Topic: 600 W gear lube really necessary in a '41?


martin.scheffer@gmail.com    -- 09-14-2022 @ 9:21 AM
  Recent inductee to early Ford lore with a purchase of a 1941 would like to know more about the need to use 600 weight gear lube in the tranny and diff. Got a qt. from C&G parts - expensive, and of course pretty thick to even pump in. My Ford Reference Book says to use 90 in winter and 120 in summer, but both C&G as well as MAC's catalogs call for 600 W and my Ricks V8 Shop manual states "use no other" including in steering box. Anxious to read your recommendations.


marko39    -- 09-14-2022 @ 10:37 AM
  No need for that stuff in Tracy or diff. For tranny use a GL4 lube either 90 or multi grade. Diff can take GL5 but can use what you put in tranny. I got my lube on Amazon. The 600 is probably ok for the steering box and some like the corn head grease for that.


42wagon    -- 09-14-2022 @ 11:31 AM
  600 weight is for Model As. It is too heavy for our V8s


martin.scheffer@gmail.com    -- 09-14-2022 @ 2:44 PM
  Wow, you and Marco have definitely made my day. Thanks so much. Anybody using synthetic? I ran it very successfully in a 39 Desoto for about 6 years. Any brass or copper in the trans or diff? Lucas makes a conditioner which you mix half and half with their gear lube to protect such items.


carcrazy    -- 09-14-2022 @ 5:07 PM
  If you use a synthetic gear oil of a viscosity less than SAE 90 weight, you increase the possibility of having oil leaking from the transmission.


marko39    -- 09-15-2022 @ 6:15 AM
  Yes there is some brass in the trans. Synchronizer and that’s why GL4 is used. Stalube is one brand available.


martin.scheffer@gmail.com    -- 09-17-2022 @ 11:55 AM
  Thanks again for the helpful advise


FordFreak    -- 09-17-2022 @ 12:56 PM
  StaLube GL 4 140 wt. I get mine through NAPPA. - F F

1937 Ford Coupe
1952 Ford F1 Pickup
1965 Falcon Sprint


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