The only gasket is the one for the Overdrive since it shares fluid with the trans. Use a little hand pump affixed to the top of the quart oil bottle. Now I have to invent a method for filling the unit via the drain hole instead! It is possible to fill the transmission through the shifter hole if the fill plug is completely stuck. Mine is frozen in and I already have drained the old juice out the drain plug below. Before draining anything, make sure you can loosen and remove the FILL plug. Replace the fill plug after first placing antiseize on the threads. When you have the plug out, stick a finger into the opening and see if you can feel the oil. If worse comes to worst, weld a 17mm bolt on to the plug. This is specially a problem with the aluminum case M47. Sometimes the plug will be frozen into the tranny and will be rounded off with a 12-point socket or, worse yet, a Crescent wrench. NOTE: I recommend you use only a 6-point socket on this plug. Clean the dirt away from the upper plug and unscrew the plug. The lower is the drain plug, the upper is the fill plug. There you'll see two plugs screwed into the side of the tranny. To check the oil level, put the car on jack stands or ramps (safety first!!) Look at the driver's side of the tranny. The over fill with 2 quarts seems to work. The word on the street is that the M-47 fill hole is two low, so the 5th gear eventually wears out. By jacking up the driver's side, you can insert all 2 quarts, overfilling slightly above the fill hole's normal line and ensure that fifth gear has more than adequate lubricant. After that point is reached, the tranny will go down hill fast. The heat will eventually deteriorate the fluid so it no longer lubes well. You will end up with metal on metal as you drive, increasing wear and heat. It does not have the resistance to squeeze out or the cling necessary to stay between the gears as they mesh.
Pressure gauge for laycock overdrive manual#
Dextron or Mercon ATF is NOT usable in manual transmissions not designed for that fluid. Northern locations and winter eliminate the 30W oil option since you regularly get below the 10 C low point for the oil option. According to Duane Hoberg, I should stick with a product without friction modifiers, and of the type directly recommended. Shifts the best of any fluid I have tried. I pumped in the new synthetic Type F ( Amsoil Supershift Racing Transmission Fluid product # ART.). It takes about 2.4 quarts if you can get it all out. The M46/M47 transmissions require Type F auto tranny fluid: NOT Dexron.
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Manual M-46 Laycock Overdrive Unit: Basic Operation VOC Home | FAQ Home Manual Gearbox or Transmission and Clutch Maintenance