What is the engagement like with a Stage 4 clutch?

A Stage 4 clutch, especially one with a multi-plate design and high-performance friction material, will have a very firm and strong engagement. The sprung hub in this SPEC kit helps to absorb some of the initial shock, making it more manageable than a solid hub setup.

Do I need to replace my flywheel when installing this clutch kit?

It is highly recommended to inspect your flywheel during clutch replacement. Resurfacing or replacing the flywheel is often necessary to ensure proper clutch operation and longevity, especially with a high-performance clutch.

What is the break-in procedure for this clutch?

After installation, it's important to follow the manufacturer's recommended break-in procedure. This typically involves a series of gentle accelerations and decelerations without hard shifts or excessive slipping to allow the clutch surfaces to mate properly.

Specifications

Brand: SPEC
Part #: SB154

Spec 85-88 BMW 535 3.5L Stage 4 Clutch Kit

Name: Spec 85-88 BMW 535 3.5L Stage 4 Clutch Kit
Brand: SPEC
SKU: spec-spec-85-88-bmw-535-3-5l-stage-4-clutch-kit-t14-191324
Price: 575.10 USD
Availability: BackOrder

$575.10

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1978-1988 BMW 535i, 535is, 733i. SPEC Stage 4 clutch kit for high horsepower applications.

Key Features

Fits 1978-1988 BMW 535i, 535is, and 733i.
Stage 4 clutch kit with a sprung, multi-plate design.
Features high-performance friction material for strong engagement.
Sprung hub design helps absorb engagement shock.
Designed to handle significantly increased torque and horsepower.
Includes the necessary components for a complete clutch replacement.

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About this part

Product Details

This SPEC Stage 4 clutch kit is built with a sprung, multi-plate design, meaning it uses multiple clutch discs working together to handle significant increases in torque and horsepower. This setup is specifically tuned for the 3.5L engine found in your 1978-1984 BMW 733i, as well as the 1985-1988 535i and 1988 535is models. If you've modified your engine for more power, or plan to, this clutch is designed to put that power down reliably without slipping.

The Stage 4 kit features a high-performance friction material that offers a very strong engagement, crucial for transferring the power from a modified engine to the drivetrain. While engagement is firm, the sprung hub design helps to absorb some of the shock, making it more manageable for daily driving than a solid hub setup. This kit is a popular choice for enthusiasts looking to significantly upgrade their vehicle's drivetrain capacity. It's a well-built system designed for those who demand more from their clutch.

When installing a high-performance clutch like this, it's important to ensure your flywheel is in good condition, or consider resurfacing or replacing it. This kit is designed as a direct replacement for your stock clutch assembly, simplifying the installation process. You'll want to follow the manufacturer's recommended break-in procedure after installation to ensure the clutch surfaces mate properly and achieve their full lifespan and performance potential.