The factory rear track bar is the only thing locating the GMT800's axle side-to-side — and after 20+ years its rubber bushings are worn, letting the axle wander. Our Cruise RTB1 swaps it for 1.5" OD, 5/16" wall DOM tubing — seamless, cold-drawn for tighter tolerances and higher strength — with fresh poly bushings at both ends and adjustable length to recenter the rear axle after a lift or leveling kit.
The Yukon XL Denali handles long-haul work — heavy loads, big trips, plenty of highway miles. After a couple decades, the rear suspension is showing its age, and the fixed-length arms leave you no way to re-align the rear axle after a lift. You feel it as a clunk under throttle, harshness over expansion joints, and a back end that floats when it's loaded. Switching to Core 4x4 brings the rear back where it should be — with stronger, more durable construction built in.
Quick Specs
Tubing: 1.5" OD, 5/16" wall DOM
Bushings: Poly, both ends
Lift range: 0"–6"
Tier guide — Cruise (entry, this product) → Camp (mid, our most popular tier) → Crawl (top, extreme off-road, heavy towing, or high-HP builds). Cruise handles factory-power daily driving — lifted or not — and still outperforms much of the competition. Step up to Camp for serious trail and off-road use, or Crawl for extreme use, heavy towing, or high-HP builds — Johnny Joints handle that load better than bushings.
Hardware included — Every order ships with the bolts, nuts, and washers you need to install. You don't need to reuse factory hardware or order anything extra. Replacement hardware is available as a standalone HWK SKU if you ever need more.
Pairing tip — This track bar is part of our 5-piece rear suspension kit — step up to the 5-piece kit to add the four rear control arms and re-align the rear axle in every direction.
Fitment: GMC Yukon XL Denali (2001-2006). Also fits Chevy Tahoe (00-06), Chevy Suburban 1500 (00-06), Chevy Avalanche 1500 (02-06), GMC Yukon 1500 (00-06), GMC Yukon XL 1500 (00-06), GMC Yukon Denali (01-06), Cadillac Escalade (02-06), Cadillac Escalade ESV (03-06), Cadillac Escalade EXT (02-06). 1500-series only — does NOT fit 2500-series HD trucks. Made in the USA. Lifetime warranty on construction.
Built With
Tubing: 1.5" OD, 5/16" wall DOM · Fixed end: Poly bushing · Adjustable end: Poly bushing
| Make | Model | Submodel | Years |
|---|---|---|---|
| GMC | Yukon XL Denali | 2001 - 2006 |
Construction & Materials
Tubing: 1.5" OD, 5/16" wall DOM · Fixed end: Poly bushing · Adjustable end: Poly bushing
| Brand | CORE 4X4 |
| Color | Black or Blue or Charcoal or Green or Light Green or Orange or Purple or Red or White or Yellow |
| Lift Size | 0" — 6" |
| Series | Cruise Series |
| Mounting Style | Bolt-On |
Use the vehicle selector on our website to shop by your year, make, and model. On product pages, use the kit builder to select your color, series, lift height, and any add-on options, then add to cart. If you need help, call or email our team.
Standard orders typically ship within 1–3 business days of ordering. Custom color orders take approximately 5–10 business days. Because everything is built in-house, we can turn orders quickly even for custom specifications.
You can reach our team through the contact form on our website, or browse to the Contact Us page. Our team is available to answer pre-sale and technical questions before and after your purchase.
Reviews of Core 4x4
