The two letters are what model you have. There were 4 models, the Van, Tin-Top, Soft Top with half-doors and Soft Top with full doors.
Ok, so it's an SJ-410. On the plus side, you have a much more unique little ride. On the down side it's what came out before the Samurai and parts are harder to find.
Smaller Motor - 970cc 4cyl. 45hp, 49lb's torque stock.
Smaller Transmission - 4 speed vs 5 speed.
Smaller Axles - 3" less width.
Smaller 3rd Member - Cannot use standard Sammy lockers. But you can find them on E-Bay.
Inboard Springs - 1.5" further inboard on each side.
Different T-Case - 84 and earlier can't use Sammy T-case gears. But you can swap in a Samurai T-case.
Plus side:
Sidedraft carb - Doesn't stall on hills like a standard carb.
T-Case Gears - 10% lower in high and low range then a Samurai.
Diff Gears - 4.10 stock in stead of the 3.89
Drive-Line E-brake - Makes swapping to disk brakes in the rear easier. This can swap onto a Samurai T-case.
That is the basics. If it's old enough you also get a metal dash which is pretty cool looking. If you need any parts for it do yourself a favor and give Hawk Suzuki a call. They can get you the right part the first time.
My SJ-410 might be modified a bit. Still has the stock motor and transmission though.
http://www.crawlersnorthwest.com/profile/kandersonspecs2.html
