Gu patrol 4th an 5th Gear Whinning noise

[TejayTahii]

Hey everyone Just 2anting to no if anyone has experienced 4th an 5th gear whinning noise under acceleration Goes away as soon as foots Off the pedal

[mudnut]

If it was a gear cluster bearing, it would whine in 1st, 2nd, 3rd and fifth, but not fourth. What model, what year,what engine?

A lot of Patrol gearboxes require a GL4 oil instead of a GL5.

[TejayTahii]

04 gu patrol zd30

[Hodge]

Some early GU's are renowned for a weak 5th gear. I don't know what year range this belongs to. I think there was a upgrade released.
Just search for GU 5th gear on this forum. Or google it.
http://lmgtfy.com/?q=GU+5th+gear

[drgtr]

Those manual gearboxes are strong as Even the pre 2002 with shorter splines for 5th.

Check elsewhere. Personally i dont think its the box. Check diff fluids and transfer case too