No, not what is a transmission. lol

I just recently purchased a 1987 Corolla FX16. The engine is a 4A-GE (at least that is what it says on the side), it's a double overhead cam, 16 valve, 1.6L, fuel injected engine. The car front wheel drive and has an automatic transmission, which I think might be having issues.

When driving, the car produces a constant LOUD humming noise. I thought maybe it was wheel bearings, but the wheel bearings checked out. All the rotors and pads have been replaced, so it's not the brakes. I am afraid it might be the transmission, specially since the transmission does not shift very smooth, and will not shift into overdrive until hot. When I hammer the pedal on the freeway, the transmission slips a little before shifting down.

If someone knows what transmission is in this vehicle, as well as where I might be able to find a rebuilt tranny, that would be great. If a rebuilt EOM transmission is no longer available, can someone offer an suggestions?

If I am way off here thinking it's that transmission, that would be nice to know as well.

Thank You

So what? No one knows about this vehicle? No one knows what transmission it uses, knows what might be causing this noise?

Any help would be greatly appreciated.

Thanks

i believe it is a A-42DL. as far as noise no way to tell without actually driving or hearing it. but with it slipping I would have it checked before it leaves you on the side of the road.