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Overdrive Lubrication 1. The overdrive is shipped without transmission fluid in the unit. Remove the 13mm fill plug on the back right side of the overdrive and add approximately 26 ounces of synthetic manual transmission fluid (GM part #12346190 or Mopar #0487-4459). Fill to the bottom threads of the plug. Gear Vendors specifically recommends GM# 12346190, or Mopar #0487-4459, and it should not be substituted. Gear Vendors previously recommended Dexron II automatic transmission fluid for its overdrive units. It now recommends the GM synthetic manual transmission fluid for its overdrive units due to improved shift characteristics, and less thinning at temperature than Dexron automatic transmission fluid. Gear Vendors recommends that current installations of their overdrive change to the GM or Mopar synthetic manual transmission fluid. 2. Lubricate the splined coupling at the rear of the overdrive housing. There is a 1/8” plug on top of the unit and one on the right side of the housing at the 9 o’clock position (Photo 14). Add gear oil through the top plug until it reaches the level of the plug on the side. This should be added to your routine chassis lubrication since the installed overdrive prevents oil from the sphere reaching the splined coupling and intermediate bearing behind the overdrive. Steve Litman made a copper pipe assembly that extends the flexible oil line on a Springfield Ghost from its original location on the torque tube to the top of the overdrive housing. The line was connected through the existing 1/8” pipe plug on top of the overdrive.
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Section 1 - Disconnecting Torque Tube |
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