How do I change the oil on the gearbox?

'Transmission Fluid' in a manual transmission vehicle is called 'gearbox oil'. On the gearbox, there is a drain plug in the bottom somewhere and a fill plug on the side. You drain, clean the drain plug, replace the copper washer and put the drain plug back in. Fill the gearbox with oil until the oil starts to weep out of the filling hole. Replace the fill plug.

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Manual gearboxes usually require a gearbox oil change every 30,000 to 50,000 mi (48,000 to 80,000 km). Automatic gearboxes usually have gear oil change intervals of between 60,000 to 100,000 mi (96,000 to 160,000 km). It's advisable that you change your gearbox oil filter at the same time as your oil.
Aug 23, 2019

When and how to check and change your gear oil and filter

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No but check with the dealer or your service/owner manual for the manufacturer recommended gearbox oil change periods.
There is no filter on the manual gearbox .
Whatever the manufacturer recommended period is for a gearbox oil change, change the gearbox oil twice as frequently as recommended to maintain it in good condition. If, for example, a change every 50000 miles is stipulated then do it every 25000 or so.

check the connection where the half axels go in to the transmission. the seal may need to be replaced. the half axels turn your front tires.

Be very carefull, if you pull the wheels hard enough the half shaft will pop the circlip on the inside of the gearbox and come away with the wheel, this will then require a gearbox strip down, leave it soaking in penetrating oil and try again.

when you pop the axel out of trans you could possibly lose a little fluid but not a whole lot you will lose less if the vehicle is only raised on the side you are removing i would also check the hub bearing

Some of your compression is getting past the piston rings and into the gearbox, this is commonly called "blow-by". The pressurized fuel/air mix then exits the gearbox via a crankcase breather tube that runs into the filter box for recycling back through the carbs. The only problem with this is that some of the blow-by mixes with the oil in the gearbox and that mix goes into the breather tube also. The result is oil in the air box AND diluted oil in the gearbox. The diluted oil can build up in the gearbox and actually raise the fluid level in the box. This makes the problem even worse. Do an oil change and maintain the proper oil level. The real fix is to have the cylinders bored then install first oversize pistons and rings and do a valve job while the head is already off. The "Real Fix" is expensive. On that basis, I would simply do more frequent oil changes and not worry about the air filter. Please rate my answer.

never done an american vehicle like this but on teh euroepon version which is a opel astra their is a spring clip inside the the shaft which is in the diff and what you do to get it out is two big screwdrivers either side and sheer brute force and ignorance and they pop out ,drain the gearbox oil first (manual gearbox) but a lot of autos are the same principle

i accidently drained some of the gearbox oil from my bravo b2600 1997. where is the hole to put more fluid back in there? how much should i put? and what fluid should i use?

YOU carnt have a transmission oil leak from the front axle on a Falcon as they are Rear wheel drive but could be the hose going to the radiator over the front end leaking But the rear end of G/Box should be only the OIL SEAL.