The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Exploded or cross-section illustration of GOVERNOR for Borg Warner Overdrive?

TxCajun · 10-14-2020, 03:12 PM

Rocknrod,

That's pretty interesting, but the GOVERNOR shown in that second document is a "hydraulic" governor or pressure regulator used in a Borg Warner hydraulically actuated overdrive. (I actually have one of those in a '64 Triumph TR4 that I am renovating.)

However, the overdrive used with the Saginaw 3 speed in the 50s through 70s Chevys is electrically actuated by a solenoid. In this case, the GOVERNOR provides a connection to ground for the solenoid only when a certain transmission tail-shaft speed is reached, equivalent to about 28 miles per hour. The GOVERNOR has some rotating weights that are driven out and upwards by centrifugal force, pushing a shaft that actuates a spring loaded switch to make the circuit.

Thanks for the info.

Regards,

10-14-2020, 03:12 PM	#5
TxCajun Registered User Join Date: Sep 2017 Location: Cedar Park, Tx Posts: 209	Re: Exploded or cross-section illustration of GOVERNOR for Borg Warner Overdrive? Rocknrod, That's pretty interesting, but the GOVERNOR shown in that second document is a "hydraulic" governor or pressure regulator used in a Borg Warner hydraulically actuated overdrive. (I actually have one of those in a '64 Triumph TR4 that I am renovating.) However, the overdrive used with the Saginaw 3 speed in the 50s through 70s Chevys is electrically actuated by a solenoid. In this case, the GOVERNOR provides a connection to ground for the solenoid only when a certain transmission tail-shaft speed is reached, equivalent to about 28 miles per hour. The GOVERNOR has some rotating weights that are driven out and upwards by centrifugal force, pushing a shaft that actuates a spring loaded switch to make the circuit. Thanks for the info. Regards, __________________ Wampus Cat Build: http://67-72chevytrucks.com/vboard/s...d.php?t=759550