Originally Posted by zildjian4life218
Why did gm switch to the 360 degree one piece rear main seal in 87 then? Maybe I should have said "leak prone."
They actually switched due to government regulations on the "carbon footprint" of a car. Feds were looking at fluid drips x "xxx" million vehicles and the impact it has on the enviroment. This combined with the manufacturers push to offer longer warrantees were the reasons bottom end (and entire engine)sealing was revamped.