Steve Turner
Former Editor, 5.0 Mustang & Super Fords
June 1, 2001

Step By Step

View Photo Gallery
Energy Suspension offers its urethane engine mounts as a set with a matching transmission mount under PN 4-1124. List price for the set is $248. The engine mounts alone are available under PN 4-1122 and list for $210, while the transmission mount (not pictured) goes under PN 4-1104 and lists for $38. Keep in mind those are list prices and should be lower in mail-order retail reality.
Step one was raising our Mustang on a lift and supporting the engine with a small bottle jack. Then our good pal Mark Houlahan (tech editor at Mustang Monthly) loosened the factory fasteners, jacked up the motor, and removed the grungy stock mounts.
In addition to being cleaner and prettier, the Energy Suspension mounts are similar in design to the popular convertible mounts thanks to their low-profile steel design. The major difference, of course, is the use of polyurethane instead of rubber.
Our Energy mount wouldn’t go in at first because our tubular K-member didn’t have a hole to receive one of the mount’s locating pins. We checked the aftermarket K-member versus a stock K-member in a ’90 LX and it didn’t have the locating hole either. The answer was a swift whack with a hammer to remove the offending pin. Then the mount went right on.
With the engine elevated, Mark slid in both mounts, snugged the bolts, and lowered the engine down on the new mounts. Then he finished tightening the mounts. It turned out we didn’t have a bad mount, but a pesky engine vibration. The Energy mounts do transmit more vibration than the stock mounts, but once our quirky engine smoothed out, the car felt just like it did with the stock mounts, and far better than cars we’ve ridden in with solid mounts.

Gearheads looking to eke out every last drop of horsepower have long substituted solid engine mounts in place of the sloppy rubber Ford pieces. While the solid mounts eliminate the slight horsepower waste created by the engine twisting on the stock mounts, this efficiency doesn't come without a cost. Most evident is every rumble and vibration of your cammed-up 5.0 is transmitted right into the chassis where you can feel it. Those looking for middle ground have often bolted in engine mounts from Mustang convertibles because they are stiffer than the standard mounts, but they are still rubber so they still flex. If this flexing rubber routine is starting to sound familiar, it should. Corner carvers have long been swapping out rubber suspension bushings in favor of stiffer polyurethane parts. The result is less body roll and more precise handling. Recently Energy Suspension has put its Hyperflex urethane to good use in engine and transmission mounts for all manner of cars, including '84-'95 5.0 Mustangs. We thought one of our stock mounts had given up, so we gave these parts a try.