Diff oil amounts

Quick hijack but on subject as I commented in the sticky but not sure if they get read.

For gearbox flush I was told today I should do single drain and fill only and save the money vs dual flush for little extra gain. It's like $1000 vs $650 based on the steel pan. Thoughts?

The gearbox holds 9.5 litres - a basic drain and refill is 3.5 to 4 litres so with a basic change about 60% of the dirty, cruddy old oil stays in the gearbox/TC unit. A mega flush removes much of this old stuff so when completed it leaves the oil pretty well refreshed.

Garry

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Originally Posted by garrycol

The gearbox holds 9.5 litres - a basic drain and refill is 3.5 to 4 litres so with a basic change about 60% of the dirty, cruddy old oil stays in the gearbox/TC unit. A mega flush removes much of this old stuff so when completed it leaves the oil pretty well refreshed.

Garry

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Agree. I got over 5L out with the pan drop but around 4L with a subsequent drop.

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Originally Posted by justinc

Martin i would certainly check your front differential for condensation if your vehicle is prior to 09. The breathers were redesigned due to problems with condensation and rust forming inside the housing

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Thanks Justin.

Mine was bought new in November 2013.

Martin

I get 6 to 6.5 litres back in. And double change not flush, on really bad examples.

If it's warm might it flush better? Just don't burn your hands.

To ensure the correct level the transmission needs to be between 30 and 50 degrees C.

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Originally Posted by justinc

I get 6 to 6.5 litres back in. And double change not flush, on really bad examples.

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So to summarise (rule of thumb) once is enough if the oil is clean but do twice if discoloured?

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Originally Posted by PerthDisco

So to summarise (rule of thumb) once is enough if the oil is clean but do twice if discoloured?

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Yes if you are doing it by dropping the oil from the sump only then if that oil is clean then the remaining oil in the system would/should be clean.

Cheers Ean

Well, after reading this thread and knowing the car has done 85Mm 60% of it with the van in tow I ended up getting Royal Purple 75W90 for the front diff, RP Syncromax for the transfer and genuine LR019727 (in a Castrol container labeled BOT 720) for the E-Diff. What I was really happy about is that all of the oils looked clean when I dropped them, there was no abnormal smell, discolouration or large particle contaminates on the magnets. Happy days! The cost of the oil from LR is still a bite rude but as others have commented worthwhile preventative maintenance.

Peter