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Vxon's car whore
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This how to is courtesy of vectrolosys (though i would put it in the right place!!)
Hello,

Seeing as there are some auto trans questions popping up, I thought I'd do my write up for changing the fluid. Add any additions you feel relevant.

This information covers the earlier 4 speed box, 5 speed procedure may be similar.

Vauxhall in all their wisdom, decided not to fit a drain plug or dipstick to the transmission. This makes changing and checking the fluid a bit of a difficult process. However, as I found the other weekend, it isn't as hard as it first seems. You'll need the following items.

1 large gearbox sump gasket
1 small sump gasket (there are two)
1 O ring for sump bolt
A large selection of rags and newspaper
Some axle stands, or ramps ideally
7 litres of Dextron 3 transmission fluid
A tin of Wynns auto transmission stop leak (optional)

Make sure that some of the dex is supplied to you in a 1 litre bottle with tube on the end, you'll be needing this .

Get the car raised up, and undo the fill plug. Let the old fluid drain into the bowl you have placed underneath. APPLY THE HANDBRAKE AND CHOCK THE REAR WHEELS
Remove all the bolts around the edge of the large sump, put them in a safe place. There are around 16 of them to remove.

Place a trolley jack and block of wood under the sump, and support it. Get a block of wood and place this between the hammer and sump, give a couple of short taps with the hammer, on the wood, to shift the sump. Lower the jack carefully. The sump will be full of oil, so watch for this. I got it all over the drive when I did it, so be careful. Dispose of the oil in the bowl, and remove the sump.

Now remove the small sump and bring both out. Clean both sumps thoroughly, and remove any gasket material from the face of the sump flange. I used a paint scraper and some white spirit to get a nice clean surface, repeat this procedure on the box itself. Be careful not to damage the mating surfaces.

I left the bowl under the box for an hour, and cleaned the sumps completely.

Get your large gasket and match it up to the large sump. Get under the car and offer the sump up to the box. Whilst holding the sump, place a bolt in each of the four corners, finger tighten for now. Place in the other 12, all finger tight. Ratchet tighten in a corner opposite corner, opposite end corner corner fashion, or a criss cross fashion.

Check each bolt is done up to haynes torque figures.

Get your 1 litre bottle and squeeze fluid into the box.

Refill the bottle and repeat till fluid comes out the fill hole. Place the plug back in and start the engine.

Beware of one of the cats, that'll be above your head.

Remove the plug, worry not, no fluid will be ejected under high pressure, as it'll all be slurping around the box, under high pressure. Continue filling again until fluid can be seen escaping.

Place in the fill bolt. Get the car off the ramps, and select all gear ratios. Take it for a spin, and on your return, check the fluid levels once more.

And that's all you need to do. Dispose of the old fluid safely, via your local recycling scheme, or used oil bank.

HTH

James.
 

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Club Barge
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An addtion to my initial post.

Don't forget to purchase a gearbox oil filter.

I found Autovaux the best for the bits, and spareshq.com the best place to go to buy the auto trans fluid. I used the wynns stuff to solve a leak. You can put this in with the fluid, via the squeezy bottle.
 

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Club Barge
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Pictures Of The Job

Hello,

Some pics of the job.



Shows the Gaskets required for the job



Shows the sump bolts, and the sumps off the car



Shows the magnet that you need to clean



This is extreme, but can be acheived with lots of kitchen roll!!
 

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Very nice pics mate. All very usefull especially the paper / card to put it on when it's out! Must say last time i did anything near gearbox oil it ended up all over the drive and absolutely stank for a good few weeks. That was following a haynes manual doing something to a drive shaft!

One step said pull out drive shaft from gear box which I did, the next said make sure you have a container under it before you remove the driveshaft!

I will be following this though in the next few weeks!
 

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thanks for that

did mine the other weekend as I intend doing a fair bit of towing, gear box smoother and seem to have lost that weird "clutch slip" effect I was getting when accelerating on the motorway.

thanks
 

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I just did a quick and partial change on the auto box on my 2 litre Omega. I removed the fill plug in the rear sump and was able to suck it almost dry with an oil extraction kit. It took just under 2 litres of fresh oil before it was full again. I guess changing 1/4 of the oil each time, say once per year, will eventually do the job. It'll never be completely clean, but it'll never get completely dirty either.
 

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Vauxhall Astra Automatic

Hi I wondered if u can help me I stumbled across your pictures of gearbox overhauling as it was the closest thing I could find regarding my problem.
I have recently purchased a Vauxhall Astra 1.6l Automatic and in no time at all I have lost complete drive noforward,reverse anything,I only have a basic Knowledge of cars and I noticed 2 dipsticks, one of these is bone dry not the engine oil one,but the other,my question is is it automatic transmission fluid dipstick and if so how do I fill it,could this be the answer as to why I have no drive on the car.
 

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Probably, yes. It is filled through the dipstick. Check your handbook for how much should be in there. Once up to level you should get all your gears back. Check this regularly as it may be that you have a leak...
 

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Thanks for the Info on changing transmission oil

My 2003 Opel Omega B gear box got broke down due to low fliud in the system and I bought a new gear box and the vehicle is back on the road, I would like to know how often is the transmission oil to be changed and also I have been using Total Automatic transition fliud (ATX) is it also good for the vehicle as that is the best option in Ghana, Thanks
 
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