Apex Chassis ProLock Drag Link | 1.75" Black Anodized Aluminum | 2017-2026 Ford F-250/F-350 Super Duty 4WD | SKU KIT373-BLK
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Before ordering, verify your vehicle details, current setup, and SKU with OFAS fitment support so your upgrade matches your build.
Shipping & Delivery
Free shipping is available within the lower 48 U.S. states. Large or heavy items may ship by freight, and delivery timing can vary by warehouse, carrier, and product availability.
Fitment, Shipping & Product Support
The Apex Chassis ProLock Drag Link (KIT373-BLK) is a direct-replacement extreme-duty drag link for the 2017–2026 Ford F-250/F-350 Super Duty 4WD (excludes wide track). 1.75" black anodized aluminum adjusting rod, oversized drag link ends with SAE 1045 forged steel housings, SAE 4140 hot-forged chromoly ball studs, ProLock™ machined keyway washers, proprietary jam nuts with 3 wrench-flat set screws for adjustment retention under vibration and load. Reversible design supports flipped applications on taller lifts. Built for 2–6" lifted applications to correct bump steer and steering vagueness the OEM drag link introduces beyond stock ride height. Full front-end alignment required post-install.
Drag link only — tie rod sold separately as KIT372-BLK. Complete master kit (KIT375-BLK) bundles both for one installation and one alignment. For the DOM steel version of this drag link, order KIT373-STL instead.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | KIT373-BLK |
| Brand | Apex Chassis |
| Platform | 2017–2026 Ford F-250/F-350 Super Duty 4WD |
| Component | Drag link only — tie rod sold separately (KIT372-BLK) |
| Complete Kit | KIT375-BLK — drag link + tie rod bundled |
| Steel Version | KIT373-STL — DOM SAE 1020 steel with matte black powdercoat |
| Adjusting Rod Material | 1.75" black anodized aluminum |
| Housing Material | SAE 1045 solid steel forged housing — CNC machined |
| Ball Studs | SAE 4140 hot-forged chromoly — induction heat treated |
| Bearings | Rugged metal-to-metal |
| Boots | CR rubber accordion boots |
| Adjustment System | ProLock™ machined keyway washers + dual-thread jam nuts with 3 wrench-flat set screws |
| Joint Type | High-misalignment ends |
| Finish | Black anodized aluminum |
| Hardware | Grade 8 / Class 10.9 — castle nut at high-vibration load points |
| Lubrication | Pre-threaded Zerk housing, greaseable, pre-greased, gull-winged grease grooves |
| Reversible | Yes — supports flipped drag link applications for taller lifts |
| Lift Range | 2–6" |
| Weight | 22 lbs |
| Wide Track | Not compatible |
| BDS Adjustable Trackbar | Not compatible — adjustment collar occupies same space as clearance bends during steering cycles |
| Fox ATS / Fox TS Stabilizers | Not compatible — clamping profile conflicts with bar geometry |
| High Mount Stabilizer | Must mount in OE position at taper hole on pitman arm side drag link end |
| Dual Stabilizer Kits | May require modification to fit |
| Minimum Engagement Mark | Must stay hidden after adjustment — visible mark indicates unsafe thread engagement |
| Alignment Required | Yes — full front-end alignment mandatory post-install |
| Install Difficulty | Intermediate — professional alignment required |
| Warranty | Apex Chassis manufacturer warranty — 90-day registration required for full coverage |
| Country of Origin | United States |
| Sold As | Each — drag link only |
What Is and Is NOT Included
| Item | Included |
|---|---|
| 1.75" black anodized aluminum drag link assembly | ✓ |
| ProLock washers and proprietary jam nuts with set screws | ✓ |
| Grade 8 / Class 10.9 hardware | ✓ |
| Installation sheet with torque specs | ✓ |
| Tie rod | ✗ NOT included — sold separately as KIT372-BLK |
| Steering stabilizer | ✗ NOT included — confirm OE-position compatibility with your existing stabilizer |
| Track bar relocation bracket | ✗ NOT included — recommended separately for lifts exceeding 4" |
| Dropped pitman arm | ✗ NOT included — may be required for lifts exceeding 4" |
KIT373-BLK vs. KIT373-STL — Choose Your Material
| SKU | Adjusting Rod | Finish | Notes |
|---|---|---|---|
| KIT373-BLK (this listing) | 1.75" black anodized aluminum | Anodized black | Lighter weight; some flex and memory under extreme impact |
| KIT373-STL | 1.75" DOM SAE 1020 steel | Matte black powdercoat | Heavier; no flex or memory under impact |
For maximum rigidity under extreme off-road impacts, the STL variant eliminates the flex characteristic of aluminum. For most lifted daily/tow/trail applications, the BLK aluminum version delivers the same steering correction at reduced weight.
Drag Link Only vs. Complete Master Kit
| SKU | Contents | Best For |
|---|---|---|
| KIT373-BLK (this listing) | Drag link only | Tie rod already upgraded or confirmed in good condition |
| KIT372-BLK | Tie rod only | Drag link already upgraded or confirmed in good condition |
| KIT375-BLK | Drag link + tie rod bundled | Both components need replacement — one install, one alignment |
Verified Fitment — 2017–2026 Ford F-250/F-350 Super Duty 4WD
| Vehicle | Years | Status |
|---|---|---|
| Ford F-250 Super Duty 4WD — standard track | 2017–2026 | ✓ |
| Ford F-350 Super Duty 4WD — standard track SRW | 2017–2026 | ✓ |
| Ford F-250/F-350 Super Duty — wide track configuration | 2017–2026 | ✗ Not compatible |
| Ford F-250/F-350 Super Duty — 2WD | Any | ✗ No solid front axle or drag link on 2WD platform |
| Ford F-250/F-350 Super Duty P221 | 2005–2016 | ✗ Different platform and steering geometry — order KIT371-BLK |
| Ford F-450/F-550 | Any | ✗ Different platform |
| Ford F-150 / GM / Ram / Toyota | Any | ✗ Not compatible |
Critical Compatibility
| Configuration | Notes |
|---|---|
| Wide track Super Duty | Not compatible — confirm standard track width before ordering |
| BDS Adjustable Trackbar | Not compatible — adjustment collars physically bind against clearance bends during deep steering cycles |
| Fox ATS / Fox TS stabilizers | Not compatible — clamping profile conflicts with bar geometry; use OE-style Fox 2.0 or Carli high-mount instead |
| Dual steering stabilizer kits | May require modification to fit — confirm before ordering |
| High mount steering stabilizer | Must mount in OE position at taper hole on pitman arm side drag link end |
| Minimum engagement mark visible after adjustment | Indicates unsafe thread engagement — may require a flip kit or sleeve adjustment redistribution between ends |
| 2005–2016 Super Duty P221 | Does not fit — completely different steering geometry, order KIT371-BLK |
| Lifts exceeding 4" | Track bar relocation bracket strongly recommended; verify pitman arm drop compatibility |
Common Questions
What does the "BLK" suffix mean — is this steel or aluminum?
Black anodized aluminum. The KIT373 family comes in two materials: BLK = black anodized aluminum, STL = DOM SAE 1020 steel with matte black powdercoat. Both are 1.75" diameter. Choose STL if you want zero flex and maximum rigidity under extreme impact; choose BLK for the same steering correction at reduced weight.
Will this fix bump steer and wander on my lifted 2017–2026 F-250 or F-350?
Yes, on 2–6" lifted applications in most cases. By correcting the drag link back to its operational geometry threshold, it removes the feedback loop causing wander and bump steer on the P558/P702 platform. Full alignment required post-install to complete the correction.
Why can't I run this with my BDS adjustable trackbar?
The BDS trackbar's adjustment collars physically occupy the same space as the precision clearance bends in this bar during deep steering cycles. They will bind — this is a hard mechanical conflict, not a preference.
What's the minimum engagement mark?
A safety reference line on the drag link threads. After adjusting the sleeve, this mark must remain hidden inside the sleeve. If it's visible, the thread engagement is unsafe — the sleeve needs repositioning between the two ends, or the truck may need a flip kit.
How is KIT373-BLK different from KIT371-BLK?
KIT371-BLK is for the 2005–2016 P221 platform using 2" 7075-T6 aluminum. This unit is for the 2017–2026 P558/P702 platform using 1.75" black anodized aluminum with platform-specific clearance bends. Different generations, different geometry, different material diameter.
The Obsidian Take
The KIT373-BLK is for the 2017–2026 P558/P702 Super Duty owner who lifted the truck and is now managing the OEM drag link instead of driving through it — vague, wandering steering on a straight highway, bump steer on rough pavement, premature front tire wear. The 1.75" black anodized aluminum construction with ProLock adjustment retention is the correct call for the standard daily/tow/trail 4WD application. For maximum rigidity under sustained extreme off-road impact, the KIT373-STL steel variant is the more conservative choice.
If your tie rod is also OEM or showing wear, the KIT375-BLK complete master kit is the smarter purchase — both corrected in one session, one alignment fee. This drag link alone is correct only if the tie rod has already been addressed. Confirm three things before ordering: standard track width (not wide track), no BDS adjustable trackbar, and no Fox ATS/TS stabilizer.
Non-Returnable Notice: Steering components that have been installed are non-returnable. Confirm wide track status, trackbar compatibility, stabilizer type, and model year before ordering.
Manufacturer Data Disclaimer: Specifications sourced from Apex Chassis's own product page and authorized distributor documentation. Input data incorrectly described KIT373-BLK material as "chromoly steel with black powdercoat" — confirmed correct material is black anodized aluminum per Apex Chassis's own finish designation system. Obsidian Forged Auto Supply is an authorized Apex Chassis dealer. Product registration within 90 days required for full warranty coverage. Manufacturer specifications are subject to change without notice.