Manual trans.
API GL-4 SAE75W90W or 80W90W gear oil
Differential
API GL-5 SAE 80W90W hypoid gear oil
Transfer case
API GL-4 or GL-5 SAE80W or 90W gear oil
yes
6x5.5 for a b2600 4x4
I found a listing for a 1988 Mazda B2600 ( 2.6 L 4 cylinder engine / 3 speed automatic transmission / 4X4 ) and listings for 1990 through 1993 Mazda B2600I ( 2.6 L 4 cylinder engine / 4 speed automatic transmission / 4X4 )
The relay is next to the battery. The coil and power module are on the front driver wheelwell.
4x4 = 4.3
I wonder what the real problem is. There are 2 B2600 models, one is B2600 and the other one is B2600i, one its a Mitsubishi engine the other is a Mazda, if you just want to turn engine ON just jump a wire from + of Bat to + of ignition coil, then jump the starter until engine is ON. The tittle of the question shows a little of ilegal action, this instructions will help if only the engine needs to be ON, but steering wheel will be lock all the time.
The shift gate or the synchronizers can be worn. Also the clutch can need adjustment if possible.
horn circuit mazda bt 50
121 hp
its junk
the gear would be 3.55
90 weight gear oil.