Product Details

New neutral safety switch for Velvet Drive, Borg Warner, ZF, and Hurth marine boat transmissions. This is an OEM switch from Velvet Drive, part number 1000-640-004 (1000640004). Exact replacement for ZF 3312308029. These take an 7/8″ wrench to install. View the below chart for applications.

Applications

Velvet Drive Borg Warner	71C Series 72C Series 73C Series 5000 Series Liberty Series
ZF	45A 63, 63A, 63IV 80A, 80IV 85A, 85IV
Hurth	HSW 450A, HWS 450D HSW 630H, HSW 630A, HSW 630V HSW 800A, HSW 800V, HSW 800A3

There is also a larger, older style neutral safety switch used on older Borg Warner transmissions, which uses a 1-1/8″ wrench to install. If you have this one, you may want to consider converting to the new style using the 1004-420-052 kit.