Personally, I don't think there will be a shortage of 4.88 gear sets in the foreseeable future.  Virtually every 2nd Gen Tracker sold is an auto tranny with 4.88 gears.  I really don't know what the exact ratio of autos versus manuals sold was but I would guess it was somewhere in the area of 1 manual tranny truck for every five or even six auto tranny Trackers.  Check out Cars.com and other used vehicle web sources, search "Trackers" and check it for your self. See how infrequently a manual tranny truck is up on the market blocks for sale.  Not sure of the GV ratio or the added variables of R&Ps they came with, but I'll bet the manual tranny to the auto tranny sold is about the same for the GV as well.

I think one of the plusses for the 2nd gen trucks is you can still go to 4.88s or 5.12s (if you had a manual tranny truck with 4.62 gears) to regain your mechanical advantage when running larger tires.  With most of the first Gen trucks you start out with 5.12s because the 1.6 liter engine needed this large mechanical advantage just to turn the tires to start with because they only produced 80-96 HP depending on whether it was an 8 valve or 16 valve engine.  Since Calmini doesn't sell the 5.83 ring and pinions anymore owners are pretty much reduced to finding the truly rare 5.38 and 5.62 gear sets OR going with a Toyota axle conversion which is pricey.  One of the guys on the forum (Skyhiranger... I think) has at least a set of each of these gears for sale and he's asking $500 for a set of the  5.38s and $1000 for a set of the 5.62s.  Actually not bad prices for what the gears can do for your truck... if you have the cash for them.

Course the 2nd gen trucks came with the air actuator in the front diffs which limits their upgrade ability.  You can run taller gears but you have to change the diffs and other front end components to entertain running lockers.  The last 1st Gen Tracker was the 1998 model year.  That makes that Truck 12 years old now and getting older each day.  They will soon disappear from the road and the 2nd gens will start becoming more affordable to buy and upgrade for just trail riding.  Hope the aftermarket companies continue to produce new upgrades for these 2nd gen trucks.  They are the market place future for Suzuki 4X4 SUVs within the next 10 years, I think.