Quote
I know that the front doesn't have one


The front diff very much has a drain plug. Look at the third-member mounting bolts... one of them should have a copper washer between it and the diff (as stated, about the 5 o'clock position). That is the drain plug. If stuff doesn't start flowing out right away, try taking a metal coat hanger/ice pick/piece of wire/etc and rooting around a bit.

Sean Strawmyer
Back and ready to rock...... crawl.

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