Velvet Drive 71C Reduction Main Shaft AS2-L4-2 | 1017-171-001 | 10-Spline
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Velvet Drive 71C Reduction Main Shaft AS2-L4-2 | 1017-171-001
Part Numbers: AS2-L4-2 / L4-2 / 1017-171-001 (also shown as 1017171001)
The Velvet Drive AS2-L4-2 (OEM service reference 1017-171-001) is the reduction-unit main shaft used in compatible Velvet Drive 71C / 10-17 marine transmissions. It uses a 10-spline configuration and is the correct replacement when the original shaft is worn, damaged, or being replaced during a reduction-unit overhaul. Current Velvet Drive parts catalogs identify 1017-171-001 specifically as the “Main Shaft – Reduction Unit” in the 1017 / 71C transmission family.
Compatible Transmissions
- Velvet Drive 71C — reduction-unit configurations
- Borg-Warner 10-17 / 1017 — reduction-unit configurations
Velvet Drive used different shafts across direct-drive and various reduction-gear configurations. Confirm the transmission identification tag, reduction ratio, and original shaft reference before ordering.
Fitment Notice
Before ordering, verify all of the following from the transmission identification plate and original shaft:
- Transmission family: 71C / 10-17 / 1017
- Reduction-unit configuration (not direct drive)
- Original shaft reference: L4-2 or OEM number 1017-171-001
- Spline count: 10 splines
- Reduction ratio (to confirm correct variant)
This shaft is documented specifically for the 71C / 10-17 reduction family. Cross-application to 72C / 10-18 transmissions has not been confirmed from public Velvet Drive catalog sources and should be verified against your transmission tag and internal parts reference before ordering.
Cross-Reference Part Numbers
- AS2-L4-2
- L4-2
- 1017-171-001
- 1017171001
When to Replace the Main Shaft
- Splines are visibly worn, rounded, or damaged
- Shaft journals show scoring or pitting
- Bearing surfaces are worn beyond service limits
- Shaft runout exceeds transmission specifications
- Gear or spline engagement has excessive play
- Corrosion or contamination has damaged the shaft surface
- Reduction unit is undergoing major rebuild and inspection identifies shaft wear
Installation Notes
- Confirm the transmission model number and reduction ratio from the identification plate before disassembly
- Compare the replacement shaft directly against the original — verify overall length, spline count, and journal dimensions before installation
- Inspect all 10 splines for proper mating engagement with the associated gear
- Inspect associated bearings, bushings, thrust washers, and retainers and replace any worn components
- Lubricate journals and bearing surfaces during assembly per Velvet Drive service procedures
- Verify shaft end play and transmission clearances during reassembly
- Replace any seals and gaskets disturbed during disassembly
Related Parts
- Velvet Drive 71C / 72C Reduction Case Bearing B308AGS | 1000-130-018
- 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 71C Forward Piston Housing Bearing B107A | 10-17 / 1017
- Velvet Drive 5-Inch Output Coupling A4547HA | 10-Tooth Coarse Spline
Parts Desk Insights
The AS2-L4-2 / 1017-171-001 main shaft comes up during reduction-unit rebuilds on 71C / 10-17 transmissions where shaft wear or damage is found on inspection. It is one of the higher-cost internal components and is typically replaced only when inspection confirms it is beyond serviceable limits — most reduction-unit overhauls address bearings, seals, and gaskets before a shaft replacement becomes necessary.
The most important step before ordering is confirming both the transmission model number and the original shaft number from the identification plate and disassembled unit. The old catalog title “71/72VD” has led to interchange errors — this shaft is documented specifically for the 71C / 10-17 reduction family. Do not assume it fits a 72C / 10-18 without verifying against the transmission tag. Also compare the replacement shaft physically against the original before installation, as Velvet Drive used different shaft lengths and journal configurations across reduction ratios.
*not exactly as shown
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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