Overview
The Pro Comp EXP63156, also written 63156, is a 2.5-inch front leveling kit built around torsion keys for the 2020–2022 Chevrolet Silverado 2500 HD, the 2020–2022 GMC Sierra 2500 HD and the 2022 GMC Sierra 3500 HD. The kit is a direct fit for both 2WD and 4WD models.
A torsion key is a small adjuster that changes the preload on the front torsion bar, which raises the front end without changing the factory bar. Pro Comp describes these keys as precision-forged chromoly, and says they are stronger than OEM cast parts.
The adjuster bolt pockets are machined for a snug fit on the torsion bar. The maximum tire size is 33×12.50, and the front can take wheels and tires up to 33 inches in diameter.
Key features
- 2.5-inch front lift using forged chromoly torsion keys
- CNC-machined adjuster bolt pockets for a snug fit on the torsion bar
- Black powder coat finish
- Includes OEM upper shock spacers
- Maximum tire size 33×12.50
Torsion keys and front height
Torsion bars carry the weight of the front end, and a torsion key changes the preload on that bar to raise the front. Because the lift works through the bar rather than a spacer, front shock position and suspension travel should be checked for clearance at full compression and full extension.
Changing front height also affects steering geometry, so an alignment and a headlight aim check are sensible after the install. Owners who tow or carry heavy front accessories should recheck the front end after the first few weeks of use, since settling into the new setting can take some time.
- Confirm shock length before ordering
- Measure front ride height on both sides
- Recheck the adjusters after the first drives
Specifications
| Brand | Pro Comp Suspension |
|---|---|
| Part number | EXP63156 (63156) |
| Lift height | 2.5 inches, front |
| Front lift method | Torsion keys |
| Kit includes | Torsion bar keys and OEM upper shock spacers |
| Shock relocation bracket | Longer shocks recommended |
| Track bar drop | Not included |
| Bump stops | None |
| Maximum tire size | 33×12.50 |
| Finish color | Black |
| Material | Metal, steel spacer material |
| Fitment type | Direct fit |
Vehicle fitment
It fits the 2020–2022 Chevrolet Silverado 2500 HD in the Custom, High Country, LT, LTZ and WT trims, the 2020–2022 GMC Sierra 2500 HD in the AT4, Base, Denali, SLE and SLT trims, and the 2022 GMC Sierra 3500 HD in the AT4, Base, Denali, SLE and SLT trims.
The 1500 series trucks and the 2019 and earlier HD trucks are not on this list. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Torsion key kits change the front ride height by adjusting the bar, so the front alignment and the headlight aim should be checked after installation. Longer shocks are recommended by Pro Comp for this kit.
What’s included
The kit includes torsion bar keys and OEM upper shock spacers. Longer shocks are recommended for this kit but are not included, and the track bar drop is not included.
Not included: longer shocks, which Pro Comp recommends, and the track bar drop.
