6 Inch Lift Kit with M1 Monotube Shocks
- Ships as a kit: steering assembly, crossmember box, skid plate box, universal kit box, add-a-leaf spring kit, and two M1 monotube shock pairs
- Room for tires up to 35 inches; torsion-bar drop brackets and a front skid plate are part of the design
- Install scope: minor cutting and grinding, exhaust rerouting for driveshaft clearance — downloadable installation guide available
- Not for straight front axle models; Tahoe/Yukon and Suburban need extended rear sway-bar links (1038), 4-door Tahoe and Yukon need crossmember bracket kit 89501
The Trail Fortress check
Will it fit your truck?
✓ Fits
Universal part — no vehicle-specific application data.
✕ Does not fit
- Straight front axle models
Requires minor cutting and grinding. Requires rerouting of the exhaust for front drive shaft clearance. Tahoe/Yukon, Suburban models require extended rear sway-bar links. SKU: 1038. 4-Door Tahoe and Yukon models require torsion bar crossmember bracket kit. SKU: 89501. Models equipped with AutoTrac will require a new aftermarket driveshaft. For ease of installation, a torsion bar removal tool is recommended 1067. Fitment on this page is based on the manufacturer’s application data.
About this kit
6 Inch Lift Kit with M1 Monotube Shocks, fitment-checked
Rough Country 27640 is a 6 inch lift kit built around two M1 monotube shock pairs, with a steering assembly, crossmember and skid plate boxes, and an add-a-leaf spring kit listed in the bill of materials. Clearance is rated for tires up to 35 inches. Plan on minor cutting and grinding plus rerouting the exhaust so the front driveshaft clears; straight front axle models are not covered, and AutoTrac-equipped trucks need an aftermarket driveshaft.
What’s in the box
Kit contents
- 1× Strng Asmbly 1274 BOX 7
- 1× Universal Kit Box 274BOX1
- 1× Crossmember Box 274BOX2
- 1× Skid Plate Box 274BOX3
- 1× Kit Box 274BOX4
- 1× Add-A-Leaf Spring Kit 6112
- 1× M1 MONOTUBE SHOCK PAIR 770768P
- 1× M1 MONOTUBE SHOCK PAIR 770790P
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 27640 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 27640 |
| UPC / GTIN | 00840269917202 |
| Lift height | 6 in |
| Shock package | M1 series |
| Shipping weight | 230.5 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here