AST 1977-06/1981 BMW 5 Lowering Springs – 40mm/40mm

This AST Suspension 1977-06/1981 BMW 5 Lowering Springs – 40mm/40mm is a vehicle-specific lowering spring set selected by exact part number, chassis, drivetrain, body style, suspension configuration, and stated front and rear drop. Confirm every application note before ordering.

Key Features

• 40mm Front/Rear Drop: Reduces ride height for aggressive stance better aerodynamics and cornering grip.
• Progressive Spring Design: Delivers smooth OEM-like comfort during daily driving with firmer response under load.
• Complete set includes front and rear springs as direct OEM replacements.
• Yes direct bolt-on for all listed E12 528i models front and rear no modifications needed.
• High-tensile premium spring steel coiled on Wafios CNC machines for superior strength and fatigue resistance.
• Advanced manufacturing ensures exact OEM-level precision.

Fitment

Specifications

What’s Included

One new AST Suspension product in the exact part number, dimensions, rate, adjustment specification, and quantity identified on this page. Springs, dampers, top mounts, reservoirs, adjusters, links, tools, lines, fittings, and hardware are included only when expressly stated for this exact configuration.

About AST Suspension

AST Suspension develops performance springs, dampers, coilovers, top mounts, and motorsport suspension components. Vehicle fitment, dimensions, rates, adjustment functions, and included components remain exact-part specific.

Related Parts

• Shop the complete AST Suspension collection
• Shop suspension components
• AST 03/1997-05/2004 BMW 5 Lowering Springs – 35mm
• AST 06/1981-12/1987 BMW 44931 Lowering Springs – 45mm/35mm
• AST 08/2010-10/2016 BMW 5 XDRIVE Lowering Springs – 35mm/30mm

Frequently Asked Questions

How do I confirm these springs fit my vehicle?
Match the exact year, make, model, chassis, drivetrain, body style, engine, factory suspension, axle-load notes, and AST part number.

Will I need an alignment after installing lowering springs?
Yes. Measure ride height after the springs settle, then perform a complete alignment and verify tire, wheel, brake-line, and suspension clearance.

Can these springs be used with factory dampers?
Only when the exact AST application permits it. Check damper condition, available travel, bump-stop requirements, and every product-specific suspension note.

Is the advertised drop exact on every vehicle?
The stated drop is a target for the listed configuration. Actual ride height can vary with equipment, vehicle weight, spring isolators, damper condition, and prior suspension changes.

Installation Instructions

1. Confirm the exact AST part number, complete application or dimensional specification, included components, and current instructions before disassembly.
2. Support the vehicle at approved points and record the original ride height, alignment, suspension orientation, and adjustment settings.
3. Install components in the specified position and sequence using correct spring-compression, torque, preload, ride-height, and damper setup procedures.
4. Verify full suspension and steering travel, tire and wheel clearance, brake-line routing, fastener torque, and damper operation.
5. Settle the suspension, measure final ride height, complete a professional alignment, and recheck the installation after the initial driving cycles.