2003 UZJ100 A750F transmission dying?

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Joined
Jul 11, 2017
Threads
16
Messages
182
Location
Hobart, Tasmania, Australia
Hi all.
I suspect my transmission is on the way out. :(
I believe its the A750F 5-speed transmission.
The vehicle is a 2003 Toyota Land cruiser GXL 4.7 V8 Auto UZJ100R with 230,000KM on the clock.

I've only been driving the car for the last week or so, after purchasing it second hand 4 or so months ago. (Details below).

THE PROBLEM:
I think the gears are slipping, and its especially noticeable in the mornings, while under acceleration, and while going uphill. At first I thought it might have been a blocked fuel filter, as it would lurch a bit, sort of like you had a bit of crap in the fuel tank, so I switched tanks and the issue seemed to disappear, until it recurred and I've since confirmed it happens on either tank.
This is during my trip to work, which only takes around 15-20 minutes.
Its intermittent.

I have not noticed it in the evenings, despite driving the same incline hills and bridges, which is odd, however perhaps I'm slower on the way home from work, and haven't noticed it...Its probably a few degrees warmer in the evenings... around 8 degrees C compared to around 2-4 degrees C in the mornings.

WHAT I'VE CHECKED:
I checked the ATF level via the dipstick, and it may be a little bit low.
The procedure I used was to drive the car to the local Repco store to buy some ATF fluid, got lunch, bought the car back, left it idling for around 15 mins, (a total running time of around 30mins, but most while idling) then, while it was idling, on level ground, I cleaned off the dipstick, reinserted it, removed it and inspected.

The dipstick seems to have 4 notches, two at the "hot" part, about an inch apart, and a couple of inches down two at the "cold" part, also about an inch apart. When I checked, the level was approx half way between them, ie, about halfway from the very top "hot" notch, and halfway from the very bottom "cold" notch.
Now, I'm guessing that would indicate that the fluid may be low, given the engine should be hot, and if so, I'm guessing the line should be between the two "hot" notches?
Does that sound correct?
Or should I actually drive the car for 30 mins or so to make sure its hot?

I also had a look at the fluid, and it was bright pink, and I couldn't see any obvious signs of metal or other foreign particles in it, although I will retest it with some clean paper towel and a magnifying glass tomorrow.


BACKGROUND
I purchased this vehicle second hand near the start of the year, then drove it home 2000KM.

On the drive home I didn't notice this issue, although admittedly most of it was continuous highway driving.
I DID however notice on that drive that sometimes when I rapidly accelerated, such as when going to overtake, sometimes the engine would rev high without actually doing anything, like it wouldn't drop down a gear, and/or almost like it was in neutral, although it didn't actually lose speed, it just didnt gain speed.

As the vehicle was unregistered, and purchased interstate, I had to do a fair bit of work on it to get it up to roadworthy, although none of the work so far has been on the engine or transmission. (Nearly everything else in it though, lol, but that's another story).

Its got 230,000KMs on it, and has been used a lot in the sand, from the amount of rust...
The service manual had each check up until about 7 years ago...so I suspect a lot of servicing hasn't been done in years...
---------------


Anyway, after working on it for three months or more on weekends, its finally registered and roadworthy.
However, now I'm worried I may be looking at getting a new transmission.

Does this sound terminal to you?
I can't imagine topping it up a bit will really help matters...

Given I suspect the servicing of this vehicle has been fairly nonexistent, would you advise dropping out the transmission cover and cleaning the mesh/filter thingy and adding new ATF?

I was already planning on draining the ATF when I get the engine serviced.

Please note, while I think it is the transmission, I'm not a mechanic, so I could be completely wrong. :)
Its just an assumption, but I can't rule it out or point to anything else yet.

Thanks for any advice you can provide, and if you need any more info, please let me know.
 
Find you a shop that specializes in transmissions and stop by there and chat with them. Since youre not an expert, I would suggest talking to one.
 
With the rather short drive, could it be as simple as you're experiencing the torque converter not locking up until the ATF is up to temperature?

Although it is a completely different transmission, we had a somewhat similar issue on my son's 2000 LC that a ATF exchange cleared right up.

You are aware that by "dropping the pan" you will only drain about 1/3 of the ATF? If you're trying to swap out the ATF, you would have to repeat the process a few times or do a "fluid exchange".
 
Thanks for the replies.

Thanks jLB, that's certainly a possibility.
I've never owned an auto before, so I'm not familiar with driving one. :)

I think I'll change the fluid on the weekend and hope for an improvement.
Yes, I did read about how dropping the pan will only drain some of the ATF, but I thought it'd probably be best to clean out the mesh filter thing first, then I think I'll try to do the fluid exchange once I've got it back on.

Thanks for your help.
 
What color was the transmission fluid?
The "hot" mark is not for the engine temp, it is for the transmission temp. You are in the safe range.
Change the fluid, but to me this sounds like the classic the clutches are slipping and the transmission is on it's way out.

If that is the case, changing the fluid will help, but the problem will come back.
 
Thanks Spike.
That's not what I really wanted to hear, but suspected it could be the case. :)
Yes, I'll change the fluid and hope...and meanwhile start saving pennies for a s/hand transmission. :)
 
oh, and sorry, the colour looks bright pink/red, like new.
There was a bit of grit on the paper, but I suspect it was attached to the dipstick.
I'm going to clean the dipstick and retest and check for any particles...

Yes, I gathered the temps were re the transmission. Thanks.
I think I'll need to drive it a bit longer to get it hot, then recheck the levels.
Thanks again Spike.
 
It does not take long for a transmission to get to temp, a properly working one will be fully warm in a mile or so.

The grit could be the clutch material as the clutches disintegrate.

It is not uncommon for unscrupulous people selling used cars that need a major repair to mask the problem with a cheap fluid/filter change. I am not saying this is whats happened to you, I'm just saying some people do that.

If that is the case, you can buy magic in a can, add it to the transmission and drive it until you can afford a rebuild or a used one.
But cross that bridge if you get to it.

Valvoline MaxLife transmission fluid has special additives that help with leaks and rough shifting. That is what I recommend you use.
 
I have noticed a similar issue on my 04 with 264k miles. When accelerating (usually in 4th or 5th gear) there is a stutter in the acceleration, feels like a slight jerking or rocking. It seems worse right before I give it more gas and it downshifts. After the downshift it is not really noticeable.

Unlike the OP, I have not felt any indication of a slippage, and never seen my RPMs increase, only in rare occasions do the RPMs drop by a 100 or so when climbing steep grades.

So far I changed the fuel filter and cleaned the MAF. Neither has eliminated the issue. The next thing I'm going to try replacing is the fuel pump. On a recent 1,000 mile road trip I believe I noticed that it was worse on a full tank of gas. I would have thought the inverse would be true though.

Also, I just towed a 22' travel trailer a few weeks ago and kept it in 4th gear. I figured if this was a transmission issue it would be even more apparent towing, but it didn't occur at all.

I have yet to do a drain/flush of my ATF since I have a closed transmission, but will probably get to that in the coming month.

I'm waiting until I've exhausted all other options or the problem gets worse before I take it to the local transmission shop.
 
I have noticed a similar issue on my 04 with 264k miles. When accelerating (usually in 4th or 5th gear) there is a stutter in the acceleration, feels like a slight jerking or rocking. It seems worse right before I give it more gas and it downshifts. After the downshift it is not really noticeable.

Unlike the OP, I have not felt any indication of a slippage, and never seen my RPMs increase, only in rare occasions do the RPMs drop by a 100 or so when climbing steep grades.

So far I changed the fuel filter and cleaned the MAF. Neither has eliminated the issue. The next thing I'm going to try replacing is the fuel pump. On a recent 1,000 mile road trip I believe I noticed that it was worse on a full tank of gas. I would have thought the inverse would be true though.

Also, I just towed a 22' travel trailer a few weeks ago and kept it in 4th gear. I figured if this was a transmission issue it would be even more apparent towing, but it didn't occur at all.

I have yet to do a drain/flush of my ATF since I have a closed transmission, but will probably get to that in the coming month.

I'm waiting until I've exhausted all other options or the problem gets worse before I take it to the local transmission shop.

A "closed" transmission only means there is no dipstick, it still needs regular service.
 
Thanks again Spike555.
I'm guessing I got scammed by the seller, given the amount of work I've had to do, and the sellers original description. :)

So far, I've replaced 3x calipers (s/hand dealer had sold the other one...), front rotors, brake pads, exhaust, front left lower ball joint, handbrake hub assembly, door lock assembly,door handles, front light, indicator, bushes, and... some other stuff too, oh yeah, and the steering rack, which was a right PITA, bash plates, etc. Also had other issues - ABS warning lights, etc, but were all just bad connections.

This is from a seller who said it was "mechanically fine".
Lesson learned - don't buy a car sight unseen.

Set of new tyres, and finally, months later registered and roadworthy...driving it for a week, and now noticed this issue. Grrr....

I'm going to get a mate to replace the transmission fluid with the standard Toyota T-IV or whatever its called, as I've already bought it, and see how it goes, but if its still an issue I'll look around for some Valvoline MaxLife transmission fluid and give it a try.

Looking at s/hand transmissions I can get one from a dealer for $650AUD (around $500USD) plus shipping, with 3 months warranty... but not sure whether I should rebuilt the current, buy the second hand and get that rebuilt, or just buy it and replace it and hope...
I guess I'll have to look into how much a rebuild costs...

Thanks again Spike555.
 
Hi WestwardCruiser, and thanks for the input.

"When accelerating (usually in 4th or 5th gear) there is a stutter in the acceleration, feels like a slight jerking or rocking. It seems worse right before I give it more gas and it downshifts. After the downshift it is not really noticeable."

That sounds the same symptoms as my issue, especially in 4th or 5th gear...
When it occurs I've been dropping it back to 4th manually and it seems to pick up fine.

I'm usually driving up a fairly shallow hill at around 65-70KM/H when its most noticeable.

I first thought it was a fuel issue, but I'm getting pretty sure its the transmission unfortunately.
Just in case, I switched to the sub tank and the symptoms persisted.
I thought that there were two separate fuel pumps and filters, one for each tank, although I'm not positive about that.
If so, then that would rule out the filters, pumps, and crap in the tank, unless the tanks had crap in both.

I did run a bottle of injector cleaner in both tanks a week or two ago, so I guess possibly it could be caused by that, or crap in the tank, blocking the injectors, but I don't really know... and the more I read, and the comments, make the transmission seem most likely.
The motor idles well, and if, while in park I rev it, it sounds fine, although its obviously not under load so you probably cant tell from that anyway...

Is anyone familiar with any issues with using injector cleaner and then having issues such as this?
Just to put it out there? :)

I haven't checked the MAF, so might have a look at that. I think the OBDII reader I've got can read that data, so I'll try to find the normal values for it and compare them to mine.

"I'm waiting until I've exhausted all other options or the problem gets worse before I take it to the local transmission shop"
Yes, well, the transmission will be a pretty hefty price tag, so hopefully for both of us its not the issue, but I think, for my issue at least, its looking more likely.
 
Thinking about it, the only thing I've done to the engine/trans, part from checking the oil and coolant, is adding the bottle of injector cleaner...
The bottle said it treated two tanks, so I put two thirds in the main tank (90ish litres) and the rest in the subtank( 45ish litres), then filled them both.
Its only been since then that I've noticed it... but I suspect that this might just be wishful thinking...
 
Thanks for that jLB, and yes, being a 03 model mine shouldn't have that issue.
Similar symptoms though, so it may be of help for westwardCruiser.
I think I'll go through a couple of tanks in case its the injector cleaner stuff I put in there.
Also there was a bit of pretty old petrol in the tank before I filled it, which could perhaps cause issues...
Thanks again.
 
Another potential possibility, although @westwardCruiser would appear to be in the correct model years and @joshAUST would appear not to be:

2004 Transmission Issue - Washboard Vibration, Shudder

That is interesting, thanks for sharing. It doesn't seem to really match what I'm experiencing though. I notice it at higher speeds and RPMs are always over 2k, somewhere closer to 2,200 - 2,400 I'd say.

I also wouldn't describe my symptom as washboard or shudder, it is definitely not harsh and more like a gentle rocking - almost like its going on/off the gas ever so slightly.

I'll provide an update should I figure it out.
 
For what it's worth...

How's your system voltage? Alternator and battery?

I had a transmission-slip scare with my Lexus. Slipping off the line, during shifts, etc. Turned out to be a loose negative battery terminal. Tightened it down and been perfect ever since.

Computers absolutely hate low voltage.

I could be completely off here, but it's easy and time well spent for other reasons.
 
OK, so my original diagnosis was wrong. :)
I think the issue was with the fuel... it was off the road for 3-4 months while being fixed, so the petrol was pretty old, then I added some injector cleaner, and then topped it up with crap 91% fuel...so the whole tank was probably a bit iffy.

I think the issue has been resolved since I've finished that tank and filled it up with better fuel, 98%.
I took it for a drive today, and it was heaps better, 98% better in fact, lol.
Thanks for everyone for their input, advice, etc, its appreciated.
@westwardCruiser -I hope you sort out your problems as easily and cheaply!
 
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