Remove the battery (see Removal the battery).
Remove the starter (see Removal the starter).
Drain the oil from the gearbox (see Gearbox oil change).
Remove the front wheel drives (see Removal the front wheel drives).
Disconnect the wiring harness from the reverse light switch (see Removal the reverse light switch).
Before unscrewing the bolts securing the gearbox housing to the cylinder block, mark their position.
This will make subsequent installation of the gearbox easier, since the lengths of the bolts and the hexagons of their heads are different.
Using a 19 mm socket head, unscrew the bolt securing the gearbox housing to the engine cylinder block, located under the coolant pump inlet pipe (for clarity, the cooling system hose has been removed).
Using a 19 mm socket head, unscrew bolt 1 and nut 2 of bolt 3 securing the clutch release slave cylinder bracket, holding bolt 3 with a wrench of the same size.
We remove the working cylinder rod from the hole in the clutch release shaft lever…
…and, without disconnecting the hydraulic drive, we move the bracket with the cylinder away from the gearbox.
In order not to disturb the adjustment of the gearbox control drive, we mark the axial and angular position of the gearshift mechanism tip relative to the control rod with paint.
Loosen the nut of the control rod terminal connection bolt with the tip (see Adjusting the gearbox control drive).
We remove the tip from the rod hole.
Using pliers, squeeze the clamp securing the wiring harness to the gearbox bracket and move the wiring harness away from the bracket.
Using a 10 mm socket head, unscrew the bolt securing the ground wire tip.
Disconnect the engine management system wiring harness from the vehicle speed sensor (see Removal the vehicle speed sensor).
Using a 19 mm socket head, unscrew the bolt securing the bracket and gearbox housing to the engine cylinder block and remove the bracket with the bolt.
We remove the heater radiator outlet hose from the gearbox holder.
Using a 19 mm socket head, unscrew the two front crankcase mounting bolts.
Using a 14 mm socket head, unscrew the two front bolts and the lower bolt securing the gearbox housing to the engine sump.
Using a 14 mm socket head, unscrew the bolt securing the gearbox housing to the engine sump and using a 19 mm wrench, unscrew the bolt securing the housing to the cylinder block.
We install an adjustable stop under the engine sump, placing a wooden spacer and a stop under the gearbox housing.
Using a 17 mm wrench, unscrew the nut of the bolt securing the gearbox bracket to the rear support of the power unit, holding the bolt with a 14 mm wrench.
We take out the bolt.
Using a 14 mm socket head, unscrew the two bolts securing the left support of the power unit to the side member.
We lower the gearbox using an adjustable stop.
We move the gearbox away from the engine and remove it together with the left support.
We install the gearbox in the reverse order.
Before installation, apply a thin layer of SHRUS-4 grease to the splined portion of the primary shaft.
After installing the gearbox, fill it with oil.
If necessary, adjust the gear shift drive (see Adjusting the gearbox control drive).
When removing or installing the gearbox, do not rest the input shaft of the gearbox on the petals of the pressure spring of the clutch housing, so as not to damage them.
[Information taken from the official website: ChevyMan.ru]