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Mike c

Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 941

Transfer box oil change?

Hi, service time coming up soon, I currently run castrol syntrans 75w-90 in the transfer box, but it's quite whiney between 50/60mph, would changing to a different oil grade help reduce the noise a bit? Researching I have found that ep 80w90w as per diff oils can be used even though the book states 75w-90 for transfer box

Just wondering if anybody on here as any experience with swapping oil types for the transfer and if they could offer any advice?

Thanks

Mike

11th Oct 2020 3:58pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8326

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Hi Mike, if its noisy something is not happy. Changing oil viscosity may mask it but it won't fix it.

Are you sure its the t box making the noise? Is it noisy under power, ciadting or on over run? Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

11th Oct 2020 5:53pm

Mike c

Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 941

Its noisy under power, if you back off it stops, it's only got about 96000 on the clock otherwise great, the gearbox itself runs and changes lovely hence suspecting the transfer box as the noise generator. I have read a whiney transfer box is common though? I just wondered if the oil would make any difference.

Thanks

Mike

11th Oct 2020 6:01pm

PCM

Member Since: 25 Jan 2019
Location: North East
Posts: 895

After many forum posts I went with Motul gear 300 in transfer gear and diffs.
Drives like a new motor.

11th Oct 2020 6:26pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8326

have you tried removing props one at a time to check its not diffs. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

12th Oct 2020 10:56am

Mike c

Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 941

No I haven't tried this, obviously its something that will need further investigation. If it was the diffs though, wouldn't it do it all the time, so not just under load? I have depressed the clutch at that noisy speed briefly and the whine stops instantly

12th Oct 2020 12:27pm

Mike c

Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 941

Hi, replying to my own post here, but what transfer box oil do you use, 75w 90w as per book or ep 80w 90w?

Thanks

Mike

13th Oct 2020 6:49pm

miker

Member Since: 13 Sep 2015
Location: Surrey
Posts: 1784

Personally I have a drum of cheap ep 80 90.

Seems to do the trick, Box whines, but it's done 230k and has run dry at least once in it's lifetime.

13th Oct 2020 9:53pm

ALIMIF

Member Since: 02 Nov 2020
Location: YORKSHIRE
Posts: 2

PCM wrote:
After many forum posts I went with Motul gear 300 in transfer gear and diffs.
Drives like a new motor.

Have you had any problem since putting the Motul oil in, did it stop the whining

2nd Nov 2020 5:45pm

Mike c

Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 941

Its weird, I went with the book 75w-90 for my 2004, yet my land rover indy who really knows his stuff and has been in the business for many years told me it's the wrong oil for the transfer box?

I pointed out that I ordered the oil as per book, but he said it will make it noisy, I think he has always stuck with the ep 80w90w for years for diffs and transfer box. There seems to be a mix of views on here.

2nd Nov 2020 6:35pm

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