UANOFCN U-Joint Shift Bellow Kit for Volvo Penta & OMC Cobra SX 1986–1993 — Complete Bellows, Seals & Hardware

UANOFCN's U-joint shift bellow kit 3854127 is a complete transom seal and gimbal bellows replacement designed to restore watertight connection and smooth steering for 1986–1993 Volvo Penta and OMC Cobra stern drives.

If your boat uses an OMC Cobra or Volvo Penta SX-series stern drive from the late 1980s to early 1990s, this kit supplies the rubber bellows, seals and hardware needed to renew the transom and drivetrain boots. The set fits SX variants (SX-S, SX-C, SX-R, SX-M) plus DP-S, DP-S1 and DP-SM models and includes the parts pictured so you can replace worn or cracked bellows, gimbal seals and related components in one service session.

Will this kit fit my Volvo Penta or OMC Cobra stern drive?

Check model and year compatibility first: the kit is designed for OMC Cobra and Volvo Penta stern drives built 1986–1993, covering several SX-type and DP variants. Confirm the OEM reference numbers on your old parts match any of the replacements listed to ensure a correct fit.

• Compatible with Volvo Penta SX-S, SX-C, SX-R, SX-M and DP-S, DP-S1, DP-SM
• Designed for OMC Cobra stern drives from 1986 through 1993
• Replaces OEM numbers such as 508105, 911826, 914036 and others listed
• Includes the full set of bellows, seals and accessory hardware as shown

What components are included and what do they do?

The kit contains gimbal bellows, transom seals and matching hardware to rebuild the U-joint/transom interface and protect the boat from water intrusion. Each component works together to maintain steering articulation while keeping freshwater and saltwater out of the hull and drivetrain cavity.

• Main gimbal bellows to seal around the U-joint assembly
• Transom seals and backup rings to prevent leaks at the hull entry
• Replacement clamps, screws or small fittings required for installation
• Instructions or pictured parts to guide correct placement and orientation

How difficult is installation and what should I prepare?

Installation requires mechanical familiarity and basic hand tools; many owners complete the swap during routine gearcase service or while the drive is tilted for access. Expect to remove the lower unit or tilt drive as needed to reach the gimbal area and follow torque and alignment guidance for seals and clamps.

• Tools: screwdrivers, pliers, socket set, torque wrench recommended
• Plan for drive tilt or partial removal to access bellows and seals
• Clean mating surfaces and replace any corroded fasteners during install
• Inspect U-joint and gimbal bearings while bellows are removed

Who is this for: This replacement kit is intended for boat owners, mechanics and marine service shops maintaining OMC Cobra and Volvo Penta SX-series stern drives from 1986–1993. It's especially useful if your bellows show age-related cracking, your transom area is leaking, or you want to replace multiple seals in one maintenance job to restore proper sealing and operational reliability.