I too did not have any lubrication plates on my transmissions but I just found one in the spare parts bin. Mine take 1.7 gallons and are 1991 vintage behind 3208 Cat's Here's what the plate basically says: >>>>>>>>>>>> MARINE TRANSMISSION LUBRICANT OIL SERVICE CLASS - USE SAE-API SERVICE CLASS CD ENGINE OIL CERTIFIED BY VENDOR TO PASS TC-2 OIL TEST ALSO APPROVED ARE SAE-API SERVICE CLASS CC ENGINE OIL MIL-L-B AND TRANSMISSION FLUID TYPE C-3 VISCOSITY - BASE SELECTION ON SUMP TEMPERATURE STARTUP - 32 DEGREES MINIMUM RUNNING - 150 -185 DEGREES USE SAE 30 OR - 174 - 210 DEGREES USE SAE 40 >>>>>>>>>> Hope that helps Jim on GB 46 "TWINS" (Anchored on the Tennessee)