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1929 Cadillac Transmission Help

Started by john29cad, August 05, 2023, 05:09:14 PM

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john29cad

August 05, 2023, 05:09:14 PM
Hello,
By mistake I drained the tranny fluid instead of the oil when changing my oil in my '29.  I read the 29 shop manual but couldn't find anything out there about where to add transmission fluid. I'm thinking it's the cap on top accessible from inside the engine compartment.   Could someone please advise?
Thanks,
John

V63

#1
August 05, 2023, 06:17:44 PM
Seems I just checked a 1930 model and it should be on the side of the transmission? Square pipe plug about midway forward right side, it's full at that level.

john29cad

#2
August 05, 2023, 06:55:35 PM
Great. I'll check it out, next time I will not be talking to someone when I'm under there.  It takes 2.5 quarts, is there a preferred oil?

V63

#3
August 05, 2023, 07:20:34 PM
I like to substitute 1 qt LUCAS oil stabilizer (see label for manual transmissions)

Royal purple makes an additive as well.

john29cad

#4
August 06, 2023, 04:05:07 PM
I talked with a couple of '29 Cad owners and they recommended 85W140 gear oil, which you can get a NAPA.
Thanks,
John
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