colin replied:

you wont get rid of the vibration as its a trait of 4.2 diesal GQ, the motor is being laboured which causes the vibration just give it a touch more throttle and it goes, all 4.2 do it, i solved 95% of the problem by fitting a super charger which gives more low down torgue but this is an exspensive way to solve a problem which will do no harm to youyr vehicle, mine has done 260,000ks and had no drive line problems. Try taking a similar vehicle from a car yard for a test drive and compare. Col

Mick replied:

I sold my shortie at 500k, i bought it at 350k the noise was there when i bought it, and the noise was there when i sold it! And i treated it like hell in all the 4x4 competitions in sydney!

nissan replied:

HI,
LIVING IN OUTBACK QLD I'VE HAD 3 4.2D GQ'S AND 1 GU 4.2D AND ALL OF THEM HAD THE VIBRATION AFTER ABOUT 80000 KM. THE PRESSURE PLATE ON THE FLYWHEEL WAS UNBALANCED FROM A MIXTURE OF BULLDUST, CLUTCH DUST AND WATER BUILDING UP IN BETWEEN THE COVER AND THE DIAPHRAGM SPRING. THIS EVEN CREATED A NO DRIVE SITUATION ON ONE GQ CUTTING ACROSS FROM BEDOURIE THROUGH THE DIMANTINA LAKES NP AFTER 11 INCHES OF RAIN. THE DIAPHRAGM SPRING COULD NOT RETURN PROPERLY TO APPLY ADEQUATE PRESSURE TO THE CLUTCH PLATE. ALL I DO NOW WHEN I GET THE VIBRATION IS REMOVE THE BOOT WHERE THE CLUTCH RELEASE ARM GOES THROUGH THE BELLHOUSING AND UP IT WITH THE HOSE WHILST SOMEBODY CYCLES THE CLUTCH.