Notchy in 2nd/4th

[honestjohntoo]

JumboBeef said:

but how does this differ for an LSD?

AH? Now, personally I don't have the experience to know the answer to that question!

But in a moment of caution, I recall being told quite firmly on another forum that my added Molyslip process for a regular differential axle is not appropriate for an LSD rear axle.

That being so, I now add the mentioned clause, because I am the one offering the differential advice, better for me to be 'not wrong' than 'wrong' for LSD.

Subsequently I found this on a Molyslip site:

DO NOT USE Molyslip MTS in wet clutch systems (used in certain motorcycles and ATV’s), automatic transmissions, limited-slip differentials or transfer cases relying on friction to produce motion. Use Molyslip ATS in these applications.

Here:

http://www.molyslip.com/products/oilfuel-supplemen...

MTS = Manual Transmission Supplement
ATS = Automatic Transmission Supplement

[adam quantrill]

matt-man said:

The box and diff oil are a piece of cake to do,just a little fiddly... And you need a big spanner for the box oil! Check it before you start to avoid disappointment.

The main thing to check is that you can get at and actually undo the filler plugs before letting the goo out ;^)

Yes be very careful what you put into an LSD - you must use the LSD rated oil or you'll trash the friction plates - the bit that does the limited slipping - and don't use molyslip for the same reason. If in doubt whether you have an LSD, use LSD oil as it will work OK in a non-LSD axle.

I remember I put some normal diff oil in mine and decided to check it after a few weeks - it looked like silver paint! So I hastily got some castrol difflock oil and it's been fine since.

[JumboBeef]

Thanks.

How much oil do I need for the diff?

[JumboBeef]

This is the only stuff Halfuds sells (other than own brand). Please tell me I've bought the right stuff!

[marcus1875]

That looks like its for an automatic?

[ElvisWedgely]

That is automatic gearbox fluid or power steering fluid. That is definitely not the right one. You need gear oil which is completely different. Go to a proper motor factors shop where they know what they are talking about. In halfrauds, the school leavers working there don't have clue. Halfrauds is for little old ladies looking for screennwash.

Tony. TCB.

[adam quantrill]

... and da yoofs lookig fer blue LED's to attach to their washer jets....

[JumboBeef]

Cheers. I'll get it changed tomorrow.

I had two of them telling me "this is what you need...."

[JumboBeef]

Struggling to get the right oil. When people say Mobil 1 0W/40, the only oil I can find of this grade is engine oil, not gear box oil..

[ElvisWedgely]

JumboBeef said:

Struggling to get the right oil. When people say Mobil 1 0W/40, the only oil I can find of this grade is engine oil, not gear box oil..

Jumbo. Go on Erbay and type in search MTF94. You'll find plenty there and cheap.

Tony. TCB.

[V8 Fettler]

LT77 was designed for ATF, hypoid type gearoil can wreck the pump. I use difflock but it's still not the best gearbox

[carsy]

JumboBeef said:

Struggling to get the right oil. When people say Mobil 1 0W/40, the only oil I can find of this grade is engine oil, not gear box oil..

Yes its engine oil you want.

[honestjohntoo]

JumboBeef said:

Struggling to get the right oil. When people say Mobil 1 0W/40, the only oil I can find of this grade is engine oil, not gear box oil..

OK! Confused, methinks, but let me clarify. What you found is what I am advising but from here on, it all depends whose advice you wish to follow?

If you are following mine the you will want to buy approx 2 litres of exactly as mentioned - Mobil 1 0W/40 (or Castrol RS 5W40) - yes it is an engine oil and yes that is exactly what I am advising, together with the also mentioned Molyslip manual gearbox treatment.

Follow my instructions to the letter and providing your LT77 box is neither worn out (ie bujjered or otherwise damaged) and the remote system is secured with good rubber bushes then the behaviour of the gearbox can be significantly improved.

If you want to follow other members' advices then it may be they need to be more explicit, leaving you with less doubt as to what you need.

If you decide to mix and match the advices, then it becomes a personal experiment for you that can have a different outcome.

By that - I mean, when I did my experiments in 1996, as detailed on my web page, my box was at 'last chance saloon'. I was so delighted with the outcome, which has been confirmed by many other users of the LT77, that the detailed cleansing program combined with Mobil 1 0W40 or Castrol RS 5W40, Plus Molyslip might now be considered as a worthy investment of time and money (lots of time, but not much money).

Which ever way you go, may your God be with you!

Oh Yes! If you are NOT able to get any improvement to the gear changing using the advices found hereabouts, then you surely will have a useless gearbox and the cost of finding out is only a couple of litres of oil and a squidge of molyslip. PLUS, you didn't have to remove the box to find out.

On the downside, it is hard work, though, especially for wrinklies.

Edited by honestjohntoo on Saturday 16th August 16:59

[adam quantrill]

Agreed - it is the engine oil. If you get 4l it's cheaper per litre and you have enough for the next change in 20k-30k miles ;^)

[JumboBeef]

Sorry for being dim, but there is more than one Mobil 1 listed. I assume it is "new life" 0W/40, £49.99 for 5L?

http://www.halfords.com/webapp/wcs/stores/servlet/...

[adam quantrill]

Yeah that looks like the one - with the goldy/brown label.

[JumboBeef]

Thanks.

People have rebuilt a complete Wedge with shorter threads than this

[JumboBeef]

With a massive thanks to Marcus, box flushed and refilled. However, it is still notchy....

[adam quantrill]

Well - it was worth a try... and it will be generally smoother from now on. Have you also checked the remote linkage thingy? (Pull up on the gearstick - does it move up and down?)

[ElvisWedgely]

Check that the reservoir is full and perhaps bleed the clutch hydraulics just to eliminate. From what you describe though, it sounds to me like the synchromesh is worn in second and fourth. Seems quite popular on these gearboxes when they age.

Tony. TCB.