i think my rear main seal is gone on my car and i was jus wondring how hard it is to replace with the engine still in the car
i have the tranny comming out at the end of march and am thinking about doing it then but just tryin to geta n idea of what i am up against.

 

As long as the tranny is out it's a piece of cake. Pull off the flywheel. Then just pound a flathead screwdriver into one of the 3 marks, and pry it out. Then just pound the new one in.

 

you would have to remove the tranny but not the engine... but before you do that read this, this happens alot and people always think its the rear main seal :

Why has oil coated the underside of my engine and transmission?

It's most likely that the seal around your intake manifold is leaking. While it was originally thought to be the intake manifold gasket itself leaking, it's now found to be the sealant being used. The reason is a gasket is only applied to the left and right sides of the manifold while the front and back are sealed with RTV sealant. If the sealant is applied to a surface which isn't clean, the oil will be able seep through. This is why the oil leak is usually found at the rear of the engine (dripping down onto the tranny). It can be easily mistaken for a rear main seal leak. And since the RTV sealant is used on the front of the intake manifold, it's not uncommon to find it leaking there, too. A classic symptom of this intake leak is a rough cold idle. There is a Technical Service Bulletin (#476111) which calls for the replacement of intake gasket with a new and improved one, but that's to deal with a problem of the actual gasket (used on the left and right sides of the intake) laminate burning and causing a foul odor to enter the car through the ventilation system. If you have a 1994 F-Body, you might be able to get your oil leak fixed using this TSB (even though it's for a separate, but closely related problem). Otherwise, you'll have to have the dealer verify the leak which will likely be running black-light dye thorugh the engine. The revised gasket kit is part # 12524653.

Other, less common areas to check for leaks include the oil pan gasket, the oil dipstick tube seal (where it enters into the oil pan), and the timing chain cover seal.

 

ok i'll probably pull the intake and replace the gasket anyways even if it isn't the problem and i'll pull off the flywheel when the tranny is out to check that out .
Anything else it might be or to look for