That must scoot! 3.46 is what the same drive train gets in a 107.
Www.Automobile-catalog.com is a pretty reliable source for differential ratios IMO.
I am pretty confident that the rear end that came out of the 1969 280s I parted was a 4.08, not a 3.92 like automobile-catalog says. I continued checking that site from 1970 back to 1967 for 280 w108, and the results I got going back were all 3.92 (despite being confident I pulled a 4.08 out of one).
Then I checked a 1972 280se and low and behold, automobile-catalog.com does say a 72 280se should have a 3.69.
But I think the only way to really figure out what any car actually has is to take a good look at the diff itself. I’ve had many scenarios where the ratio is not at all what’s expected and a couple of cars that were NOT purchased with the expectation of a desirable Diff ended up being a LSD with a great ratio. I’ve even purchased v8 cars that ended up having a 6 cylinder diff.
We are talking about 50 years of history here. Anything could have happened.
So just bring a jack, stands of some sort (JY wheels?), tarp, gloves, safety glasses, and a few wire brushes, some cleaning spray, and rags. Be prepared to get those gloves dirty scraping off thick greasy crud.
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