There are no hills in that area that should worry your Cruiser. There are some that will give it a bit of a workout but you should not worry about that.

Your route is very confusing particularly when you mention Mungalli and the nonexistent East Palmerston (Google Maps does not recognise it.) What is your actual route (include the start and finish points.) If you stick to the roads in yellow on Google Maps you should not experience any difficulties. (However, you should slow down and use your gear selector to select low gears so you don't have to use your brakes too much on steep descents.)

Keith, I think you are going to have to learn to cope with mountainous roads if you are going up there. You have a Landcruiser so what is your problem? (Is it a Series 60?) I have details of the gradients on three of the four roads up to the tablelands. All the roads are a full two lanes wide and are of similar gradients. The roads are Palmerston Highway, Gordonvale - Atherton (Gillies) Road,  and Mossman Mount Molloy Road. I have no similar information on the Kennedy Highway but it is similar to the other three.

skinsy11 wrote:

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I think it should cope with about a 10% incline with a low gear selected. What are the gradients on each of the roads: (1) Mossman to Mt Malloy (2) Macalister Range to Kuranda and (3) Palmerston Highway A25 Innisfail to Millaa Millaa. Those gradients will be appreciated, by me and no doubt others.

We have done the Gibralter Range from Grafton NSW to Glen Innes NSW and the cruiser did that okay and did not 'break out is a sweat'. (I am talking about the Mrs, not the Landcruiser which handled it admirably!)

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Keith, what is wrong with your cruiser? Cruisers should eat the Clyde Mountain. I suggest you get your tug seen to before you go anywhere. When I was with the Canberra Caravan Club that route was just a commute route to our members.  If you think the catch-can fixed your power problems you should be OK on any hill on the Oz highway network.

Did you not open my links? There are tables there that show the total length of the road over 5, 10 and 15% gradient. You will find the same sort of table on the road you are familiar with - Map of Kings Highway. You will be able to compare the Clyde with the three I linked to for you. Granted, you will be down in your lower gears on the steeper bits but none of us seasoned drivers worry about that. If you can't cope with any of the steep pinches you can always use low range, your transmission should cope with a few kilometres of that. Bonzle did not include the gradients on their map of the Gwydir Hwy so I have not included it.