Improving the MN gearbox shift feel & operation.

[snowman]

Should have bought an auto lol.

don't think it is all rosy on the other side of the fence mate...

Our MK manual (not sure if it is the same spec but it was the one they beefed up after a number of failures) is now 10 years old and has had bad rollover from day one and never got worse, multiple mechanics have advised it is not an issue. So no concerns in that department.

regarding changing gears it is terribly clunky between the lower gears, particularly going down when cold. The gearbox was removed and second gear synchros were replaced under warranty at the end of the 5 year extended warranty. it was better for a few months but went back to normal. As with you guys it is far worse when cold and it shits me to drive it (it is my wifes car) but it is significantly better when warmed up.

so no new news to you guys except that it has not got any worse over the last 5 years once it 'settled back' to normal.

it was one of the reasons i went with auto this time, but we have our own problems.

[Steane]

There are probably no real differences between the MN and ML gearboxes so I'll provide my experience.

For a truck gearbox it's pretty good. With the original oil it was notchy and didn't like finding second when cold and sometimes when warm.

With Synforce oil it improved out of sight (I changed all fluids over to Synforce about 6 mths ago). No issue with second, cold or warm and quite a nice change. Certainly better than a lot of others out there in the same vehicle type.

My advice is change the oil asap.

[Kegsy]

Yeah I've done the oil, this is def a syncro problem.

Double clutch and she slips in smooth as silk.

With new oil the box actually feels quite good at the moment especially going up the cogs. I'm just being locked out of 3rd and 2nd gear if downshifting without matching the revs between motor and box.

[sierra]

My syncros are fine but I often[most of the time] double de clutch down into 2nd just to make sure it stays good.
Sounds good too.

[Kegsy]

Been to mitsi this afternoon, yep gearbox is gooooooone.

Brand new box on order. Now we play the waiting game.

At least it's getting fixed this time, happy as Larry!

[Longranger1]

Good one Kegsy! Hope it goes well for you.

[boatpc]

With Synforce oil it improved out of sight (I changed all fluids over to Synforce about 6 mths ago).

Do you mind if i ask which oil it is
I've done the engine with the cruiser oil, which im happy with and would like to do the gb

[Steane]

With Synforce oil it improved out of sight (I changed all fluids over to Synforce about 6 mths ago).

Do you mind if i ask which oil it is
I've done the engine with the cruiser oil, which im happy with and would like to do the gb

My order details are below, for engine, diffs and gearbox/transfer. Prices may have changed since I ordered this in March this year, but it gives you an idea.

10 Litres Cruiser Oil is $67.01 +gst
4 Litres Crusier Diff 90 is $36.87 +gst
1 Litre Cruiser Diff 90 is 12.33 +gst
4 Litres Cruiser Gear 80 is $35.96 +gst - this is the gear oil obviously
1 Litres Cruiser Gear 80 is $12.13 +gst

[boatpc]

Thanks for that.
Are you buying straight from synforce
I went through aussie auto and paid 80 for the oil.

[Trough Lolly]

just touching base, ive been running the Penrite Syn in the gearbox for 20,000kms now.

Its sometimes notchy in cold weather mornings, but as stated, once its upto operating temp its pretty good.
Going from 3rd to 2nd down-change in winter time gets a bit notchy.

Still worth doing though, feels better than the stock shit.

[Longranger1]

^^^^^ I find the same thing when its cold. All good when it has warmed up a bit - easy to drive around the problem, just double de-clutch.

Way better than the stock oil that's for sure.

[sierra]

Is that the Sin Manual Trans 75W-85?
I've been running that for some time too and agree the changes are better. I usually double de clutch down into 2nd just because I enjoy doing it but it snicks in without doing that pretty smoothly.

I had the 45,000km service yesterday, $468 with me supplying the oil and reported the gearbox noise at idle, hot with the clutch out. It's virtually gone at 1,000rpm and the guy sent out with me to listen after I got it hot[110kph for a while] actually agreed he could hear it. That was a good start.
What he suggested it was and I have to admit it could be, is backlash in the gears at low revs being resonated by the diesel engine.
Anyway, as he said, it's reported now and if it gets worse they will have to do something. If it craps itself i've done my bit and it's got 10 years and 160,000km of warranty.
He mentioned that a 75W-85 grade could now be used and I confessed I had changed it for the above to try to shut it up and he agreed there was nothing else to do but see what happens over time.

Shame about the noise though!

[Longranger1]

[quote="sierra"]Is that the Sin Manual Trans 75W-85?
I've been running that for some time too and agree the changes are better. I usually double de clutch down into 2nd just because I enjoy doing it but it snicks in without doing that pretty smoothly.

Sure is. I wouldn't worry about 'roll over' noise. It is simply the changes in angular velocity causing noise from gear tooth backlash. Very common and usually benign. Higher viscosity gear oil would quieten it but would cause other problems.

[sierra]

Sure is. I wouldn't worry about 'roll over' noise. It is simply the changes in angular velocity causing noise from gear tooth backlash. Very common and usually benign. Higher viscosity gear oil would quieten it but would cause other problems.

That fits in well with what the tech thought and feels more comfortable than imagining the bearings were crapping themselves. Thanks.
Imagine if it was one of those silky smooth, quiet V6's sounding like a diesel at idle!

[central4]

Has anyone tried using 80W/90 oil in the g/box an t/case? Been using Castrol stuff for years in the trucks and tractor. Or is it a bit too thick for the Triton box?

[sierra]

Has anyone tried using 80W/90 oil in the g/box an t/case? Been using Castrol stuff for years in the trucks and tractor. Or is it a bit too thick for the Triton box?

I'm pretty sure I tried that early on and it was a lousy gearchange but i'm tempted to try it again.
You have to be careful about the API GL spec. Mitsubishi call for GL4 and I believe it's because there is copper/ brass in the box, might be the syncro rings? Higher specs can corrode those metals.
Penrite Hypoid 80W-90 is GL5 whereas their Sin Manual Trans is GL4+ but states Compatible with copper alloy components and protects against corrosion.
I'll look up the Castrol 80W-90 spec.

[dazza_241]

Guys,
I was keen to try the penrite oil (sin manual 75w-85) due to my 2nd gearbox being a pain in the butt changing from 3rd to 2nd.
where do u get this oil from?
i have phoned nearly all outlets in Newcastle...anyone in Newy managed to buy it?
the people i have rung keep saying they have 75w-90.....is this oil ok? or should i be still trying to find the 75w-85 as used by you guys?
Cheers,
Darren

[sierra]

Guys,
I was keen to try the penrite oil (sin manual 75w-85) due to my 2nd gearbox being a pain in the butt changing from 3rd to 2nd.
where do u get this oil from?
i have phoned nearly all outlets in Newcastle...anyone in Newy managed to buy it?
the people i have rung keep saying they have 75w-90.....is this oil ok? or should i be still trying to find the 75w-85 as used by you guys?
Cheers,
Darren

I just spoke to the tech guy at Penrite and he said Mitsubishi spec is 75W-85 and the only one they have is the Sin Manual Trans full synthetic. It's not expensive.
Try Super Cheap or Repco.

[dazza_241]

tries supercheap....apparently they dont stock it!
tried repco and they only have the 75w-90???
anyone else had any luck?

[sierra]

tries supercheap....apparently they dont stock it!
tried repco and they only have the 75w-90???
anyone else had any luck?

The tech rep said they can get it in for you.
Ask them to get it on their next order so they don't charge for a special order and offer to pay up front. How could they say no?

[killa]

I got mine from Bursons as they had it on the shelf.

http://www.burson.com.au/

[drillbit7]

Finally got around to doing mine at 25,000km (yes, I am a procrastinator) only I used Castrol VMX-M 75W/85. $50 for 4 litres from Repco.
Found it to be excellent, much smoother shifting and quieter operation. I live in the NT so I can't comment on cold weather performance, but based on what I've found so far I'd definitely recommend it.

Cheers
Drillbit

[Trough Lolly]

a mates recently bought a new GLR 2012 MN, only 4 months old and he hates the shift quality..

good work mitsu

[killa]

I lost my good oil at 45k service, time to do it all again *sigh*

[alan_blue]

what do people think about using the gl-4 instead of the recomended gl-3? as far as i know it will corrode yellow metals if we have any in our boxes? do we?