That's what I use. Would be tempted to put synthetic in the tranny. I changed out a couple of my kids cars trannys to synthetic and made quite a difference especially in the winter.
49 must be a manual tranny so straight gear oil should be fine.
When I acquired my low mileage automatic 65 CS I was looking to change out all the fluids. Called one of the major synthetic manufacturers to ask about switching over. He advised that if I was just doing a flush and fill then to avoid the synthetics. Said the old seals etc would probably leak as the synthetic would flow more. Said if I was doing a complete rebuild then synthetic would work just fine.
I'm not a proponent of synthetic oils at all but had heard of the difference in trannys so like I said I tried it in 2 of my kid's cars. Unbelievable difference, especially my youngest had a little Cavalier. Always was sort of a sticky shift and it instantly transformed it to silky smooth. In fact they are still running that little car in between Ottawa and Mount Tremblant every week. I'm hear to learn what the reasons are.
Jerel, I suspect the little Cavalier is a somewhat newer vintage than a 1949, and henceforth ok to run synthetic. For the old school, especially with old seals, synthetic will become a large oil stain on the driveway.
Yeah I understand the obvious with old leaky seals and synthetic will leak out easier than standard oil but with replaced seals I wouldn't see an issue.
That's what I use. Would be tempted to put synthetic in the tranny. I changed out a couple of my kids cars trannys to synthetic and made quite a difference especially in the winter.
Someone who supposedly knows manual transmissions once told me that the syncro assemblies in the old units such as the 60's Muncies don't work well with synthetic. I haven't ever tried it to see if that's true but of course that won't apply to a 49 which I'm sure is not syncronized in any gear.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
I used synthetic in my old plow truck an early 80's 4 speed with bull low. It made it so much easier shifting gears in minus 20- and below temps. The tranny shifted with little effort but with the 80/90 gear oil at the low temps it was a chore to shift until the powertrain really warmed up. I still use gear oil in all the old vehicles as they are not used in cold temps.
I won't be driving it in the winter so not an issue.I will just go with the 90 w gear oil if I can find it,which is becoming an issue.First few auto parts stores looked at me like I was searching for the holy grail,lol
