Fairey is the way to go. I just drove 200 miles round trip today with my 109 and it is fantastic. However even without a thermostat in the cooling system the fairey with get the engine to the halfway mark on the temp guage as I am pushing the 109 to about 60 -70 mph with the 2.25 petrol so not too sure about the advantage of the high ratio?? If it's too hot or it was an issue just pull out the thermostat and save $1,800?  I run mine year round with out a thermostat and still have plenty of heat. I'm rambling now.....Fairey overdrive is the ticket. 
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82' series III 109 safari prepared 2.25 pet.WILL NEVER GET RID OF!!!!!!
91'Range Rover classic 3.9L V8!(sold)
98' Land Rover Discovery with a MOD wolf 300 tdi(sold)
97' Defender 90 300 tdi (sold)
99' p38 Range 4.6 autobiography (sold)
2007 Porsche GT3..faster than the 109!
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