Rear main seal

SOURCE: 1994 Mitsu,Galant, 4cyl.Automatic. Hello and

Hi steve
Yes you have to pull out the trans,take the flex plate off and the rear main seal is there,be very carefull when getting it out not to damage where the seal runs or where it seals on the outside,little tip put some grease around outside and inside of seal when putting in it will slide in easier and make sure its even all the way around when its sitting in and you wont have a drama.
I hope this helps good luck.

SOURCE: oil gushing from trans.??????? changed valve

If it in fact it is the main seal you should see tranny fluid leak at the point where the engine bolts to the transmission. With car in park and brake on, start engine and carefully look under to see where the fluid is coming from. If you see no fluid leakage, place the front end (this assumes front wheel drive only) on jacks stands and block the back wheels. Have a friend start the car and with their foot on the brake place the car in drive and SLOWLY remove their foot from the brake and allow the front tires to spin (DO NOT REV ENGINE) watch for leakage as wheels turn. If you see leakage at the engine/tranny mating surfaces then yes I expect it would be your main seal. I'd take avery good look at tranny cooling lines to and from the radiator, if these leak it is very heavy.

I hope this may have assited you,
Tom