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Fabtech 6-inch RTS lift kit with Performance shocks

A lift kit from Fabtech: 6 in front lift. Fabtech makes it for 1 truck generation, each with its own part number and conditions.

By the FitsMyTruck team. Figures come from Fabtech's own spec sheets and fit charts, part numbers are checked against the live listings, and the page is reviewed before it goes up. Last reviewed Oct 24, 2026.

The Fabtech 6-inch RTS lift kit with Performance shocks in brief

The Fabtech 6-inch RTS kit, part number K1159, is listed for the Chevy Silverado 2500HD and GMC Sierra 2500HD, 2020 to 2026, in both 2WD and 4WD. It is a full suspension lift with a 6 in front lift and Performance shocks included. Fabtech lists 37 in as the largest tire. For the rear, the kit uses 3 in rear lift blocks, though the maker does not state the resulting rear lift. On the front, crossmembers retain factory alignment cams for easy adjustment, and differential mounts reposition the front diff for the correct CV and driveshaft angle. The kit is matched here to the 2020-2026 Chevrolet Silverado 2500 HD. The line has 1 part number, and a diesel footnote plus two other exclusions decide whether it fits.

full suspension liftKit type
6 inFront lift
not publishedRear lift
includedShocks included or required

Specifications from the maker

full suspension liftKit type
6 inFront lift
not publishedRear lift. 3 in rear lift blocks; the resulting rear lift is not stated
includedShocks included or required
37 inLargest tire the maker lists
2WD and 4WDDrive fitment
Crossmembers retain factory alignment cams for easy adjustment; differential mounts reposition the front diff for the correct CV and driveshaft angle.Alignment and driveline notes

Which part number is yours

K1159 is the only part number on this line. The application is Chevy Silverado 2500HD and GMC Sierra 2500HD, 2020 to 2026, with 2WD and 4WD listed. The maker footnotes read: can not use OEM wheel and tire, and does not fit standard cab models. A third footnote says diesel models only (footnote 167), but the footnote does not say which part it applies to, so confirm gas fitment with the maker. Match the part number K1159 and the model code on the listing. Uniball upper control arms are a separate option (FTS21283), so a listing that says K1159 alone does not include them. Fabtech lists 37 in as the largest tire for this kit, and the wheels and tires must be aftermarket because the OEM set can not be used. The maker does not publish an install time, and it does not state the rear lift that results from the 3 in blocks.

Trucks it fits

  • 2020-2026 Chevrolet Silverado 2500 HD

    • Fits, K1159

    Fabtech K1159 fits 2WD and 4WD trucks and is listed for 2020-2026. You cannot use the factory wheel and tire with it, it does not fit standard cab models, and Fabtech's footnote 167 says diesel models only without saying which part it applies to, so confirm gas fitment with the maker. Uniball upper control arms are a separate option (FTS21283).

    All lift and leveling kits for this truck

Before you buy a lift kit

Questions owners ask

Is the Fabtech 6-inch RTS kit for diesel only?

The maker lists a footnote reading diesel models only (footnote 167), but the footnote does not say which part it applies to. Confirm gas fitment with the maker before ordering K1159.

Do the Uniball upper control arms come with K1159?

No. The maker lists Uniball upper control arms as a separate option, part number FTS21283. K1159 carries a 6 in front lift and includes Performance shocks.

Will K1159 fit a standard cab Silverado 2500HD?

No. The maker footnote says it does not fit standard cab models. The listing covers the Silverado 2500HD and Sierra 2500HD, 2020 to 2026, in 2WD and 4WD.

What is the largest tire for the Fabtech 6-inch RTS kit?

Fabtech lists 37 in as the largest tire. The maker footnote also says you can not use the OEM wheel and tire, so plan on aftermarket wheels and tires.

How much rear lift does K1159 give?

The kit uses 3 in rear lift blocks, but the maker does not state the resulting rear lift. The 6 in figure is the front lift.

Where these figures come from

Every figure above is Fabtech's own, from its spec sheets, fit charts and install guides, checked on Oct 24, 2026.

1 maker documents
  • Fabtech Motorsports, manufacturer product page (page text read with WebFetch; Fabtech public WooCommerce store API response hashed), read Oct 24, 2026