Can i spray some kinda seal leak spray where my oil leak is

SOURCE: 97 Land Cruiser Oil Leak,Rear Seal?

sounds like your lower gasket is shot, and while under pressure its slowly leaking through a cracked gasket try getting gasket sealent and put on seal crack let it sit for a day or 2 it should obsorb in and fix the gasket that should probably do the trick

SOURCE: 1991 chevy silverado 1500 2-wd leaking oil seals, rear end.

the outer bearings can be driven in using a suitable Very Large socket. Removing the old ones either requires a puller or a cutting torch. I use either depending on the state of the bearings.
when driving new ones in, make sure

1. your socket wont jam in with the bearing
2. you only hit against the outer bearing shell
3. you keep it very straight
4. hit it til you hear a resounding solid clunk as the bearing reaches full insertion.
5. you fit a new oil seal
6. use a block of wood across the oil seal face to protect it as you knock it in - keep it straight!

SOURCE: rear main seal leaks..does this affect transmission??

A leaking rear main seal will not cause your transmission to leak.

The transmission has its own seal and should not leak because of the engine rear main seal.

Due to the labor involved in replacing the rear main seal on the engine, it is best if you replace the front transmission seal at the same time if possible.

Installation varies on different vehicles but the principles are the same.

SOURCE: rear axle oil seal location for chevy 3500 dually

Here is a picture step by step guide from autozone:

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Rear+Axle&partName=Drive+Train&pageId=0900c1528008f4d4&subChapterTitle=Axle+Shaft%2C+Bearing%2C+And+Seal&partId=0900c1528008f406

SOURCE: 1993 Dodge Stealth Oil leak 3.0 SOHC

there are seals behind the timing cover.when they leak oil drips down and out.my 93 base model leaks oil and coolant from this same place.