cadillac --
I found one 3.90 in florida, dont remember where. There was a medium duty truck called a terrastar, only made for about five or six years. That is were I found my 3.73. The picture showed a speed sensor in the housing, I read that you could not get a speed sensor below a 4.10 I do not believe that now. However! I also have not uncrated the differential yet either. I would tell you to spend some time - couple of hours. looking at florida truck salvage yards. If I found it, you could too. I do not know what the 3.90 came out of. Most s110 axles are out of ford f450 and f550 trucks and ford rv chassis. fords usually have 4,88 some with 4,30 rv 5,13 and 5,38
Spicer rates the s110 for 14,000 ( i think) and ford de rates it for the trucks.
hope this helps
william
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