Anyone who has wrestled an old four-speed through city traffic knows the feeling. The shifter fights back, the gears feel far apart, and the engine screams on the highway because there is nowhere left to go. Classic muscle cars deserve better than that, and plenty of owners now agree. Swapping in a modern gearbox is one of the most rewarding changes you can make, because it improves how the car feels every single time you drive it. That is why 5 Speed TKX Transmission Packages have become such a popular choice among restorers, street builders, and weekend racers. A complete package gathers the gearbox and the parts that go with it, so you are not left tracking down a bellhousing, a crossmember, or a shifter that does not quite line up. It also takes much of the guesswork out of fitment, which saves hours in the garage and money at the parts counter. Of course, a good transmission only helps when it suits your engine, your tyres, and the way you actually drive. In this guide, we...