How to tell them apart..
Very little changed from the ’67 to the ’68 models of Mustang and to make things worse there was no serial number, vin number or any number identification regarding GT’s or GTA’s from Ford. So unfortunately there is no way of telling from the vin or door data. The equipment added to a GT or GTA was as follows from what I can work out: V8 engine with either of the 4 engine options, 289 2 barrel C code, 289 4 Barrel A code, High Performance 289 K code or 390 High Performance S code. Four inch fog lights in the grille at the end of the centre bar with a switch under the dash near the ignition with the letters fog on it. Side tape stripes with GT or GTA emblems. All other emblems were removed so you will not see any tri bar horse logo with engine id or any mustang lettering on the fenders. GT for 4 speed cars and GTA for automatics. Chrome quad exhaust outlets exiting through cut outs of the rear valance. GT gas cap, is a twist off unless you have the exterior décor group (in hood signal lights, chrome trim around trunk, pop open gas cap, etc.) which changes it to a pop open gas cap with black GT lettering on it.
Red GT lettering for 68. Power brakes with disc brakes up front and the name disc brakes on the brake pedal pad. Special handling package with heavy duty springs and shocks as well as thicker 7/8 inch front sway bar. The easy things to look for when checking out a GT or GTA mustang is the disc brakes, the emblems or lack of emblems or logos, fog lights and gas cap. Although these can now be purchased separately as a reproduction and could be added to the replica ’68. It’s a known fact/story that when these cars were ordered the dealership would order the parts and put them on the cars before sale, pretty much on an add hock basis.
Sometimes there is factory paper slip stuffed in the rear quarters etc. that will give the factory spec as it was manufactured. This is the only way you can guarantee a genuine factory GT.
Shelby GT KR
The initials KR stood for ‘King of the Road'[, and to back it up the mid-year 1968 KR had Ford’s new 428 Cobra Jet engine with Ram Air Induction and traction-lock 3.50 rear end all standard on the KR. Plus the 428 CJ option price was cheap compared to other high performance engines available at the time. Ford called the 428CJ its “bread and butter” performance engine that all could afford.
The Cobra Jet engine was very successful at the drags and was Super Stock Eliminator Champ at the 1968 Winter Nationals beating expensive Hemi’s etc. Shelby’s 1967 GT 500 had led Ford’s pony car with a Thunderbird 428 engine with two Four-barrel carburettors.
The 1968 GT500 used a 428 Police Interceptor with single four barrel carburettor. Then in April ’68, Ford unveiled an even-hotter version of the 428 Police Interceptor (more durable engine) with better breathing heads and much bigger exhaust manifolds and called the soup’d up 428 Cop Motor the 428 Cobra Jet. The 428CJ was offered in the Mustang, Cougar, Cyclone and Fairlane models.
The GT 500-KR’s 428 had the same suspiciously low 335-bhp rating as other Cobra Jets, but the total torque rating of 440 foot-pounds at 3400 RPM told the real story. Shelby’s KR version had diecast aluminium cast with “Cobra Lemans” proudly broadcasting Ford’s FE engine family victory over Ferrari at Le Mans in 1966 and 1967.