Outer Limits 4x4 Board

i got an MQ sd33t with a 5 speed gearbox, and i have noticed a whining noise when 4th and 5th gear are selected, it actualy increases with the speed,.
And when i get to about 90+ kph i also get a noise coming up the gearstick (ratling type of noise)
does anyone know the power flow for this gearbox?????????
Thanks

4th direct, 5th offset at rear.
Bush under gear stick can wear for rattle.

Input bearing may whine, rear diff can whine at 80plus kph.
Just get used to the noise level . If it doesnt change over time keep fingers crossed. If it gets louder......

Bazzle