the sliders if you want them. I will sell them cheaper than you can probably find them to someone on here
jason