there is no oil pan gasket on this car. it sealed with a silicone type sealant. the trans. does not have to come out. the front exhaust pipe does though, as well as a bracket located on the front side of the engine, and the transmission lower cover plate. (thats probably why you thought the trans. had to come out). once those things are out of the way the bolts are easy to remove and the pan just needs to be pried off the bottom of the block and resealed with a suitable sealant. If you have a V6, you can easily remove the lower pan by removing the bolts and prying the pan off the aluminum case. reseal it in the same manner.
You need to check the transmission gasket between the transmission pan and the body. If it's leaking you have to replace it.
The housing needs to be removed. Check for scratches on the housing or engine. Make sure that all of the old gasket is removed before using gasket sealer to help seal the new gasket.
you do not need to change gaskets just a good flush will do the trick If the transmission pan has been removed, then you should replace the gasket. The only other reason for changing it is if it is leaking transmission oil from the gasket. Otherwise the above answer is good. Just watch out that whoever does it doesn't over tighten the plug. Toyota overtightened my wifes and trashed the threads. Had to replace the whole pan and Toyota wouldn't fess up to their mistake! There goes another couple hundred bucks!
NEVER flush a transmission with an internal replaceable filter. The pan should be dropped, the gasket removed and replaced and the filter carefully removed to replace (do NOT leave the filter neck seal in the valve body chamber when removing the original filter). You can flush the rest of the fluid with the new filter installed, but why?
The transmission pan has to be removed. There is no drain. lower one corner to let fluid drain into a pan. After the pan has been removed, take out the filter and replace. Reinstall the pan with a new gasket.
When you are facing your car radiator look under the car at the exhaust system. On the right side of the exhaust system you will see the transaxle fluid stainer. The transmission gasket is between the stainer and the transmission body. Carefully inspect your stainer if it's clean and doesn't have transmission fluid stains you don't need to worry about. If your gasket or stainer has wet region you have to replace the gasket. Be carefull working close to the exhaust system.
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It will be on the bottom of the transmission
you have put a new head gasket on it.
if it's the same as a 95 lt1 engine and you drained and dropped the pan and replaced the gasket and filter, then it is 4 and a half.