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Suspension and Components› Suspension Kits

UMI

Weight Jack Kit Components

Name: Weight Jack Kit Components
Brand: UMI
SKU: 206575

$1,031.99 $834.19 Save $197.80

SKU: 206575

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Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The UMI Performance weight jack kit is a front and rear suspension component designed for 1982-1992 GM F-Body models. It offers adjustable ride height, allowing for a drop of 0 to 2-1/2 inches, and is suitable for various driving conditions from daily driving to road racing. The kit includes custom wound springs and is constructed from strong, USA-made steel with a powder coat finish.

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The UMI Performance weight jack kit is engineered for the 1982-1992 GM F-Body platform, providing a medium-firm ride that excels in daily driving, corner carving, auto-x, and road racing applications. Constructed from strong US Steel with a 1/4" thick, CNC laser-cut design, this kit ensures durability. It features UMI's exclusive thrust bearings on the jack plates for smooth and even load distribution, allowing for ride height adjustment from stock to a 2-1/2" drop, with most track testing performed at a 2" drop. The kit offers two spring rate options: 850 lb/in front and 175 lb/in rear for daily driving and street cornering, or 1050 lb/in front and 200 lb/in rear for more aggressive performance driving. The rear kit is compatible with factory and Strange Engineering rear housings, while the front kit fits UMI and factory K-members. Manufactured in the USA, this kit boasts acme threads and thrust bearings for effortless ride height adjustments, typically managed with a ratchet and 3/4" socket. The design incorporates an anti-rotation tab and allows for independent corner weight tuning, a critical feature for optimizing auto-x handling. It maintains factory clearance around the strut, maximizing tire and wheel width potential. It is important to note that while the front kit fits UMI and factory K-members, it may not be compatible with other brands.

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	UMI
Part Number	206575
Category	Suspension and Components

Videos

Installing UMI Performance Road/Race K Member & QA1 Coilovers!

Lowering an 1987 IROC-Z with UMI Performance suspension and springs!

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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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Shipping

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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