Borg-Warner / Velvet Drive Clutch Belleville Spring 3-37 | Forward Clutch | 71C / 72C Transmission
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Part Details
- Part Number: 3-37
- Brand: Borg-Warner / Velvet Drive (OEM)
- Official Product Type: Clutch Belleville Spring — Forward Clutch Assembly
- Alternate Reference: ALT23767
- Transmission Models: Velvet Drive 71C / 10-17 and 72C / 10-18
- Quantity Required: 1 spring per transmission
- System: Forward clutch assembly — marine transmission
- Weight (approx.): 100 g / 0.22 lb
What This Part Is
Borg-Warner 3-37 is the Belleville spring used in the forward clutch assembly of Borg-Warner / Velvet Drive 71C and 72C marine transmissions. It sits between the clutch spring bearing ring (5C-33) and the forward-clutch snap ring (4755), applying spring force that helps release the forward clutch pack when hydraulic pressure is removed. One 3-37 spring is used per transmission in both the 71C and 72C assemblies.
Compatible Applications
- Velvet Drive / Borg-Warner 71C / 10-17 marine transmission — forward clutch assembly
- Velvet Drive / Borg-Warner 72C / 10-18 marine transmission — forward clutch assembly
- Corresponding 71C / 72C V-drive configurations using the same forward-clutch arrangement
Fitment Notice — Forward vs. Reverse Clutch
The 3-37 is the forward clutch Belleville spring only. The reverse clutch assembly on the same transmission uses a bank of individual pressure-plate springs — these are separate parts and are not interchangeable with 3-37. Confirm by locating 3-37 in the forward clutch section of the exact 71C or 72C parts diagram for the transmission being serviced. Do not match by appearance alone.
Forward Clutch Stack — Diagram Position
In the documented forward clutch assembly, 3-37 is installed in this sequence:
- Forward clutch piston
- 5M-122 O-ring
- 5L-36 piston sealing ring
- 5C-33 clutch spring bearing ring
- 3-37 clutch Belleville spring ← this part
- 4755 snap ring
- 5C-175A clutch pressure plate
- Forward steel and friction clutch plates (3-176 steels / 5C-A66A frictions)
When This Part Needs Replacement
Inspect the Belleville spring whenever the forward clutch assembly is dismantled. Replace if the spring shows:
- Cracking or fracture
- Permanent flattening or loss of spring tension
- Distortion or uneven profile
- Heat discoloration from clutch-pack overheating
- Corrosion or pitting
- Damage resulting from clutch-pack failure
Installation Notes
- Install the Belleville spring in the correct orientation specified in the Velvet Drive 71C / 72C service manual — incorrect orientation affects clutch release
- Do not replace the spring in isolation — inspect the complete forward clutch pack during overhaul
- Check the forward piston, O-ring, sealing ring, bearing ring (5C-33), snap ring (4755), pressure plate (5C-175A), steel clutch plates, and friction clutch plates for heat damage or wear
- Replace all sealing components any time the piston is removed
Cross-Reference Part Numbers
- Borg-Warner / Velvet Drive: 3-37
- Aftermarket ref: ALT23767
Related Parts
- Velvet Drive / Borg Warner Steel Forward Clutch Plate 3-176 — 71C / 72C Transmission
- Velvet Drive 71C Forward Piston Housing Bearing B107A — 10-17 / 1017
- Velvet Drive / Borg Warner Transmission Dipstick — 71C / 72C
- Browse Transmission Parts & Components for all 71C / 72C service parts
Parts Desk Insights
Best use case: The 3-37 is most commonly ordered as part of a forward clutch overhaul on a 71C or 72C transmission that has been slipping in forward gear or shows heat damage to the clutch pack. Because the spring is inexpensive relative to the labour involved in opening the transmission, it is good practice to replace it any time the forward clutch assembly is apart.
Common issue: The most frequent ordering confusion is mixing up forward and reverse clutch hardware on the 71C / 72C. The 3-37 is the single Belleville spring in the forward clutch — the reverse clutch uses a separate set of individual pressure-plate springs. Confirm which clutch side is being serviced, and verify 3-37 in the forward-clutch section of the parts diagram before ordering. If the transmission has been overheated, always inspect the forward steels and friction plates at the same time rather than replacing only the spring.
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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