gearbox and diff oil

[TVRmikey]

hi all. sorry im sure this is been asked before but I have the oil recommended by my local factor and wondered if anyones used them. the oils are-

gearbox)comma dextron 2 AQM
diff) SAE90 GL5 EP80 (I think)

thanks

[Richard 858]

Which diff & gearbox do you have ?

[TVRmikey]

sorry yes I have the T5 gearbox and I believe a GKN rear diff. sorry I should also add my cars a 1996 400. my bad. cheers

[N7GTX]

The fluids are near the bottom of this link:

http://www.parkersteve.dsl.pipex.com/chimaeraparts...

[fatboychim]

Ive always used this in my GKN

http://www.opieoils.co.uk/p-68901-fuchs-titan-race...

Mine has been fine for years with plenty of abuse, although it's starting to grumble a bit these days.
Whatever you do use check it is suitable for LSD's.

I also used a synthetic ATF for the T5 but that's probably a bit unnecessary.

[Richard 858]

Can't comment on the diff I'm afraid as I have a BTR but I believe the T5 is happy with any decent ATF. I use royal purple fully synthetic in my T5 but, as Andy (fatboychim) has already said, that may be unneccesary.

[TVRmikey]

Thanks all

[NZ fan]

Not sure if all the GKN diffs are the same but mine is a " helical torque biasing " type so no plates as such. After a year or so of ownership I changed the diff oil to a Fuchs LSD type oil and not long after my side seals started leaking. When I removed them I found they had a metal outer with a bonded rubber lip and the rubber lip had just let go of the steel on both seals?
I contacted GKN and they had this to say... ( I didn't mention the seal failure I just asked why HD90 a non LSD oil was recommended)
I now just run a standard non LSD oil as recommended on the lube plate and it's been fine.
Obviously some are having no issues with LSD oils and my seal failure may have just been a coincidence they were 20 years old after all and I have since had to do the pinion seal which didn't fail in the same way, it just leaked at the lip like they usually do. Don't mean to ad confusion just passing on my experiences. Food for thought and all that

[TVRmikey]

Thanks nz very useful info.

[ch427]

i went for this recently, was recommended on a thred here somewhere.
http://www.classic-oils.net/Morris-XFS-80W140-Synt...

[ChimpOnGas]

Here's what I use...

Diff (It really doesn't matter if the diff is GKN or BTR):

http://www.classic-oils.net/CRX-75w140-NT


T5 Gearbox (This is a subject of much debate, but you certainly can't wrong with good old ATF)

http://www.classic-oils.net/Morris-Super-ATF

Don't use a fully synthetic ATF though, it's too slippery for the sychros to bite on fast shifts.


Saying that controversially I've been running Penrite SIN manual transmission fluid in my T5 which has worked out really well, being a little more viscous than ATF it solved the problem of being able beat the synchro on 5th when changing quickly to that gear and overall the shift quality was improved (hot & cold).

http://www.classic-oils.net/Penrite-SIN-Manual-Tra...

This oil contains no sulfur so is completely safe where brass is present, it also seems to be compatible with paper lined syncho rings as used in the World Class T5. Finally (but importantly in this case) it's also light enough to effectively lubricate the needle roller bearings in the WC.

Some more from me about this oil here:

http://www.pistonheads.com/gassing/topic.asp?t=147...

[Lolo256]

NZ fan said:

Not sure if all the GKN diffs are the same but mine is a " helical torque biasing " type so no plates as such. After a year or so of ownership I changed the diff oil to a Fuchs LSD type oil and not long after my side seals started leaking. When I removed them I found they had a metal outer with a bonded rubber lip and the rubber lip had just let go of the steel on both seals?
I contacted GKN and they had this to say... ( I didn't mention the seal failure I just asked why HD90 a non LSD oil was recommended)
I now just run a standard non LSD oil as recommended on the lube plate and it's been fine.
Obviously some are having no issues with LSD oils and my seal failure may have just been a coincidence they were 20 years old after all and I have since had to do the pinion seal which didn't fail in the same way, it just leaked at the lip like they usually do. Don't mean to ad confusion just passing on my experiences. Food for thought and all that

Hi,
What did you fellons think about it? It seems that very few of you have tested some regular 75w90 manual transmission on their diff??i have 3liter of manual transmission left from anther car...should i fill it in the diff??

Just bought the car and did the necessary improvment and the full service... i m saldly need to minimise my expense but i ll not destroy a diff to save 20£!

[Belle427]

Don’t mess around testing oils in it, just stick with the recommended lubricants.
I’m not sure what intervals the changes should be but I’m guessing one every few years is beneficial for what it costs.

[NZ fan]

still running the standard non LSD hypoid diff oil with no problems. i have consistanly done around 12000.km's per year for the last 5 years [car ex japan so speedo in km's] off up to the north of NZ next week for another 2000.km's of touring love it!

[Lolo256]

NZ fan]still running the standard non LSD hypoid diff oil with no problems. i have consistanly done around 12000.km's per year for the last 5 years [car ex japan so speedo in km's said:

off up to the north of NZ next week for another 2000.km's of touring love it!

So you mean 75w90 type of oil am i right?

[NZ fan]

sounds fine to me. as the guy from GKN states HD 85/90 is a good substitute.

Edited by NZ fan on Monday 9th July 08:57