I had a leakage on my Auto gearbox sump or reservoir and the transmission oil dropped that much that i noticed my gear skipping while moving. I quickly toke it to technicain to fix it. After sealing the leaking point and he added some oil to it. While testing it, it started failing to change the gears automatically, Keep going to neutral while the dashboard gear indicator goes red. He said the firebody is faulty, please can u help me here. It moves but it goes neutral whenever it speeds to auto change to another gear.
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if its the zf auto box drain the fluid from the plug in the sump pan when empty refit plug remove level plug from rh side of gearbox. 8mm allen screw, yust above exhaust, refill with correct fluid through that hole,run engine get transmission oil temperature to between 50 - 70 degees C you need temp probe to do that or jag diagnostic gear or you can guess by feeling transmission sump pan. work the gearshift through all gears. then remove level plug allow to drain if level to high or top up if low, make sur you use the correct fluid, hope this helps
I take it you are talking auto transmission. Un do the drain plug in the box sump or if you do not have one remove the sump. replace filter in the sump . replace the sump with a new gasket and refill the sump. IF there is nothing wrong with the transmission and you only want to change the oil the best practice is to take it to a auto transmission shop where they can change the oil with the engine running and this changes the oil in the torque converter as well giving you a complete oil change. IT is more expensive as more oil is used but it changes all the oil and not just a part of the system. If your are talking manual, then remove the drain plug in the bottom of the gear box and when all the oil is out replace the plug tightly and remove the filler plug in the side of the box. Add oil until it runs out of the filler hole and when it stops replace the filler plug tightly. Use the correct grade of oils in both cases.
If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:
The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):
In the picture above the transmission oil pan was removed for oil filter replacement.
This is the sort of fault that is very difficult to diagnose from a post on here without my dirty hands under the bonnet ,but from the sound of it either you have the wrong oil in the auto gearbox like its been filld with manual gearbox oil or the brake bands and clutch are worn and the particles are in sump going around with the oil clogging up the gauze filter inside the box so drain the oil out and drop the sump of the gearbox then clean the filter and refill with new oil ATF type transmission oil and see what happens ,if it works of sorts but still playing up then trade car in quick
has your transmission had a service if not have a service change oil and filter.filter is inside sump pan change seals and sump pan gasket replace with oil this gearbox needs atention just like your engine and needs regular serving.
if it is hard to shift when the vehicle is cold chances are that the oil in the gear box is too thick take it to a shop and try using a thinner oil than what is in the gear box and this will eradicae your problem
depending on the year of the vehicle most manufactures not all have a specific type of fluid for the transmission. newer ones( what year is the vehicle?) this could be a sitcking valve in the valve body or a broken 2-3 valve spring in the valve body of your transmission, or a broken servo spring.