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Post Info TOPIC: rear diff and manual trans oil


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rear diff and manual trans oil


What is everybody using for oil in the rear diff and manual transmissions.Got to fill up both on my 49.Manual says 90 w?is that correct?



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Canadian Poncho Superstar!

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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.

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Jerel


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DO NOT USE SYNTHETIC in 1949 trans just use 90 gear oil

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694279 wrote:

DO NOT USE SYNTHETIC in 1949 trans just use 90 gear oil


         Amen . 



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Canadian Poncho Superstar!

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427carl wrote:
694279 wrote:

DO NOT USE SYNTHETIC in 1949 trans just use 90 gear oil


         Amen . 


 Must be an obvious reason, fill me in.



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Jerel


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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.

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Canadian Poncho Superstar!

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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.

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Jerel


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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.

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Canadian Poncho Superstar!

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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.

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Jerel


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jmont64 wrote:

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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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.

Al

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