I do the same swinging spanners on my rangie and I just love the mechanical simplicity! Sounds strange I know but they are fantastically engineered bits of kit.
I like to push mine as far as it will go and despite a front strut letting go and a low pressure fuel pump, its yet to cost me some serious money!
First thing I did when buying was change the TC for a heavy duty one, its my understanding that the excessive wear of the TC clutch (due to the stupid tune RR gave it) sends foreign material thru the system where the valve body is susceptible to the wear, thus causing the low pressure and making the problem even worse.
Not to mention they are bloody unreal on the dirt, go for it! everything is cheap when you can do it yourself

