5.0 Mustang & Super FordsHow To Drivetrain
IRS-To-Stick-Axle Swap - Outrunning The IRS
Get Away Quicker With An IRS-To-Stick-Axle Swap Kit From Paul's High Performance
When it comes to adjusting the control arms to set pinion angle, PHP recommends 2.5-3 degrees for a good street/strip combination. Exceeding 4 degrees is sure to result in vibration on the highway. A really aggressive pure-strip setup would be between 4 and 5 degrees.
Despite offering out-standing street and road-course manners, the Mustang Cobra's sophisticated independent rear suspension has quite literally proven to be a pain in the rear to drag racers. The troubles have included component fragility and e.t.-killing axle hop under the Cobra's necessarily brutal drag-launch conditions. We say "necessarily brutal" because the small-cube DOHC's general lack of low-end grunt basically dictates a high-rev launch to avoid bogging on sticky drag tires. Even major factory upgrades to the IRS-beginning with the supercharged '03 Cobra-haven't completely cured its general incompatibility with the quarter-mile. It's a lot tougher than it used to be, but it can still hop like a one-legged sprinter when the clutch is sidestepped at six grand.
Probably few people in the Mustang world have had more opportunity to experience these axle antics than Paul Svinicki, a man whom we all know shows absolutely no mercy when it comes to modular starting-line technique. Realizing the only real solution for New Edge Cobras that see regular strip duty is to retrofit a live axle, Paul and his crew at Paul's High Performance have bundled together an extremely comprehensive swap kit to affect the fairly uncomplicated transplant.
If you order the kit, the box being delivered will be huge, containing not only a stoutly constructed 8.8-inch solid-axle assembly, but also all the locating and mounting hardware necessary to install it, right down to the last fastener and bracket, and even a new after-cat exhaust system. In exchange, you will hand over $5,200-a reasonable sum considering the totality of the kit. Read on and we'll detail what the package includes and what's involved in bolting it in place of the drag-troublesome IRS.