To be honest, me being an ignorant auto enthusiast thought at first that this can't be right because most cars with manual transmissions have higher top speeds and lower top gear ratios. It appears that this is not the case with Pajeros despite the fact that the manual is 5 forward and Auto is 4 forward.
It would have been much easier if anyone had posted the gear ratios (which I will now). The 1 flaw in above information I spotted was the auto transmission code. I believe it is AW03 (1st gen auto) instead of 4AW2 (2nd gen gearbox).
I am also surprised as to why the experts haven't suggested the simplest solution of putting on larger diameter tires.
Another solution would be to change the manual with a V6 auto. I think it fits but acceleration at low speeds will suffer.
My 2 cents.