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Thread: Cleaning and flushing the transmission

  1. #1
    Champion Member
    Join Date
    Sep 2013
    Andover, KS

    Cleaning and flushing the transmission

    The shop manual for the 1951 Passenger Car ( I'm working on '52 Land Cruiser, T86 with overdrive) says to "drain, flush, fill" the transmission every 10,000 miles. It identifies the appropriate oil for the transmission, S.A.E. 90 high grade mineral oil gear lubricant, but what is the appropriate fluid to flush it and to flush the OD unit? I have the transmission opened up sitting on my bench and would like to clean it up as much as I can without disassembling it. What is the best/safest way to clean the old oil residue off the gears that I have access to? Pete

  2. #2
    President Member
    Join Date
    Apr 2005
    I drained and put in ~ 2+ pints of kerosene, up on jack stands and @ idle..... shifted into all the gears, including OD (may not need this).... then drained and filled both boxes with GL-1 from NAPA.....that was ~ 5K miles ago..... so far, so good....comments ??

  3. #3
    Silver Hawk Member
    Join Date
    Jun 2006
    Spokane, WA, USA.
    Diesel fuel is also an excellent solvent for gearboxes.

    jack vines

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