The GM shop manual won't have anything in it (except dust) you can't find at alldatadiy, but the same can't be said about the reverse. Try using the search feature. Some things are located categorically and not so easy to find. Terminology can be an issue as well.Originally Posted by danbenili
If you already have alldata, there's no advantage to having a manual, unless you just want a bound copy. Also, if you get one off Ebay, it may not be current, and lack updated bulletins and part numbers.