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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I don't see the designation for 3.55, or 4.10 gears...... Don't know what the code for 3.92's was..... Half ton truck, right? (should put that info in your sig, and profile.)
In the FAQ/DIY section, there is a thread about getting a build sheet for your truck. It will tell you EVERYTHING that was on it from the factory, including gear ratio. There should also be a tag on one of the rear diff cover bolts, that has gear ratio on it. (of course, those are notorious for getting 'lost' when someone changes the fluid.....)