If you own a 1979-93 Mustang or Mustang GT, you understand the limitations of the Fox-body Mustang’s four-lug hubs. Four-lug underpinnings limit your choice of aftermarket wheels and certainly tire size.
We’re doing a four- to five-lug conversion on a 1986 Mustang GT convertible at Modern Driveline just outside of Boise, ID, and we’re going to show you how to get it done in an afternoon. Baer and Summit Racing Equipment will provide the brute stopping power along with the four- to five-lug conversion, which makes perfect sense when you’re taking the five-lug leap.
If you’re going to perform a four- to five-lug conversion on a 1979-’84 Mustang with the original 7.5-inch rear axle, it is suggested you also convert to an 8.8-inch rear axle. It’ll make the going smoother, and you’ll wind up with a stouter rear-end at the same time. Summit Racing has everything you’re going to need to get into five-lug durability and performance. We’ve opted for 31-spline direct replacement axle shafts from Motive Gear, which will provide durability and the convenience of five-lug performance.
Let’s get started! Scroll through the slide show below to see how the process went down.