3.73 R&P are OK for stock tires. You likely have much larger tires, given your lift. Stock tires are 205/70R15 at ~26.3" diameter. Assuming that Suzuki engineers got the gearing about right, you might want to increase your high-range reduction by about the same percentage that your tire diameter is larger than stock. You can add additional reduction in the transfer case or in the front & rear differentials, or both
As an example, my tires are true 29's, about 10% over stock. I chose the 4.16:1 T-case gearset with 12% additional high-range reduction and kept the R&P unchanged. There are only a few R&P ratios available to choose from. 4.30's are somewhat rare, and you'll need two sets. Installation can be tricky if you don't know how to do it (and I don't). Up to about 31's, most guys manage with T-case gearing. Above that, adding additional R&P reduction seems to be increasingly desirable, distributing the stresses to reduce parts breakage. Tire size is the biggest factor in choosing the correct gearing, especially for a daily driver. Gearing is arguably the MOST popular discussion subject. There are years of discussion and debate to assist you, just by searching. There's a good T-case gearing chart at lowrangeoffroad.com.
Edit: The biggest advantage of T-case gearing is that you get a much lower low range than OEM (2.26:1) -- 4, 5, or 6:1. Every gearset has its own high-range reduction as well, varying according to gearset and supplier. If you get your high-range gearing about right, your low range gearing seems to work out as well. Also, the early Sami's had a ~8% higher (lower numerically) 5th OD gear. Later Zuks had the 5th ratio lowered (higher numerically) for better pulling power on the highway, at the expense of a few hundred highway RPM. With your early 5th gear, you could consider greater gear reduction than would work for my later ('93) model on the highway.
