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What will happen if the transmission is overfilled with oil?

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Transmissions that are overfull can "whip" the fluid, buy catching the fluid on the rotating parts. This is bad for a number of reasons,, It causes air to be trapped in the fluid (foam) causing a loss of the ability to transmit pressure to the apply devices, they hold the clutch packs and bands, and move pressure control valves, causing a slipping condition. this in turn causes damage to componets and a great deal of heat, also very bad for the transmission.

Posted on Jul 08, 2014

  • Debbie Bannick Jul 11, 2014

    Thank you solo much!

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1 Answer

Can a transmission malfunction if overfilled with transmission fluid?


How Does Overfilling Cause Problems? If you overfill the transmission, you will find that the fluid may foam, and that can lead to erratic gear shifting. Other problems can include transmission damage and oil starvation.

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Trans fluid goes in the same tube the transmission dipstick sticks into. You'll need a funnel with a narrow bottom opening (1/2" or less). Make sure you pour it in the transmission dipstick tube, and not the engine oil dipstick tube. ;)
Initially, try to add about 3/4 of the estimated amount that you accidentally drained, then slow fill the remainder while checking level at different stages.
Also, try not to overfill. Check fluid level often, with engine running, in park or neutral, as you re-fill it.

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1 Answer

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How to change transmission filter in a 1994 Volvo 940 turbo


1) Work safely: work on this only when the transmission is cold. Hot transmission oil will burn you. Note - the transmission filter is actually a metal screen. If you search on AW71 filter and look at the images you can get a better sense of what you are working on if you haven't done one.
2) Drain the oil via the drain plug. The recommendation is that at the same time of changing the filter, the transmission should be pressure-flushed, removing suspended particles in the oil itself.
3) Remove the transmission oil pan. Be prepared for some oil spillage from the valve body.
4) Remove the screen, observing scrupulous cleanliness when working inside this area. Note how it is installed very carefully.
5) Attached to the transmission are magnets, designed to trap metallic shaving before they can damage the transmission. Clean these thoroughly.
6) Clean the transmission oil pan thoroughly and allow it to dry completely.
7) Using a new filter, install it correctly into its location.
8) Using a new transmission oil pan gasket, install the pan and tighten to the specified torque in a criss-cross pattern. Do this slowly and incrementally; it is possible to warp the pan on installation.
9) Top up the oil level if much was lost - observe proper top-up procedures and never overfill the transmission. Check for leaks from the drain plug and oil pan gasket. If you overfill, transmission fluid will be ejected from the fill tube and there is a risk of damaging the unit.
10) Road test the vehicle.
11) Check the oil level once again, ensuring that it is neither underfilled nor overfilled.

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1 Answer

Where do i put the gearbox oil on the chev lumina ss 2008


If it's a manual transmission then there should be a check plug on the side of the transmission. It should have a 4 sided plug you can remove with eather a 15 or 16 mm open-end wrench or an adjustable (crescent) wrench. Don't overfill, but keep it within 1 inch of the bottom of the check plug hole. Carefully use an allen wrench to check. If the vehicle has an automatic transmission and it has a transmission dipstick, then you can fill it through the dipstick tube but again do not overfill. Drive after filling and with the oil warm ensure the oil level is within the warm/hot cross hatches on the dipstick. Do not overfill. If there is no transmission dipstick on the automatic, then take it to your dealership to fill.

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1 Answer

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You are right. The indicator is quite useless. You wont overfill because it will just pour out if you get too far. Use a flash light and good judgement and you will be fine. Make sure you are using Dexron/Mercon automatic transmission fluid. Yes, for the manual transmission.Let me know if you need anything else.

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1 Answer

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No, absolutely not. Check the transmission fluid level with the transmission dip stick. The oil level dip stick may not be the same length and the markings are not the same. Overfilling a transmission may cause damage. Do not have one then you need to get one. What has happened have you lost it?

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1 Answer

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