88-98 Chevy SAS kit for 99-04 Ford Super Duty Axles



Measure your inner frame width.  There are multiple variations of frame width and this kit specifically only fits one --39.5"--  (diagram is located in images section)

If you don't have this frame width, this kit will not fit your application.
What it is designed for:
  • 88-98 GMT 400 Chassis Chevy Trucks w/ Inner frame rail dimension at shackle mount point of 39.5"  Does not work on the thicker (4") 1/2 ton GMT 800 frames
  • 99-04 Ford Dana 50-60 solid axles with 37.5" spring pin center-line.
  • 47" Chevy 73-87 Front Springs or with slight hardware mods 56" 99-04 Super Duty Front Springs

Looking for Crossover Steering Specific to this kit? Click Here

Looking to swap a Superduty Axle but your frame is not 38.5" or 39.5" wide? Spring hanger and many shackle options are available in our Builder's Parts section



Kit is weld on, will require drilling the frame for the tube needed going through to hang shackles. Picture shown of how the shackles will sit. This will require basic geometry skills to square the hanger to the frame and shackles.

Kit will add 6" of lift over the springs. A stock spring will give you 6" of lift.

Ford super duty axle will require either swapping the rear 10.5 Sterling axle in place of existing axle or changing bolt pattern on the front axle from metric pattern to 8x6.5.

Laser cut and CNC formed PnO steel, made in the USA!

Front leaf hanger is 3/16th steel with a 3/16th skeleton brace, making it effectively 1/2" plate strength. Shackles are 3/8ths plate. Frame tube is 2x.250 wall DOM.  Kit uses a special machined UHMW bushing and 3/4" bolt for the frame tube for long life, and less bushing sway.

Customer Photos:
Off Road Innovations      Winchester, Virginia     (540) 665-0123
Chevy 2500 w/ a Ford KingPin 60 (perches moved out to 37.5")

This is a DIY kit, the simple way to install it is to bolt the kit, to the leaf springs, to the axle. Make sure you have them fairly square, then set axle under the truck. Determine where you want the tire to sit in the fender well and tack front hanger in place. Next set frame tubes directly under the frame with shackle vertical. The frame tube should be positioned through the frame at this vertical point, with 1"-1 1/2" of space from bottom of frame to the bottom of the tube. Tack tubes in place and set weight on the axle to double check position. Shackle should sit slightly rear ward, 15* and axle should be where it is desired.  If you are not satisfied with either the shackle angle or tire location,  cut tack welds and adjust.

Sky's Bolt Torque Reference Sheet

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