GHmarine Transom Bellows Kit for MerCruiser Bravo I/II/III (1988+) — Complete Bellows & Gimbal Bearing Repair Kit

GHmarine's 8M0095485 Transom Bellows Kit is a complete replacement set engineered to restore seal integrity and driveline alignment on MerCruiser Bravo I/II/III and compatible Stern Drives from 1988 and up.

When a worn bellows or failed gimbal bearing leads to water intrusion, vibration, or difficulty shifting, replacing the whole transom bellows assembly prevents recurring leaks and keeps your stern drive operating smoothly. This kit includes the parts most commonly lost to age and wear—u-joint bellow, exhaust components, gimbal bearing, clamps, and the outdrive gasket set—so you can perform a thorough, like-for-like restoration without hunting down multiple part numbers.

What exactly comes in this transom bellows kit?

The kit supplies all primary components needed for a full transom bellows service on compatible MerCruiser and Sierra stern drives. Items are chosen to replace the usual wear points and to simplify installation.

• U-joint bellows and shift cable bellows to seal moving joints
• Exhaust bellow and exhaust tube to route exhaust away from the transom
• Gimbal bearing to support the driveshaft and reduce vibration
• Bellows clamps, clips, water intake hose and an outdrive gasket set for leak-free assembly

Which engines and serial ranges does this fit?

This GHmarine kit is matched to Bravo I/II/III stern drives from 1988 onward and covers specific serial ranges and models for proper compatibility. It also fits select MerCruiser Blackhawk units from the mid-1990s.

• Bravo I/II/III 1988 & up, serial range from 0B664190 and up
• MerCruiser Blackhawk 1994–1995, serial range from 0D469859 and up
• Replaces OEM part numbers such as 30-803100T1, 8M0095485, Mallory 9-72903/9-72907, Sierra 18-8212

How will replacing these parts affect boat performance?

New bellows and a fresh gimbal bearing restore watertight seals and drivetrain support, which reduces the risk of transom flooding, diminishes vibration, and improves shift response. Servicing all related components together prevents premature failure of newly installed parts.

• Reduces water ingress risk by restoring proper seals
• Improves driveline alignment for smoother power transfer
• Decreases vibration and wear on connected components
• Enables reliable exhaust routing and shifting performance

What should I check before ordering and installing this kit?

Confirming the engine model and serial range ensures you receive the correct kit. Also inspect surrounding hardware and the transom for corrosion or damage that might require additional repair before reassembly.

• Verify your stern drive model (Bravo I/II/III or Blackhawk) and serial number
• Compare OEM part numbers listed to your current components
• Assess transom condition and related hoses or clamps for replacement

Who is this for: This GHmarine 8M0095485 Transom Bellows Kit is built for boat owners, DIY mechanics, and professional marine technicians working on MerCruiser Bravo series or compatible Sierra drives who need a comprehensive, OEM-compatible replacement of bellows, gimbal bearing, and associated hardware. It suits vessels showing bellows cracking, exhaust leaks, shifting issues, or signs of driveline vibration and is intended for users comfortable with stern drive servicing or for shops performing scheduled maintenance.