Put the output shaft with the 2nd gear gear on the press and press the speedometer drive gear, thrust washer, reverse gear, spacer, needle bearing, 1st gear, 1st gear synchronizer ring, 1st and 2nd gear synchronizer sliding sleeve with hub and 2nd gear synchronizer blocking ring, needle bearing and 2nd gear gear.
Clean parts and check their condition, replace defective or badly worn parts.
Note. The countershaft rear bearing can only be removed after the rear cover of the gearbox housing has been heated.