98 Jackaroo Auto Problems

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98 Jackaroo Auto Problems

Unread post by beach » April 15th, 2015, 6:48 pm

My parents have a 98 SE V6 3.5 Auto. 220k kms.

The transmission has developed a problem in that it sometimes does not want to change up.

For instance from a standing start, selector in "D", it just revs like its in neutral. If first is selected manually it will go into gear. Going up in gears manually, sometimes it will change up, sometimes not.

They have had it looked at by a local transmission specialist that diagnosed it as requiring a rebuild. Cost around $3500-$4000.

Googling about brings some mixed results. Apparently Holden deem this box to be "sealed for life" so it doesn't get any attention as part of scheduled servicing. For my mind this can result in the oil becoming a sludgy mess and any filters getting blocked. I have also read of sensors getting dirty or faulty resulting in bad operation.

I reckon in the first instance, it would be worth having the sump removed, the oil changed and any filters, etc being cleaned, etc.

As they are pensioners they really don't have the coin for expensive rebuilds.

Any help greatly appreciated.

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Re: 98 Jackaroo Auto Problems

Unread post by Jimmy Wood » April 15th, 2015, 8:06 pm

I suspect it probably is on the way out, but sure, changing the oil wont hurt, and any filters you can find. It might give it a few more miles before it does go out of action.

But first, if you haven't already, just check that it has the correct fluid level in it now - eg warm it up, and check with engine running. Some want to be in Park, others in D, but all that will be in the owners manual or service manual.

Should be pretty easy to change the fluid, just remove the pan. If that cant be done, drain it out the cooler hose. Should be a filter there too.

Normally, though, when you changed the fluid you have to adjust the bands (in older ones anyway) so it may be a bigger job than you expect, but sure, new fluid wont do any harm and Id try that before rebuilding it.

Get a few quotes for the rebuild but, as 4K seems a bit too high. I got my TH700 in my VP commodore done, full rebuild for less than 2K. Went for at least another 200,000kms after that too, so wasn't a dodgy rebuild by any means.

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Re: 98 Jackaroo Auto Problems

Unread post by mydmax » April 15th, 2015, 11:48 pm

Because it sometime changes manually the box appears to be working ok. Therefore it could be the governing system not telling the box what to do.
Maybe removing pan and cleaning inside, then refill and before you start remove the return hose to the auto.
Place hose end into bucket and start and run until it begins to blurt.
Then refill and do it again and again until the return hose flow runs CLEAN with fresh looking fluid.
Replace hose, refill to correct level and drive it and use all change positions to make all internals work through their normal operation.
Until it is hot with new fluid you won't be able to tell if it needs a rebuild or is simply just sluggish.

A bit of work and about 12 to 15 litres of new fluid should determine if the systems will work normally.
It may require getting it hot before any noticeable improvement.

PS. Nearly everyone who ever changes trans fluid DO NOT EVER replace all the fluid, ie, in the torque converter and so gunge does build up to cause problems.

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Re: 98 Jackaroo Auto Problems

Unread post by cuvier100 » April 16th, 2015, 12:35 pm

I think you will find the auto expert's opinion is correct as he would have examined the fault codes.

The next step is to drop its sump and inspect for sludge etc but be preapred for the extra work as it is not worth putitng it back together unless it is fixed. These gear boxes are reliable but they do fail and you dont hear anything or sense anything is wrong until its too late and major damage has occurred.

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Re: 98 Jackaroo Auto Problems

Unread post by terravista4110 » April 22nd, 2015, 3:30 pm

I am far rom being an expert, but our Monterey had similar but not as bad symptoms a few years ago.
The local (Non Holden/non Auto Specialist) said the gearboxes are sealed units, but still need periodic servicing.
He dropped the bottom off the gearbox cleaned it up and replaced a filter, refilled with new oil and it is still fine 100 000km later.
This may well have been a con job, and what he showed me could have been off a volkswagon beetle as far as I know, but whatever he did worked.
I would be trying a couple of other things before a rebuild.

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