Either drop the tranny or pull the engine.
how do you change a rear main seal in a Chevy 350 motor
How do you change a rear main seal on a 2001 Chevy 2500 HD long bed
no ,the 1986 and up blocks have a one piece rear main seal and will not fit in the earlier blocks.gmjim
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When Chevrolet introduced the Chevy Nova in South America, it was advertised as - of course - the Chevy Nova. However, in Spanish - the main language in South America - the word Nova is the equivalent of doesn't go. Bad Advertising!This answer is totally wrong. It never happened. See:http://www.snopes.com/business/misxlate/nova.aspLet's try to do better than repeating erroneous information. I know it hard; even some textbooks repeat the piece of folklore.
you have to pull the transmission out-- or the enging which either is easier
Between 350 to 400.00 dollars depending on who does it.
The engine rear main seal can only be replaced with the engine or transmission out of the vehicle.
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You MUST remove the oil pan to change the rear main seal. It's the only way because it is a 2 piece seal that fits in the rear main cap and block.