Yes, this is normal. The big wheel you are seeing is called the flywheel. The teeth that you can see are what the starter motor engage to turn the motor over. The hole is simply an inspection hole. From the factory there would have been a rubber plug in the hole, but if it has gone missing it is no worry.
SOURCE: how do i replace the gearbox of a holden VR?
Taking out the tail shaft from the rear diff but before pulling out of the gearbox Drain the oil from the box,take out the shaft,Take off the battery earth lead,and now the starter motor.and the bottom metal plate at the bottom of the bellhousing (should be 4 small screws. and undo the 4 bolts on the flywheel metal plate which hold the torque converter on to engine. undo the bellhousing bolts and the top hose on the radiator ,and the gearbox X member and let down g/box slowley and slide it off WITH converter on the box ,
When refitting the other box its all in the reverse of removal (ALL OF IT) as well as the converter on the gearbox before it goes in as it fits on the shaft and turn it around and keep going untill it slips into the 2nd lot of splines and in line with the bell housing face.(Do not damage the g/box seal).
Let me know how you get on , Aussie Ron
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