Hi there,

been trawling the various forums and also here too and need a little advice please.



I have had my TranX Type 9 running with Millers NT oil for around 2-3 years with not one problem at all. Ive just swapped the engine into my Westy recently and drained the old oil and put in some new...

MILLERS



I'm not 100% sure its exactly what i bought years ago but looking at the spec it seems to tick the right boxes. The problem i have is that on the past 2 track days at Blyton once the car had been round a few laps and took a hammering the box started to be a pig to get into 3rd and 4th(didn't use 5th) and towards the end of the day 2nd along with a little crunching at times. My initial thoughts were that my Helix paddle clutch has come to the end of its life but i had no slipping at all in any gear (maybe thats normal on these?). But then someone said "what oil did you put in the box?".....brain is now putting 2+2 together and getting 5 as i know that the type 9 crunches and behaves oddly when it doesn't have the right stuff in there from what i read.



So dilemma is do i drain the box and add something like Redline Semi or drop the whole lot again and change the clutch?



Any help will be greatly appreciated indeed

[Edited on 15/3/15 by laptoprob]

We use a 75/90 semi in ours never had a problem, from what you are saying in your post would say try the oil as dont sound like the clutch to me

I worked in a Ford dealership when the type 9 was introduced, 1986 ish at a guess?

We had loads of complaints of crunching and baulking and I remember we had a spell of changing the oil for genuine Ford stuff in a lot of cars. Can't remember the grade and no doubt it isn't available any more.

I seem to remember having to fill just below the filler bung rather than level with it too.

Type9's like either a 75/90 gl4 semi synthetic gearbox oil or the proper ford red type9 oil (not mt75 Stuff)

Comma 75/90 semi synthetic gl4 was what a professional box modifier recommended me to use.
I could not find any so used a valvoline semi synthetic gl5 of the same grade with no issues in my self reconditioned type9.

Thicker oils are a no no as there's been issues with it effecting the synchro effect of the bulk rings.

[Edited on 16/3/15 by baz-R]

[Edited on 16/3/15 by baz-R]

Its not the synthetic bit that's the problem but the additives in GL5 oil (inc ones that say GL4 & GL5)
They eat the brass parts inside type 9's
And most modern gear oil is made to GL5 specs....

The comma GL4 is what you want or something to the same spec - a basic old fashioned oil, but exactly what the type 9 needs (as recommended by BGH among others)
But defiantly not anything that says GL5 on it!

[Edited on 16/3/2015 by mcerd1]

[Edited on 16/3/2015 by mcerd1]

GL4 semi synthetic in a type 9.

In recent years I have used Comma and its been fine.

I've been using fully synthetic gearbox oil in my type 9.

10K miles and many track days without problems. Maybe is not the recommended but it's the only one I could get with the correct specifications.

Liqui moly SAE 75W90, Ford ESD M2C 175-A compliant.

Cheers

Was I talking to you about this at blyton ? I'm currently using millers nano mt 75/90 crx and I was seeing 100+ c temps after a 15 min session , I'm going to use the redline mt 90 when I add the cooler . Does it ever have any issues on the road selecting gears ?

quote:

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Originally posted by mcerd1
Its not the synthetic bit that's the problem but the additives in GL5 oil (inc ones that say GL4 & GL5)
They eat the brass parts inside type 9's
And most modern gear oil is made to GL5 specs....

The comma GL4 is what you want or something to the same spec - a basic old fashioned oil, but exactly what the type 9 needs (as recommended by BGH among others)
But defiantly not anything that says GL5 on it!

[Edited on 16/3/2015 by mcerd1]

[Edited on 16/3/2015 by mcerd1]

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quote:

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Originally posted by baz-R

quote:

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Originally posted by mcerd1
Its not the synthetic bit that's the problem but the additives in GL5 oil (inc ones that say GL4 & GL5)
They eat the brass parts inside type 9's
And most modern gear oil is made to GL5 specs....

The comma GL4 is what you want or something to the same spec - a basic old fashioned oil, but exactly what the type 9 needs (as recommended by BGH among others)
But defiantly not anything that says GL5 on it!

[Edited on 16/3/2015 by mcerd1]

[Edited on 16/3/2015 by mcerd1]

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The valvoline stuff is used was GL4&5

I was told that almost all gl4 and 5 have the EP additives that are supposed to be bad for yellow metals inside the gearbox.
It was also put that most gearboxes have these metals in them.
What is should avoid is hypoid and EP grades of gear oil for final drives .
Five or six oil manufacturers listed gl5 oil's?
Also a gearbox reconditioner who supplied my gaskets and bearings said that any correct viscosity gear oil will be fine and said "type9 boxes are very common back in the day" we never had any issues

All a bit confusing

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quote:

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Originally posted by froggy
Was I talking to you about this at blyton ? I'm currently using millers nano mt 75/90 crx and I was seeing 100+ c temps after a 15 min session , I'm going to use the redline mt 90 when I add the cooler . Does it ever have any issues on the road selecting gears ?

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I have a tranx straight cut type 9 in my car, i use Lucas 75/90 synthetic mixed with the Lucas heavy duty 85/140 oil. Keeps the box reasonably quiet for a straight cut, runs cool and the gearbox has been in for around 8 years without any problems what so ever (touch wood!! lol). I've also drilled/tapped for an oil drain plug and i change the oil every 2 years or so.

May not fall in line with the normal advice but it works for me

Ian