Overdrive Service

 The fluid level in the overdrive should be checked periodically.  The fluid should be changed every 15,000 miles. 

 The transmission fluid is drained by removing the small hex plug on the bottom rear of the sump (Photo 21).    Refit drain plug.  Refill with synthetic transmission fluid (GM part # 12346190 or Mopar #0487-4459) to the bottom threads of the drain plug (capacity – approximately 26 ounces).

 Dave Browne suggests that you periodically remove the sump pan on the bottom of the overdrive to clean out the internal filter.  The sump pan is held on by six 11mm bolts.  Pull the suction filter (Photo 22) straight down, wash the screen and air dry.  Install the suction filter by pressing in to seat.  Refit sump pan cover and renew the gasket if damaged.  Refit drain plug.  Refill with synthetic transmission fluid.

 Lubricate the grease fitting on the right angle speedometer multiplier adapter if fitted.

 Check the wiring connections for integrity, particularly the two wires connecting the solenoid on the bottom of the overdrive unit since they are the most exposed to road debris.s.

Section 1 - Disconnecting Torque Tube
Section 2 - Removing the Front Section of the Torque Tube
Section 3 - The Mathematics of an Overdrive
Section 4 - Checking Universal Joint and Bearnings
Section 5 - Installing Overdrive in Drive Line
Section 6 - Overdrive Lubrication
Section 7 - Connecting Speedometer and Electric Controls
Section 8 - Hooking up the Electronic Control Box
Section 9 - Hooking up Speedometer and Calibrating Output
Section 10 - The Overdrive in Operation
Section 11 - Overdrive Service
Section 12 - Crusing in Overdrive
Endnotes - Endnote
Table 1 - Silver Ghost Rear Axle Gear Ratios Comparisons
Table 2 - Engine Revolutions per Tire Turn
Table 3 - Overdrive Speedometer Gears for the Silver Ghost