What the 1990 Shelby GT500 Actually Was
The 1990 Shelby GT500 wasn't a new car from the ground up. It was Carroll Shelby's last shot at a Fox-body Mustang before the whole SVT Cobra program took over. Ford built about 464 of them, and they came with the 5.0L WIND ( Windsor ) V8 that was already in the Cobra/R-spec vehicles. That engine made around 225 horsepower on paper, which sounds modest until you remember the car weighed roughly 3,200 pounds and had a much more aggressive suspension setup than a regular GT. Shelby American did the conversion: swapped in the T5 transmission, added the Hurst shifter, fitted wider BFGoodrich Radial T/A tires, lowered the springs, added a re-tuned exhaust, and wrapped it in the iconic stripes and badging. The result was arguably the best handling Mustang you could buy new in 1990 without going custom.
The 1990 Shelby Gt500 The Highperformance Pony Of The 1990s
Here's the thing most people miss about this car: the WIND engine was not the same as the standard 5.0. Ford had reworked the cylinder heads with better-flowing intake ports, a higher-lift cam, and revised combustion chambers. The difference between that and a basic GT 5.0 is noticeable at anything above 4,000 RPM. The stock GT felt like it hit a wall at redline. The Shelby version kept pulling. I picked up a project car back in 2012 that had been sitting for about eight years. The seller claimed it was a "numbers matching" GT500. It was, mostly. The engine had been rebuilt at some point with aftermarket parts, and the transmission had been swapped for a Toploader just because someone thought it was a better build. What I found after tearing into it was that the original T5 was still in the trunk with the correct bellhousing. So I went back, tracked down a replacement main shaft seal that was the right spec, and swapped the original transmission back in. It took about three hours, but it was worth it to have the car running like it left the dealer in '90. The big problem people run into with these is the clutch hydraulic system. The master cylinder sits up on the firewall and the seal hardens over time. When you press the pedal, you'll feel it sink to the floor and not come back. That's not a bleed job. You replace the master cylinder and the slave, and then you bench-bleed both before installing. If you just pump the pedal and hope, you'll be sitting there for two hours getting air out of the system and still not getting a firm pedal. I've done this three times on three different cars now, and each time the fix is the same: new both cylinders, bench bleed, then install.
Another issue that catches people off guard is the fuel system. These cars used a return-style fuel system with a mechanical fuel pump mounted on the engine block, unlike later models that went electric. If the diaphragm in that pump fails, you get fuel leakage and a no-start condition. The fix is a rebuild kit from a supplier like O'Reilly or Summit, but the parts are getting harder to find since Shelby American stopped supporting the line years ago. I ended up fabricating a simple bypass using a modern electric inline fuel pump and mounting it inside the tank. It was cheaper than sourcing a used pump from a junkyard and gives more consistent pressure anyway. The suspension components also wear out in predictable ways. The lower control arm bushings go soft, the upper ball joints develop play, and the rear trailing arms loosen. A full re-build of the front suspension with new bushings and ball joints runs about $400 to $600 in parts. The rear is simpler—mostly just new bushings and maybe new shock mounts if the original ones are cracked. I did a full rear suspension refresh on one and it took about two hours with a basic socket set and a jack stand. No special tools required. Here's something nobody tells you about these cars: the interior wiring harness is a weak point. The connectors behind the dash corrode over time, and you'll get intermittent electrical gremlins that make no sense. Random radio silence, dashboard lights flickering, the turn signals acting up. The fix is to spray the connectors with contact cleaner and use dielectric grease on the pins. It's a ten-minute job per connector and it solves most of the weird issues owners complain about.
Get the Full Details
If you're looking for a genuine 1990 Shelby GT500, expect to pay between $30,000 and $50,000 depending on condition and originality. There are plenty of replicas out there, so you need to check the VIN and the Shelby American documentation. The conversion was done by Shelby American in Las Vegas, and they kept records. A car without those papers is either a replica or a heavily modified stock Mustang, which is fine if that's what you want, but don't pay a premium for it. The drivability of these cars is decent for what they are. The T5 transmission has tight shifts but isn't as durable as a modern gearbox. Don't abuse it. The suspension is firm but not unbearably harsh on smooth roads. On rough pavement it's a reminder that this is a performance car from the early nineties, not a daily driver. The braking power is adequate but not great—you'll want upgraded pads and braided lines if you plan on track use. One more practical note: parts availability is mixed. Engine internals for the WIND 5.0 are still available from Ford performance catalogs, but body panels and trim pieces can be expensive to source. I found a good supplier for the stripes and badges, but the side scoops and rear spoiler were nearly impossible to find new. I ended up getting a used set from a wrecked Fox-body GT and having them refinished to match. Took about six weeks and cost around $800, but it saved me from buying a reproduction that didn't look quite right.
The 1990 Shelby GT500 isn't the most powerful car you can buy, but it's one of the most well-rounded Fox-body performance packages ever offered. It handles better than a standard Mustang of the era, has a solid powerplant, and carries the Shelby badge that means something to the right people. Just be prepared to do some work if you buy one. They're not ready to drive right out of the box most of the time.
