I don't know about Jericos, are they modeled off of the toploader? They look very similar.
The very first Jericos look like the first one in the pictures.
It is more of a box type and has some features of the Top loader.
The later versions look a lot like Top Loaders on steroids.
The DR4 R4 has wider gears about 1/8" wider.
Then you can get into ultra super duty with mid plate.
Then you can do a Gear Venders.
Then you can get into full custom 5 speeds and then I start thinking I'll...
How much ya wana spend...