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Having problems with my 2000 civic si. the driver side cv joint went out. replaced it with a new one. the new joint came apart twice. the mechanic said that is due to the tranny not being the stock transmission or a honda civic transmission. he's not sure what kind to transmission it is. ideas? answers.

 
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.....Did someone do an engine swap?

 
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see i don't know. i'm the third owner of the car are there's a lot done to it. the craigslist ad when i bought said honda civic ex/si. which i was thinking he could of dropped a si engine in there. or it's stock and put some off the wall tranny in there.