Sorry I have no experience of your car, GoMoG.com is a fantastic resource, other than that generally gearbox and axle fill point also acts as the level..?
There is a Morgan Four owners 1936-1981 workshop Manual from Brooklands Books OWM 796, which might be handy to have, though no mention of gearbox oil level that I can see.
As for the correct grade of oil... A bit of research required though there are specialist oil suppliers for classic vehicles that might be worth a try..?
Good advice! I thought I'd use the opportunity Luddite affords to give some general information about gomog.
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Gomog does not publicly cover 4/4 Series I. I took everything specific to it down many years ago..
as I did with Aeros and post 2004 cars (saving Roadsters which
I host [i]but do not contribute to for the Roadster forum. In the case of first 4/4s, I was told that some of the information was inaccurate without help on how or why. I am
uncomfortable publicly posting information that I cannot verify or there I am told there are doubts about, so I removed everything I had on it. With the Aeros and post 2004s, the
models began changing constantly, even weekly, without MMC notes and I could no longer track each with confidence. I believed, at the time, that forums would be best to handle
these models. Of course, many of the 4000+ gomog pages can assist for components that didn't change. Gomog also covers engines and transmissions which MMC and does
not.. It all stops at the last LR/Rover Plus 8 in mid 2004. I archive other information, I merely do not post it. The gomog archives are many multiples the size of gomog.
Morgan stuff is my way of doodling. However, the Series I is the only trad that the MSCC covers and holds spares for.
https://www.morgansportscarclub.com/spares The two sources for information for the model
were (are?) George Proudfoot (UK) and John Merton (Australia) MTWC is quite amazing in this regard.
The archives indicate the Series 1 used a Meadows 4 speed gear box until the Spring of 1938 when HFS switched to a Moss box. There might be some early Handbooks that can
assist.
https://www.gomog.com/allmorgan/Hints&HandbooksIndex.htmlThe image below is courtesy of a gift from the late Ken Hill. Even Ken shows nothing after until 1949. Good luck.
gmg
You should have one of two engines. But I believe you have mossbox. If so, I have seen contentment with GL4 fluid. The dip stick hole is the filler hold I believe
![[Linked Image]](http://www.gomog.com/TEMP/44specs1938~39.jpg)