6404 – 1973-1987 GM C10 Handling and Lowering Kit, Stage 4

UMI’s Stage 4 Kit transforms your squarebody with a 4.5″/6″ drop, #cornermax A-arms, coilovers, and Viking shocks. Tunable for street or track, it improves handling, stance, and control while retaining stock brakes. Made in the USA.

Details

UMI’s Stage 4 Handling and Lowering Kit takes your squarebody to the next level of performance and drivability. Engineered for serious enthusiasts, this complete package combines #cornermax upper and lower A-arms to increase caster and improve straight-line stability while enhancing cornering precision. A tall upper ball joint improves camber gain for superior tire contact and predictable handling, and the design allows the shock and spring to be removed at the track without disassembling the spindle for quick and easy setup changes. The UMI/Viking coilover system paired with CP4S4 drop spindles delivers a full 4.5″ front drop with adjustable ride height and spring rate tuning for ultimate control, while the lowering spindles retain stock GM brakes and bearings for simple installation and serviceability. A heavy-duty 1-3/8″ tubular front sway bar keeps body roll in check, and the UMI rear flip kit provides a 6″ rear drop for a level, aggressive stance. Out back, a three-way adjustable 1″ Pro-Tour style sway bar allows fine-tuning of rear roll stiffness, working together with Viking double adjustable shocks to balance street comfort and track capability. Whether it’s the Power Tour, your daily commute, or an autocross course, this kit delivers proven results. Proudly Made in the USA, UMI’s Stage 4 kit combines a 4.5″/6″ drop with advanced geometry and precision components to transform your squarebody into a true corner-carving machine—with the looks, stance, and performance to match.

Description

Stage 4 Kit: 4.5″/6″ drop, #cornermax A-arms, coilovers, Viking shocks.

Short Description

Handling Kit

Notes

Advanced Air Systems, Inc., DBA Power Tank, designed the original CO2 on-board air system back in 1997. It all started after Steve's first wheeling trip in his red 85 4Runner. He was new to the sport and as he got off the trail after a weekend of fun, his first question was, How do we get home on aired down tires?

The two solutions at the time? 1. Plug a little compressor into your cigarette lighter and wait for it to run (too late for that) or 2. drive down the road until you see a gas station with tire refill station. Well by the time Steve and his buddies found a viable gas station, his tires had already cupped. Brand new M/Ts were ruined after one outing.

Steve talked to his brothers in the refrigeration industry and did some research on his own to see if CO2 could be the answer to his problems. He soon developed the first Power Tank in his garage out of the need for a fast, simple, and affordable tire inflation system for 4x4 trail rigs.

What Steve ended up with was an on-board air system with capabilities beyond his wildest expectations. It ran air tools, was easily portable, very affordable, easy to install, AND inflated tires faster than a 6 HP shop compressor. He named it the Power Tank.

He put out an ad in a 4WD magazine and orders started coming in. Slowly at first but momentum built and soon he took the chance to leave his current job to focus on Power Tank full time.

Over more than 20 years, Steve has been building and improving that original concept and here we are today. Power Tank now has a full catalog of air systems and accessories to support a variety of industries such as Construction, Motor Homes, Sand Sports, Towing, Desert Racing and more.

At the heart of every Power Tank system is a regulator sporting SuperFlow technology designed to provide super high flow rates of CO2 vapor without freeze clogging, the number one problem with other high pressure CO2 regulators, or self-destructing due to sub-freezing temperatures subjected to internal components. It is the only air system with a limited lifetime warranty.

Our main focus is still in the off-road market but Power Tanks can now be found around the world in the UK military, municipalities using them to test remote pipe lines, all manner of race teams, the US Forest Service, agricultural tractors, and even on the Discoverer-Enterprise deep sea vessel!

The Power Tank product line has also expanded over the years. Propane tank brackets, Ventoso Tire Inflators, Shock Boss Shock Inflation Tools, and more.

Application Summary

Broke a gauge on your Power Tank regulator? You've come to the right place. These gauges are a direct fit replacement on any Power Tank Super Flow regulator regardless of age. 3000 psi Top Gauge Details: 1.5 in. diameter 1/8 inch NPT threads Silicone filled Rubber Boot

Features

• UMI #cornermax upper and lower a-arms increase caster and improve straight line stability
• Tall upper ball joint improves camber gain
• Remove shock and spring at the track without disassembling the spindle
• UMI/Viking coilover and CP4S4 spindle lower the front 4.5″ with ability to fine tune ride height and spring rate
• Lowering spindles accept stock GM brakes and bearings
• Heavy duty 1-3/8″ tubular front sway bar
• UMI flip kit on rear axle yields a 6″ drop
• Three way adjustable 1″ Pro-Tour style rear sway bar
• Viking double adjustable shocks work great on street or track
• Power Tour, daily driver and corner carver proven
• Made In USA

Product Info

Available Packages

Fitment