3.5-Inch M1 Lift Kit for Cast Steel LCA Silverado/Sierra 1500
- M1 loaded struts up front, M1 monotube shocks at the rear
- 3.5-inch lift for 2014–2019 Chevy Silverado 1500 and GMC Sierra 1500 4WD with cast steel lower control arms
- Denali, Denali Ultimate, and eAssist trucks are excluded
- Factory wheels need a 0.25-inch spacer, part 1065
- Cutting and grinding required — downloadable installation guide available
The Trail Fortress check
Will it fit your truck?
✓ Fits
+ 1 more applications
✕ Does not fit
- Denali or Denali Ultimate models
- Models with eAssist (ECO Hybrid) package
Requires cutting and grinding. Does NOT work with aftermarket control arms. New lift block replaces the factory-equipped block. To ensure proper fit please confirm if the stock control arms are cast aluminum cast steel or stamped steel. For a visual please click here. To ensure adequate clearance when lowering the differential models equipped with a mass damper on the front differential must be removed. To retain factory wheels a 0.25" wheel spacer will be required SKU: 1065. Fitment on this page is based on the manufacturer’s application data.
About this kit
3.5-Inch M1 Lift Kit, fitment-checked
M1 loaded struts and an M1 monotube shock pair sit on top of cast steel LCA knuckles here, lifting 2014–2019 Chevy Silverado 1500 and GMC Sierra 1500 4WD trucks 3.5 inches. The knuckles are specific to cast steel lower control arms — cast aluminum and stamped steel arms take a different kit. Denali, Denali Ultimate, and eAssist trucks are excluded, and the install requires cutting and grinding.
Cast steel lower control arms and M1 damping define this 3.5-inch lift kit for 2014–2019 Chevy Silverado 1500 and GMC Sierra 1500 4WD trucks, the 2019 Silverado 1500 LD, and the Sierra 1500 Limited. M1 loaded struts carry the front, an M1 monotube pair handles the rear, and the cast steel knuckles set the height without swapping springs. Confirm the lower control arm material before ordering — this kit will not fit cast aluminum or stamped steel arms — and rule out Denali, Denali Ultimate, and eAssist trucks. Cutting and grinding required; a downloadable installation guide is available.
What’s in the box
Kit contents
- 1× 3.5" Kit Box 12170BOX1
- 1× 2014-16.5 3.5in Cast Steel Lca Knuckles 12430BOX1
- 1× M1 Loaded Strut Pair 502130
- 1× M1 MONOTUBE SHOCK PAIR 770738P
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 12440 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 12440 |
| UPC / GTIN | 00840269910777 |
| Lift height | 3.5 in |
| Shock package | M1 series |
| Shipping weight | 134 lb |
| Country of origin | CN |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here