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Condition notes recorded before palletizing.
2-Year Warranty
Covers block, heads and internal moving components.
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Suspension
UMI Performance Stage 5 Handling Kits ABF409-1-B
£2,472.96
incl. 20% VAT (United Kingdom) · change country
United Kingdom · Ireland · Germany · France · Netherlands · Belgium · Spain · Italy · Portugal · Austria · Czech Republic · Poland · Sweden · Denmark · Finland · Greece · Hungary · Romania · Slovakia · Switzerland · Norway
+ freight from £155.56, insured road freight, priced by delivery region
(rates)
From £2,628.52 delivered
- ISPM 15 heat-treated Euro palletized & weatherproof shrink-wrapped
- Insured European road freight delivery with hydraulic tail-lift service
- Dispatches in 1–2 business days from our UK & European Logistics Centre
- Transit typically 1–3 business days (UK) / 3–6 business days (Continental Europe)
Need a matched transmission, controls or wiring package? Speak with a parts specialist.
Details & Inspection Notes
UMI's top-tier Stage 5 kit, ABF409-1-B, uses double adjustable twin-tube shocks front and rear instead of the monotube or RideTech shocks used elsewhere in this lineup, running on Spherical Bearing/Delrin bushings rather than polyurethane. UMI builds it for classic A-Body platforms spanning several GM divisions from the 1960s and '70s era.
What's in the kit
A solid 1.25" front sway bar is matched to a solid, adjustable 1.00" rear sway bar, and both the control arms and trailing arms are tubular steel finished in black. A chassis stiffener is included; spindles and brake parts are not. UMI's notes list a 450 lbs./in. front spring rate for this kit.
What to check before buying
Because this is UMI's top tier in the handling-kit range, expect a more involved install than the Stage 2 kits, with double adjustable shocks that reward some time spent tuning compression and rebound. Confirm your specific A-Body model and year against UMI's fitment chart before ordering.
Common questions
Which cars is this built for? Classic A-Body models from Pontiac, Oldsmobile, Chevrolet, Buick, and GMC built in the 1960s and '70s.
Is the rear sway bar adjustable? Yes, the solid 1.00" rear bar is adjustable.
Specifications
| Feature | Details |
|---|---|
| Brand | UMI Performance |
| Manufacturer Part # | ABF409-1-B |
| Product Type | Suspension Handling Package |
| Front Coil Springs Included? | Yes |
| Rear Coil Springs Included? | Yes |
| Rear Leaf Springs Included? | No |
| Front Shocks Included? | Yes (Double Adjustable Twin-Tube) |
| Rear Shocks Included? | Yes (Double Adjustable Twin-Tube) |
| Front Sway Bar Included? | Yes (1.25” Solid) |
| Rear Sway Bar Included? | Yes (1.00” Solid, Adjustable) |
| Upper Control Arms Included? | Yes (Tubular Steel) |
| Lower Control Arms Included? | Yes (Tubular Steel) |
| Trailing Arms Included? | Yes (Upper & Lower) |
| Control Arm Material | Steel |
| Control Arm Color | Black |
| Bushing Material | Spherical Bearing/Delrin® |
| Chassis Stiffener Included? | Yes |
| Mounting Hardware Included? | Yes |
| Spindles Included? | No |
| Brake Components Included? | No |
| Quantity | Sold as a kit |
Suspension Setup & Installation Checklist
- Inspect top mounts, damper seals, bushings, and ball joints prior to fitment.
- Set initial spring preload, collar heights, and damper rebound clicks symmetrically left to right.
- Torque all suspension control arm pivot bolts while the vehicle is at resting ride height (loaded suspension).
- Perform a complete 4-wheel laser alignment once ride height has settled to ensure optimal handling and tire wear.
Full terms: 30-day warranty · returns
