Please help re 99 D2 not going into 4th

L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
Hi all,

Back from a long break while I've been head down, ass up...as usual :)

On a drive recently, I've noticed that my 99 D2 is taking much longer to change into 4th gear.

I'm hitting 60km/hr (37 Mph) and it's still in 3rd. If I take it to around 72-75km/hr (45-47Mph) it changes into 4th.

Everything else seems to be OK, ie torque converter lock at around 80km/hr(50mph) etc.

Should I replace the (only if red) transmission oil and/or the filter or should I be looking somewhere else?

Not sure what to do.

Cheers and TIA

Erron
 
L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
That's OK Marc...I thought the D2 didn't have a kick-down cable but you certainly made me think :)

Any other thoughts?

Would changing the girlyman fluid and the girlyman filter (does the d2 have one?) fix this?

Cheers

Erron
 
D

dirtygas

Well-known member
Sep 10, 2006
70
0
I don't mean to insult you, but could it be that you have it switched into sport mode and that is why it is shifting at higher RPM's?

Dirtygas
'00 Disco II, SE7, CLD
_ still off road
 
H

Herkvet

Well-known member
Dec 16, 2004
291
0
This is a tough one:)

Changing the fluid and filter certainly can't hurt.

Something I pondered on--any decrease in engine torque will be sensed by the transmission and result in later shifts. Since 4th gear seems to be the only issue, maybe something as simple as a dirty air filter or lower grade fuel is enough to bump up the 4th gear shift point in the transmission's ECU map. Just a guess--Cheers
 
L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
Herkvet:

Thanks for that. I always use premium fuel so I'll change the transmission filter and oil and take it form there - concentrate on what could reduce the torque.

I've even disconnected the battery in hope that everything will reset, however that didn't help either :(

Oh well.

Cheers

Erron
 
N

nightfever

Active member
Dec 2, 2006
31
0
Tennessee
my 2000 d2 had the SE light on with a P0734 incorrect gear 4 ratio. No run problems. did have a weird shift. Fixed the MAF sensor cleared the codes and no SE light and no more shifting weirdness. On mine i cleaned the MAF sensor with electrical cleaner and put the oring gasket in the air duct where the MAF connects. It had fallen out. just a thought. Some have to replace the MAF
 
L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
Thanks nightfever.

I've just put in a new Pierburg MAF and it's been brilliant (a lot more responsive, so it seems, than the Bosch MAF sensor) so I'm ruling that out for now.

I'll do an oil change in the trans so I hope that'll fix it. If that doesn't then I'll have to consider the Pierburg is stuffed...hmmm...and apparently Pierburg's have a lot longer life than the Bosch units.

Cheers

Erron
 
L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
To all:

Regarding this issue I'm having, I've determined that I need to replace the oil filter for the ZF as well as the oil (as long as it isn't brown) and I was wondering if it is worth doing the valve body seals at the same time?

Also, is there any benefit from cleaning the shift control valves while I've got everything pulled apart.

Finally, LR recommend 9.7 litres of Dexron IID or III to dry fill a ZF, however does anyne know how much I would need for a refill?

Thanks for any help as I haven't done a ZF before and definitely want to make sure I do everything right.

Cheers

Erron
 
L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
Hi everyone,

I'm bumping this so that hopefully someone with ZF Auto experience can point me in the right direction.

I've decided to replace the ZF oil and filter (with Dexron III and only if it's not brown and/or burnt) and I was wondering if I should do the following while I've got everything in bits (in order of hardness?):

1) Replace the seven valve body seals
2) Clean/Replace anything else connected to the valve body assembly
3) Clean the shift control valves
4) Clean the pressure regulator

The reason I am asking this is that it's taking longer to shift into 4th and I'm assuming it's a pressure issue (thus wanting to replace the seven valve body seals).

One thing I also forgot to mention - I had the D2 sitting for two months and from what I've read, it could also be a clogged governor. Should I drop the rear extension and clean that as well?

The reason I'm asking all this is that I want to catch any issues before they become major issues and major dollars.

Cheers and thanks

Erron
 
B

BARMPA

Guest
Hi Lifestyler,
I am having exactly the same issues with my 99d2.
I also have some shift shock at 80kmh where the tranny doesn't quite know what to do.
My problems started after I had the transmission filter and fluid changed at the designated 70000k service (I think).
I have mentioned this on a couple of occasions to my Landrover mechanic only to be told it is normal as 4th is like an overdrive. I disagree as the motor ticks over at 2000rpm at 60kmh in third and only around 1500rpm in fourth. It is an intermittent problem however seems to be more of an issue when it is hot.
Let me know how you go as I feel like an idiot mentioning it to the mechanic when I know something just isn't right and they just brush me off!
Barmpa
 
robertofollia

robertofollia

Well-known member
Aug 3, 2005
555
2
My home is where my Disco is
There is a problem with ZF trannys, they seem to go on forever but performance deteriorates with use, age, wear and tear..
Somewhere (LRO or LRE I think) I read that when buying an auto, one should perform the following test. Engage "D" and drive gently. From 80 kmh (approx 48-50 mph) the box changes into 4th, this should be done gently, not hesitating. Otherwise, the auto box is not shot but on its last legs.
Try changing filter and oil.
A new, dry gearbox takes almost 9 litres of oil, but take into account the torque convertor is full of oil and that can't be drained. So 4,5-5litres of oil will do.

Empty old oil, undo de pan, filter and pick up tube. Assemble tube in new filter, reassemble. Fill from inside up to level. Make somebody start the engine, select all gears, waiting a little on each one, select neutral, continue filling until a small squirt of about 2mm of oil drops out. close filler plug and stop engine. You're done.

As you've only renewed about 50% of the oil it is recommended, after 500 miles, to renew the oil only. That way you'll have renewed about 75% of all the oil, and that's enough for another 24,000 miles or 40K kms.
 
L

lifestyler

Well-known member
Apr 12, 2005
94
0
Perth, Western Australia
Hi Robert,

Thanks for that.

Good to see you're still around...that Pierburg I fitted is still working like a charm :)

I've noticed that you mention that the ZF should go into 4th gear at around 80kmh...shouldn't that be the torque converter locking up at that speed? I always thought 4th was engaged around 60 clicks...

Also, do you reckon I should do the following to improve seal quality and/or pressure while I've got it in bits:

1) Replace the seven valve body seals
2) Clean/Replace anything else connected to the valve body assembly
3) Clean the shift control valves
4) Clean the pressure regulator

Cheers and thanks

Erron
 
robertofollia

robertofollia

Well-known member
Aug 3, 2005
555
2
My home is where my Disco is
Hi Erron,
to be honest I'm a newcomer when it comes to auto boxes as I've never dealt with one. i was toying with the idea of buying an auto D2 V8 to complement my manual, as sometimes I miss half a gear, and the auto is much better when going uphill, the v8 manual with such a looong 5th gear (and 4th too short) is ideal for cruising, but it makes you downshift at the first steep highway uphill.

I send you 2 links here. One is for your'box
http://www.ashcroft-transmissions.co.uk/part_19.html

And the other one is about typical faults related to this gearboxes
http://www.ashcroft-transmissions.co.uk/faq_part_19.html#a38

Maybe, depending on your mileage, or your governor, or the 4th speed clutch, aren't in their first flow of youth.

Is it possible for you to have access to the special tools a dismantling like that requires? You are really lucky. But please keep us informed!
Good luck
 
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