Range Rover gearing problem.

Ok i bought this a week or two ago and im trying to get it sorted for off roading and to use for work. Its an 89 RRC with a 200Tdi engine and box fitted and running on 265/75R16 Insa Turbo tyres. The problem is 1st gear is too high and if i stop on a hill its a case of slipping the clutch big time to get it moving. Im thinking this is down to the tyres. It has a 1.222 transfer and I think I need a 1.410 transfer to sort this out, but on reading quite a few threads on ratios i here people saying their 200tdi pulls good with 1.222 and tyres my size.The trouble is if i put a trailer on there is no way i could set off on a decent hill without going into low. Any advice would be great, or if im right about the 1.410 trans and you have/know of one for sale that would be great as well. Thanks

If yer finding you haven't got enough grunt low down, you can try adjusting the fuelling on your Tdi to give it a bit more shove...

http://www.stonefisk.com/doc-arc/def_man/ThermoGuard_Tdi_Tuning_Rev.2.pdf