Noise in final drives-750J LGP Deere

I've almost always been around cat dozers but recently bought a Deere 750J lgp. I've put around 300 hrs on it. Machine has almost 5000 total hrs. Like the dozer other than a "whining" noise towards the final drives ecspiecally when in a higher gear. Checked all fluids and there fine. Didn't know if it was a Deere thing or what.

Noise in final drives-750J LGP Deere