In 1999, Ford introduced the updated New Edge Mustang. This redesigned Mustang featured sharper body styling, upgraded engine platforms, and a new independent Rear Suspension for the SVT Cobra chassis. This IRS rear end was extremely popular with street and open-track enthusiasts who wanted to carve corners. But when it came to any high horsepower drag racing applications, this design lacked in some areas.
Over the years, aftermarket manufacturers have produced upgraded components for the IRS rear end that have completely redesigned the downfalls plaguing the 99-04 IRS. As with any performance modification, proper torque specs are needed to ensure your upgrades are installed the way they should be!
1999-2004 IRS Torque Guide
| Suspension Component |
Newton Meters"NM" |
Pound-Feet "LB/FT" |
| Subframe-to-Body Bolts |
103 |
76 |
| Subframe-to-Rear Bracket Bolts |
103 |
76 |
| Subframe Rear Bracket-to-Body Bolts |
80 |
59 |
| Shock Absorber-to-Lower Arm and Bushing Bolts |
133 |
98 |
| Shock Absorber-to-Body Nuts |
40 |
30 |
| Upper Arm and Bushing-to-Subframe Nuts |
90 |
66 |
| Upper Arm and Bushing-to-Knuckle Nuts |
90 |
66 |
| Lower Arm and Bushing-to-Subframe Bolts |
250 |
184 |
| Lower Arm and Bushing-to-Knuckle Nuts |
115 |
85 |
| Toe Link-to-Subframe Nuts |
48 |
35 |
| Toe Link-to-Knuckle Nuts |
48 |
35 |
| Stabilizer Bar Bracket Bolts |
55 |
41 |
| Stabilizer Bar Link Nuts |
48 |
35 |
| Rear Axle Differential Rear Insulator-to-Axle Housing Bolts |
103 |
76 |
| Rear Brake Disc Dust Shield-to-Knuckle Bolts |
10 |
n/a |
| Brake Line-to-Rear Brake Caliper Bolts |
40 |
30 |
| Parking Brake Cable to Lower Arm Bolts |
15 |
11 |
| ABS Sensor Bolts |
23 |
17 |
| Axle Shaft-to-Hub Retainer |
325 |
240 |
| Wheel Lug Nuts |
129 |
95 |
Source:Alldata.com
