Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Suspension and Components› Suspension Kits
ProComp
BOX 3 6IN - 99-09 GM 2500HD 4WD
SKU: P020 51801B-3
Advanced — 4+ hours
Overview
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Part #: 51801B-3
Since 1992, Pro Comp USA has been manufacturing high-quality, durable products for On- and off-road enthusiasts including tires, wheels, suspensions, shocks and more. Suspension systems were our original foundation and they continue to be one of our strongest departments as we develop innovative new suspensions to this day. Pro Comp USA chooses to focus on suspensions, wheels and tires for a simple, effective and affordable shopping experience. Featuring a no-hassle, user-friendly approach to finding the right parts for your vehicle, Pro Comp USA sticks to the basics to deliver what you need as quickly and affordably as possible.
Features:
- Component Box
BOX 3 6IN - 99-09 GM 2500HD 4WD
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | ProComp |
| Part Number | P020 51801B-3 |
Videos
About MOTORMIA
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Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.
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