Hi guys
Going to change my diff and
Trans box fluid soon as possible! On my 2006 hse sport. What is
The fluid I need to get I think is 75/90 ?
Any particular make and can i use same fluid for diff and transfer box also ??
And how much goes in each has I know they have specific amounts in them

Cheers guys

Front diff is 0.6l, rear (non-locking) is 1.1l. (The rear locker takes a different oil - IIRC, 1.5l - but it's very unlikely that you have this.)

Transfer box is about 1.5l, and is fill to spill.

Castrol Syntrax is recommended for the standard diffs, and I (and several others) have used it in my transfer box too and not observed any issues (but by the book, LR's own "secial transfer box oil" should be used).  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

Cheers for that ! How do I tell if I have a electronic rear diff ?

It's very rare for a RRS to have it (other than HST and G4 models), but there'll be some elctrical gubbins and a motor on top of the diff if it's the E-diff.  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver