How much tranny fluid do I put in after draining it?

12.9 Quarts of most transmission oil

There is no drain you just take the bottom pan off and then let the fluid drain into a pan.

GET NEW GASKET AND FILTER FOR TRANNY ALONG WITH THE FLUID (BEFORE YOU BEGINE)
GET A LARGE FLAT DRAIN PAN.
PUT CAR UP ON 4 JACK STANDS.
place drain pan under tranny pan.
undo tranny pan screws - allow one corner to hang lower than the other corner (to allow fluid to drain) slowly remove them all.
Its messy! empty tranny pan into drain pan. set tranny pan to the side. undo the filter clamp, carefully remove the filter - set into the drain pan, remove the gasket around the tranny body/tranny pan.
Clean tranny block surface with clean cloth. install new filter, install clamp tightly. Clean tranny pan, place gasket onto pan and then reinstall tranny pan. (this only change the fluid in the tranny body and pan) If you wan the fluid out of the torque convertor you have pull the pan under the torque convertor and turn the convertor so you can get at the drain plug. Allow fluid to drain into drain pan. Reinstall drain plug and pan. (you will need a lot of fluid) Check manual for qty. Place car back on to ground/floor. Refill tranny through filler tube. Do not start the engine until oil is at full mark, and when you do start it do not all it to run for than 4 minutes - stop and add more fluid and check full mark again (repeat until no longer sinks below full mark. gently test drive around you block -- come back and check level while engine running. Top up if needed.
Siphon out excess above full mark. Test drive around 3 block,
come back check full mark. Because the torque convertor was emptied it can take a while to get all the air out it.

Tranny fluid funnel in the tranny dip stick tube.

The most common whining noise from that tranny is the transmission pump. Sometimes they have a high pitch whine noise yet nothing wrong its normal. Sometimes its an indication of the pump being over-worked due to a dirty filter or fluid low. Turn engine on and check tranny fluid level. If low add to cold mark on dipstick, check for leaks under vehicle. If fluid appears very black or burnt smell, recommend flushing fluid and replacing filter (located inside tranny pan) yours will be a 4L60E type tranny.

You would need to find something that is the same as sychromesh fluid that GM uses.

first you need to buy transmission fluid new filter and new gasket.you need 11.4 pints of transmision fluid.raise front of vechicle.set parking brake.block both back wheels.besure support vechicle weight with jack stands. get a drain pan.if your transmission pan dont have a drain plug.loosen rear pan bolts a few turns.remove the front and side transmission pan bolts. let fluid drain.remove tranny pan. then clean old gasket material from transmission and pan carefully.dont scratch or damage surface.clean old tranny bolts using brake cleaner or buy new tranny bolts.you have to put a tiny film of rtv silicone on tranny bolts so they wont leak.carefully remove old tranny filter and put on new filter.clean all grease grim away from tranny pan it should be **** and span because.you might need a little gasket adhesive to hold gasket in place while putting pan back on transmission.to line up bolt holes.loosely put all bolts in you have to move pan a little to get holes line up.when all is finish put tranny fluid back in.besure you put 11.4 pints back in that about 6.5 quarts. make sure tranny fluid level is right before driving vechicle.l

Improper fluids in a automatic transmission can cause severe results.
Drain the transmission fluid and change the filter.
If the car was running at the time you put engine oil in the transmission, I would also flush or drain the torque converter.
Replace with the proper amount and type of fluid.

There should be a fill cap locate drivers side down on top the drive axle. Check your book or call auto parts store for capicity

there is no dipstick, this is a sealed transmission, GM did this to stop owners from overfilling the trans, the fluid level must be checked by the dealer with a scan tool.