hi all i am new to this site, i have a manual 91 nh pajero intercooled turbo diesel the car has done about 40-50k since engine build which was done way before i got it, when i brought the car about 8 months ago i took it to the local mitsubishi dealer for a service and a check over 1 problem they said that they found was that the rear diff would not lock in ( so both wheels would drive) apparently because my pajero was a fully imported unit from japan? they had no information on the extra bit's n pieces, he explained that when the switch on the dash is hit it runs a small compressor (under the back seat) that pumps air intodif to lock it into dual drive (which does not effect the front diff) he said that everything is working as should except for inside the diff, has any one cone across this problem before, what are my options
also while i have your educated attention i am currently running 31x10.5 15 tyres i think that it rev's to high @ 100km it rev's @3100rpm i tried running 265 70 16 tyre & rim's and found that it didnt make that much difference to the rev's at 100 not sure what the gear ratio's are on the diff's , what are my options
![Dunno[1]](https://www.pajeroforum.com.au/core/smilies/0/0/5/4/3/6/images/smilies/dunno[1].gif)
![Dunno[1]](https://www.pajeroforum.com.au/core/smilies/0/0/5/4/3/6/images/smilies/dunno[1].gif)
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