R reg disco 300tdi commercial gearbox oil question.

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Discovan300

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Hi im new to the forum and this is my 1st post please be gental! Lol

After some advice, dare i say it about Gearbox oil for r380 box
I have searched and thers so much debate etc.

My disco had a new clutch put in as well as a new output shaft bearing on the gearbox and i asked for all the oils to be changed
Ie diff transferbox & gearbox.

I was told that theu used 80/90 gear oil in all the running gear.
Since i got the disco back 1st n 2nd are a pain especially down from 3rd to 2nd,
Wheb cold get a little better when warm.
I had no trouble with any gears befor new clutch an oil's.(i know ther was a lots of metal on the magnetic plug from gearbox as mechanic took pic n showed )

Is this oil causeing my bad gearchanges?

From my understanding i should be putting mtf94 in the box.
Is mtf94 much different from 80/90 gear oil?
Iv tryed to find mtf94 but cant get hold of it?

Can i use atf if changed on a regular basis? Or is this a No No?

Thanks.
 
mtf94 is available from gsf plus others , have read elsewhere :eek: that atf was cheaper so they stuck with it in their LT77 box , but would it be any good ?!? you pays your money yous take your chances ! , RIMMERS are another supplier , used in honda box's aswell made by carlube
 
Last edited:
Many billions of miles have been done in Land Rovers using ATF as recomended by Land Rover. MTF is just a development on ATF and is the same thickness, personally I reckon it's just ATF without the colour, I have no proof of this, just a theory so don't start waving your handbags at me.
 
Soloby Rob said:
Many billions of miles have been done in Land Rovers using ATF as recomended by Land Rover. MTF is just a development on ATF and is the same thickness, personally I reckon it's just ATF without the colour, I have no proof of this, just a theory so don't start waving your handbags at me.
Click to expand...

Doh .. one is Atf, the other Mtf .. the difference is A and M.

FFS is you fick?
 
andrew j said:
mtf94 is available from gsf plus others , have read elsewhere :eek: that atf was cheaper so they stuck with it in their LT77 box , but would it be any good ?!? you pays your money yous take your chances ! , RIMMERS are another supplier , used in honda box's aswell made by carlube
Click to expand...
atf was used in r380s as well ,mtf may be slightly better but atf changed regular as you should any oil will be as good as most
 
barmatt said:
Not anymore, land rover changed their mind and now recommend mtf94.
Click to expand...
they didnt change there minds in that atf wasnt good enough ,just mtf supercedes it ,ive rebuilt both r380s and lt77s and never found one using atf that needed a higher spec oil ,just more servicing
 
My understanding depends on the box. Not that I'm that interested as I drive autos.

When the LT77 (from Leyland Transmissions with a 77 mm shaft spacing) was first fitted by LR/Rover in 1977, the recommendation was for a stock manual gearbox oil MTF.
Sadly, this broke the boxes. The LT77 is unusual in that it has a tiny internal pump with a little plastic impeller so when cold, the thicker MTF fluid causes the pumps grief, lubrication would be prejudiced and the internals would start eating each other.
After a few attempts at better solutions, they "temporarily" went to ATF in hope the pump could handle that until they found something that was a good match. That was not an ideal solution but it had the advantage of working and it was only going to be short-term. It was left in the box for decades. And the recommendation is still ATF-F now Dexron III.

However, with the passage of time, a whole family of far more sophisticated manual fluids had been brewed, none of which were available 35 years ago.
Reportedly, the LT77 pump can handle them but frankly, many people ask themselves, "why find out?.”

The R380 (R for Rover and 380 for its minimum capacity for torque) was made to replace the LT77. It is a radically altered version of the LT77. The dimensional match is very good and with some fiddling, an R380 can replace a LT77. However, you would be hard put to find a single identical internal between the LT77 and the R380.

Originally, the first versions and their manuals for the R380 called for an ATF-F as well. However, over time the box was improved the recommendation changed to one of the more modern brews, i.e. MTF 94.
Many people are familiar with the LT77 weakness and still insist on using the old recommendation for ATF in R380s
 
Last edited:
discool said:
My understanding depends on the box. Not that I'm that interested as I drive autos.

When the LT77 (from Leyland Transmissions with a 77 mm shaft spacing) was first fitted by LR/Rover in 1977, the recommendation was for a stock manual gearbox oil MTF.
Sadly, this broke the boxes. The LT77 is unusual in that it has a tiny internal pump with a little plastic impeller so when cold, the thicker MTF fluid causes the pumps grief, lubrication would be prejudiced and the internals would start eating each other.
After a few attempts at better solutions, they "temporarily" went to ATF in hope the pump could handle that until they found something that was a good match. That was not an ideal solution but it had the advantage of working and it was only going to be short-term. It was left in the box for decades. And the recommendation is still ATF-F now Dexron III.

However, with the passage of time, a whole family of far more sophisticated manual fluids had been brewed, none of which were available 35 years ago.
Reportedly, the LT77 pump can handle them but frankly, many people ask themselves, "why find out?.”

The R380 (R for Rover and 380 for its minimum capacity for torque) was made to replace the LT77. It is a radically altered version of the LT77. The dimensional match is very good and with some fiddling, an R380 can replace a LT77. However, you would be hard put to find a single identical internal between the LT77 and the R380.

Originally, the first versions and their manuals for the R380 called for an ATF-F as well. However, over time the box was improved the recommendation changed to one of the more modern brews, i.e. MTF 94.
Many people are familiar with the LT77 weakness and still insist on using the old recommendation for ATF in R380s
Click to expand...

Ain't Google great, copy and paste too. ;):D:D
 
I know that that the factory was still putting ATF in the boxes upto 1997/8 not sure after that.
If it was good enough for Landrover then it will be now.
 
discool said:
My understanding depends on the box. Not that I'm that interested as I drive autos.

When the LT77 (from Leyland Transmissions with a 77 mm shaft spacing) was first fitted by LR/Rover in 1977, the recommendation was for a stock manual gearbox oil MTF.
Sadly, this broke the boxes. The LT77 is unusual in that it has a tiny internal pump with a little plastic impeller so when cold, the thicker MTF fluid causes the pumps grief, lubrication would be prejudiced and the internals would start eating each other.
After a few attempts at better solutions, they "temporarily" went to ATF in hope the pump could handle that until they found something that was a good match. That was not an ideal solution but it had the advantage of working and it was only going to be short-term. It was left in the box for decades. And the recommendation is still ATF-F now Dexron III.

However, with the passage of time, a whole family of far more sophisticated manual fluids had been brewed, none of which were available 35 years ago.
Reportedly, the LT77 pump can handle them but frankly, many people ask themselves, "why find out?.”

The R380 (R for Rover and 380 for its minimum capacity for torque) was made to replace the LT77. It is a radically altered version of the LT77. The dimensional match is very good and with some fiddling, an R380 can replace a LT77. However, you would be hard put to find a single identical internal between the LT77 and the R380.

Originally, the first versions and their manuals for the R380 called for an ATF-F as well. However, over time the box was improved the recommendation changed to one of the more modern brews, i.e. MTF 94.
Many people are familiar with the LT77 weakness and still insist on using the old recommendation for ATF in R380s
Click to expand...
apart from the main bearings which take the most load are the same ,till the later r380s were the input and rear l/s were changed,the biggest isue with an lt77 was rear mainshaft spline wear which had nothing to do with oil in the gear box but lubrication issuse in the t/box
 
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