Pre 11/84 1l is pretty much is own unique thing, has different interior, a few body differences, completely different mechanicals ect. 11/84 onwards is basically an SJ50 with 1l mechanicals.
If it's factory disc brake then it's got the light switch transfer which takes aftermarket gears.
Coz the standard transfer is pretty low geared (1.58) the aftermarket gears don't lower your high range that much. You have the option of LJ80 diff gears (4.556) or LJ50 (4.88) which are pretty much worthless but could be a bit difficult to find. There's also 5.12 gears from a Super Carry and 5.38s from JA71 rear if you really like searching for rocking horse poop.
The diffs are pretty strong, Steve ran 34s and didn't kill the gears, Highway/tanshi/wayne ran them for ages too. There's few off the shelf locker bits for them. Lockrite used to (might still?) sell lockrights, APIO sell spools, amusingly Suzuki still sell the important bits for the factory lockers and there's a few German mobs that sell upgraded factory locker bits too. The front CVs are Jimny size but 1.3l NT CVs/axles drop right in. Alternatively, 1.3l diffs are easy to fit but the diff ratios are a bit shit.
Suspension, steering, fuel tank ect is all the same as 1.3s.
You can build a 5 speed out of the later model 4 speed 'boxes. My 1l performed really well, stock it'd do 110 up any hill but it was revving to almost 6000rpm. Bloody loud. The 11/84 onwards models actually have 1.3l engine mounts and the "big case" gearbox so a G series motor is a bolt in conversion. Earlier ones need engine and gearbox mounts moved.
Type 1 is the earliest model. Steel dash, it had drums all round and the non-switch transfer. Amusingly these are around 90kgs lighter than an SJ70.
Type 2 came out 9/83 and brought discs and the switched transfer but otherwise was pretty much the same vehicle.
Type 3 came out in 11/84 with the 1.3l NT. Basically all of these are 1987 model, Suzuki must have brought a shitload of them in then. These shared the body with a 1.3l NT (so plastic dash) aside from having no brake booster, but unlike the earlier models you can quite easily retrofit one.
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