3. We initially tried to save some time by getting another flywheel resurfaced before doing the swap, but as usual, it didnt work out as planned. All 5.0L flywheels beginning in 1981 share the same 50-ounce imbalance (left). What we didnt know was that the flywheels are different from 86 on up (right). These accept a larger 10.5-inch clutch versus the older 10-inch clutch and have a different bolt pattern. The flywheel we resurfaced was from an 85-and-older model and our car is an 89. If you have an older 10-inch assembly, Centerforce recommends you purchase a newer flywheel and upgrade to the 10.5-inch clutch.