Hello,
You've got the forward/back operation bit correct.
1) There is a Nuetral position, but there's no 'notch' for it- you just have to leave the lever somewhere between the two gears. It's not designed in, but it does exist, if that makes sense.
2) The main gearbox works as normal regardless of whether the overdrive is engaged or not- so you have in effect 16 forward gears and 4 reverse- BUT- to save over-stressing the O/D, only use it in High 3rd or 4th.
3) The O/D is either ENGAGED or DISENGAGED, there's no clever work needed.
So, in an ideal situation, you'd have this:
i) O/D Disengaged, pull away in 1st, change to 2nd, change to 3rd (as usual).
ii) Depress clutch, push O/D lever forward to engage, release clutch, accelerate
iii) Depress clutch, pull O/D lever back to disengage. Engage 4th. Accelerate
iv) Depress clutch, push O/D lever forward to engage, release clutch, settle into the 'cruise'.
Of course, you don't have to to use the O/D in 3rd as well as 4th- that's just an example of how it works. Most people just use it in 4th once they've wound up to their cruising speed to reduce noise / fuel consumption.
I hope this helped (if it made sense at all),
Jack
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