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GT6 Diff oil


Alex Lowe
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Back in the day Triumph could happily sell you a new diff!

And these days we put more power through 50 year old diffs than they were designed for.

But saying all that preventative maintenance is way better than replacing or rebuilding

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I change the gearbox and diff oil every couple of years, using Millers EP80W90 GL4.

Using EP140 in the diff sounds interesting. But I would expect the higher viscosity would be a problem in overdrive gearboxes and could make the overdrive slower/reluctant to engage.

Nigel

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12 minutes ago, daverclasper said:

Is that in the gearbox as well Tony?.

Dave

No Dave, just the diff's. I think it would be a bit heavy for the gearbox? I can't even try it as all my cars are automatic. I have heard mentioned somewhere that 20/50 can be used in the gearbox?? Please don't try it without confirmation, but i can recommend the 140in the diff's.

Tony. 

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17 minutes ago, johny said:

Triumph obviously weren't too worried though and I don't think back in the day diffs failing was an issue...

But remeber that most Triumphs never made their 10th birthday. So yes, new ones available, and plenty in every scrapyard. Today a properly rebuilt diff is £800?? CWP sets are usually too worn to be much good and some parts are unobtanium (but the rebuilders must have a stash, but shims seem impossible find)

Now Marcus has reappeared, I think it was he who suggested a magnetic plug in the filler collected a lot of swarf? 

I also remember, though possibly my imagination, that somebody had fitted a drain plug in situ. Drilled the diff, tapped and flushed the diff then fitted a setscrew/washer. 

As for 140 oil, Moss sell a 85 140 oil, GL5 rated BUT is compatible with yellow metals so safe to use in a diff. I have a bottle for my mk3 spit, with a very slightly noisy diff.

https://www.moss-europe.co.uk/dynolite-no-noise-ep-85w-140-1-litre-ggl823310.html

Nigel, I too use millers 80-90 GL4 for most stuff. Type 9 box uses Comma sx75-90 GL4 oil (as recommended by BGH, the best Type 9 specialist out there) and that does not go smelly after a few years use in a hard-used gearbox. Made a pleasant change! but that would be OK in a triumph box. I don't see any advantage in thicker gearbox oil, better quality yes.

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Hello Nick,

I can certainly agree to Red Line lubricants, I use their MT-90 fully synthetic gear oil in my Daimler gearbox which is now a Toyota W58 5-speed unit, from a Lotus Excel. Red Line provide excellent products and their prices are not off the radar either.

Regards.

Richard.

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4 minutes ago, Nick Jones said:

Also use Redline MT90 in the W58 in my Vitesse.

Excellent news & better than a manufacturers endorsement, in my book, Nick !!

Best wishes.

Richard.

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8 hours ago, Nick Jones said:

Been using this for about 12 years

https://www.opieoils.co.uk/p-1023-red-line-heavy-shockproof-gear-oil-75w-140.aspx

looks like blood.......

Hello All 

                I have been using this for about 7+ years and it does not seem to go black!

Not the cheapest but as all say differentials are not cheap either!!!

Roger 

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Using EP140 in the diff sounds interesting. But I would expect the higher viscosity would be a problem in overdrive gearboxes and could make the overdrive slower/reluctant to engage.

 

Nope, i use it in me ODs, and it goes in / oot ne probs at all.

the 85/140 is just like use,n a 20/50 engine oil really,

  supposedly thinner when cold, supposedly  thicker when hot

 

It ne probs at all drill,n diff in situ

drill a 5/16 / 8mm first, oil will no fly oot all owa the spot,

meb,e a wee dribble doon the drill bit,  honest.

then drill bigger, either a taper or a straight thread.

taper is best, as dont ev t,worry about the base sealing

GB sump plugs ok they got a magnet in em

yer fill plug, bung one in thea as wee,l it,ll catch moer sheite

as ive found oot

 

Fill,n it, get yer selves yan of thee,s handy thing,ys

very handy they are

https://www.ebay.co.uk/itm/Sealey-Oil-Suction-Hand-Syringe-Gun-Pump-Gearbox-Fill-Extractor-500ml-AK47/390974104414?hash=item5b07df635e:g:~WsAAOSwQLVd5mh8

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On 20/04/2020 at 18:11, GT6M said:

It ne probs at all drill,n diff in situ

drill a 5/16 / 8mm first, oil will no fly oot all owa the spot,

meb,e a wee dribble doon the drill bit,  honest.

then drill bigger, either a taper or a straight thread.

taper is best, as dont ev t,worry about the base sealing

GB sump plugs ok they got a magnet in em

yer fill plug, bung one in thea as wee,l it,ll catch moer sheite

as ive found oot

Thanks Marcus. What tap size for the threads?, to fit either taper /straight plug,  magnetic in my case.  The female threads are always straight I assume, It's the plug that' tapered?.    

Cheers, Dave

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to back up the GL4   GL5 problems we manufacturing trucks for years had diffs to run on GL4  we had the renault buy out and supplies took a 

change to their specs and without knowing GL5 was introduced , followed by  warranty boxes of diffs with rubbished thrust cups on the planet gears in the diff

soon advised by our metallurgist it was degraded due to oil attack   this  unkown simple change  cost a fortune 

less of a problem on gearbox but on high power diff units where   temperatures are way higher and the loading undertaken was  disaster to what had been 

very reliable units with years of reliability ...wrecked by GL5

Pete

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Hi Pete,

 Today a lot of gear oil marked as GL-5 are fine in the diff. Some of the early GL-5's were not as you have witnessed.

I have a "white paper" somewhere about API GL-4, GL-5, MT-1 & MIL-PRF-2105E.
I personally would not use an oil that was only marked GL-4. There are far better oils out there in all respects apart from cost.

I am not talking about gearboxes or OD's.

Cheers,

Iain.

 

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2 hours ago, SpitFire6 said:

Hi,

 The Penrite Full Synthetic SAE 80W-140 gear oil is API GL-5/6.

Surprised nobody has said it must be GL-4!

Good.

Cheers,

Iain.

 

Iain, they do state that PRO GEAR 80W-140 (Full Syn.) is "Compatibility with copper alloy components" (under "benefits" tab) - i.e. yellow metals. Some manufacturers do have similar statements, without which I would not risk using a GL5.

Cheers, Richard

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4 minutes ago, rlubikey said:

Iain, they do state that PRO GEAR 80W-140 (Full Syn.) is "Compatibility with copper alloy components" (under "benefits" tab) - i.e. yellow metals. Some manufacturers do have similar statements, without which I would not risk using a GL5.

Cheers, Richard

Hi,

 Yes. Sometimes the manufacturer makes the choice easy.

My point was that it does not have to be GL-4 Only oil.

Cheers,

Iain.

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