Muscle Mustangs & Fast FordsHow To Drivetrain
Shelby GT500 Power-Shifting Pro - Tech
Slither Through The Gears With PRO-5.0's New GT500 Super Shifter.
Grabbing Gears has been a right of passage for Mustang owners since the '60s. With your right foot planted to the floor and a quick stab of the clutch, you pop off the perfect powershift and experience bountiful bliss-until the point when the transmission goes kerblam-o! While transmission breakage is rarer today, it was a problem for many 5.0 owners in the late '80s and through the '90s, partially due to the factory T5, which was outmatched after slapping on a set of slicks or adding a few horsepower.
Weak gears broke often (especially Third), and shifter forks regularly bent under the strain of serious gear jamming. Making matters worse was the vague factory shifter that had a tendency to fail when the small bolts holding the lever would simply break off. A shifty solution came first from Hurst, then from a new company called Pro-5.0, which introduced the billet Power Tower shifter.
"I was racing a 5.0 and would ask other Mustang owners what their biggest problem was," says Joe Giaimo, owner of Pro-5.0, which is now Pro50.com. "The common answer was that racers were breaking shifter handles, so I came out with the gold steel handle. Then I decided to build a complete billet shifter for our own car. When people saw it, they had to have one, so we decided to go into production."
Muscle Mustangs & Fast Fords got its hands on the first Power Tower in 1994, when Giaimo offered one to former tech editor Neil Van Oppre for testing. Van Oppre and your author were both racing 5.0 Stangs regularly at Englishtown, and he knew most of my free time was spent grabbing gears (this was just before I started at MM&FF), so he asked to use my car for the test. I agreed, and with that we installed the first Pro-5.0 shifter into my '87 5.0 LX. The story "Stick It to 'Em" ran in the Jan. '94 edition of MM&FF.
"When you powershift, other shifters would get hung up and you could miss a gear," Giaimo says. "During the Second-to-Third shift, the internal pivot and ball have to come past dead center (Neutral) and then move over to get into Third. That's where the problem is, so we figured out that offsetting the internal shifter ball would eliminate the hangup, and it was a significant improvement. We then applied for a U.S. patent and got it, so now we're the only company with a patent for a shift-improvement mechanism. You can only achieve this through precision machining-not with a casting, only a billet manufacturing process. I've incorporated this into all of our designs."
Van Oppre and I were impressed with the billet design, the shifter stop bolts, and the overall ease of installation. We had the shifter installed in just over an hour, and it worked flawlessly. Over time, it helped me to throw a dizzying amount of powershifts, ultimately culminating in a run of 13.55 at 101 mph with the famed 10-minute tune-up, 3.55s, and Gatorback tires.