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2006 chevy trailblazer_ls
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Well since nobody helped me I checked and it seems that the drain plug should have a plastic seal.Mine must have been lost at the dealer more than likely.The bolt (drain plug) is fairly long and I dont know if that is the original either.I just wrapped the bolt with teflon tape and no leaks so far. :thumbsup:
the drain plugs on the front diffs are fairly long I'd say about and a half to 2 inches long and yes they should hav a similar plastic seal like the check/fill plug.
 
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