Velvet Drive 71C / 72C Reduction Case Bearing B308AGS | 1000-130-018
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Velvet Drive 71C / 72C Reduction Case Bearing B308AGS
Legacy Part Number: B308AGS | Current Part Number: 1000-130-018 (also shown as 1000130018)
The Velvet Drive B308AGS (current reference 1000-130-018) is a marine transmission ball bearing used in the rear case of 71C / 10-17 direct-drive transmissions and as the intermediate case bearing on selected 71C and 72C inline-reduction transmissions. On reduction-equipped models, it sits between the main transmission case and the reduction housing, supporting the rotating assembly at that interface.
Transmission Compatibility
71C / 10-17 Direct Drive — Rear Case
- Velvet Drive 71C 1:1 direct drive
- 1017-001 / 1017-002 / 1017-003 / 1017-004
- AS1-71C / AS1-71CR
71C Inline Reduction — Intermediate Case
- 1.88:1 reduction
- 1.91:1 reduction
- 2.57:1 reduction
- 2.91:1 reduction
72C Inline Reduction — Intermediate Case
- 1.88:1 reduction
- 1.91:1 reduction
- 2.57:1 reduction
- 2.91:1 reduction
B308AGS is generally not used on 1.52:1 or 2.10:1 reduction configurations. Confirm the transmission model number and ratio before ordering.
Fitment Notice — Position and Model Matter
B308AGS is not a universal 71C / 72C rear-case bearing. Factory parts listings distinguish:
- 71C / 10-17 rear case: B308AGS / 1000-130-018 (this part)
- 72C / 10-18 rear case (1:1 direct drive): B309AGS — a different bearing
B308AGS is used in 72C applications only on reduction-equipped 72C transmissions, at the intermediate case position — not as the 72C direct-drive rear bearing. Always verify the transmission identification plate, model number, and gear ratio before ordering.
Cross-Reference Part Numbers
- Legacy: B308AGS
- Current: 1000-130-018
- Also shown as: 1000130018
When to Replace This Bearing
- Roughness or binding present during rotation
- Excess radial or axial play found in the bearing position
- Bearing noise present during operation
- Pitting, corrosion, or race damage visible on inspection
- Transmission contamination has affected the bearing
- Rear or intermediate case is being rebuilt or resealed
- Reduction-unit overhaul is being performed
Installation Notes
- Confirm the transmission model number and gear ratio from the identification plate before disassembly
- Verify whether this bearing is being installed in the 71C rear case or the intermediate case of a reduction unit — the location affects what associated hardware must also be inspected
- Inspect the bearing retainer and seating surfaces for wear or scoring
- Press the bearing squarely using appropriate bearing tools — do not press through the rolling elements
- Inspect associated snap rings, retainers, gaskets, and oil seals and replace as needed
- Verify shaft end play and transmission clearances per Velvet Drive service procedures during reassembly
Related Parts
- Velvet Drive 71C / 72C Gasket & Oil Seal Kit A4867HA
- Velvet Drive Needle Bearing — 4840D
- Velvet Drive Double Ball Bearing — 71 Series | 4920A
- Velvet Drive Input Shaft — 71C / 72VDR Series | 71C-3A16
- Velvet Drive Shift Spool O-Ring — 71C / 72C | 4804H
- Velvet Drive 5-Inch Output Coupling A4547HA | 10-Tooth Coarse Spline
- Velvet Drive 71C Forward Piston Housing Bearing B107A | 10-17 / 1017
Parts Desk Insights
The B308AGS comes up most often during 71C direct-drive rebuilds — it’s the rear-case bearing and is routinely replaced alongside the gasket and seal kit during a full overhaul. On reduction-equipped transmissions, it also appears at the intermediate case position, which means it can turn up in both 71C and 72C rebuilds depending on the ratio.
The most common ordering mistake is assuming B308AGS covers all 71C and 72C rear cases. It does not — the 72C 1:1 direct drive uses B309AGS. Customers rebuilding a reduction unit who find this bearing at the case interface are correct to use B308AGS, but those rebuilding a 72C 1:1 direct drive need a different part. The other common issue is not confirming the gear ratio first: B308AGS is not used in 1.52:1 or 2.10:1 reduction configurations, so ordering by transmission family alone can result in the wrong bearing arriving on the bench.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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