6-Inch Lift Kit with N3 Shocks for Chevy/GMC 3/4-Ton 4WD (1977-1987)
- Fits 1977-1987 Chevy K20, K20/V20 Suburban and GMC K25/K2500, K25/K2500 Suburban 4WD models — see the full fitment list
- Fits only trucks equipped with 52-inch rear leaf springs; front sway-bar vehicles should add drop brackets (SKU 1019)
- Kit contents: 6in front and rear leaf springs, raised steering arm, brake line relocation brackets, U-bolts, bushing kit, hardware
- Two N3 shock pairs included; trucks with factory quad shocks (2 front shocks per side) run a single shock per corner
- Listed tire options up to 37x12.50R20; the 37x13.50R15 on 15x8 at -39 offset calls for trimming
- Install time 6 - 8 hours — downloadable installation guide available
Check tire fit for this kit → The manufacturer publishes 4 verified tire sizes for this kit, with wheel width, bolt pattern and offset for each.
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ONLY fits models with 52" rear leaf springs. If vehicle is equipped with a front sway-bar drop brackets are recommended. (SKU: 1019) Vehicles with factory quad shocks (2 front shocks per side) will simply use a single aftermarket shock. Fitment on this page is based on the manufacturer’s application data.
About this kit
6-Inch Lift Kit with N3 Shocks, fitment-checked
Rough Country 21030 is a 6-inch lift kit for 1977-1987 Chevy K20/K20 Suburban/V20 Suburban and GMC K25/K2500 4WD trucks and Suburbans. It uses front and rear lifted leaf springs with application-valved N3 series shocks. It fits only vehicles built with 52-inch rear leaf springs, so measure before ordering.
This 6-inch lift kit for the 1977-1987 Chevy and GMC 3/4-ton 4WD trucks and Suburbans replaces the leaf springs at both ends rather than stacking spacers, and adds a raised steering arm plus brake line relocation brackets up front. The rear side ships with U-bolts, a bushing kit, and installation hardware. Verify that your truck has 52-inch rear leaf springs first; if it carries a front sway bar, drop brackets (SKU 1019) are recommended and ordered separately. Rough Country lists an install time of 6 - 8 hours, and a downloadable installation guide is available for the sequence.
What’s in the box
Kit contents
- 1× Universal U-Bolt Kit 7616$39.95
- 2× 6in Rear Leaf Spring 8028
- 1× S800012bshing Kit 6070
- 1× Installation Kit 7511
- 1× Raised Steering Arm 6600$79.95
- 2× 6in Front Leaf Spring 8015
- 1× N3 Shock Pair 23173
- 1× N3 Shock Pair 23174
Priced components are sold separately here, so a worn shock or arm can be replaced on its own later.
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 21030 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 21030 |
| UPC / GTIN | 00843030145774 |
| Lift height | 6 in |
| Shock package | N3 series |
| Shipping weight | 281 lb |
| Country of origin | ID |
| Category | Suspension & Lift Kits › Lift Kits |
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