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All 3rd members front and rear (79-85) and rear (86-95) are interchangeable. You must be remembering wrong... 
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I think he's thinking of the factory 4:87 carriers that can't be re-geared...
well maybe just me, toy motors will handle 4 grand all day in and out.
I would just go with the locker and 5.29 gears. you will go with bigger tires later, you will make it your wheeler not dd later. so go with what you will be using rather then doing it all again later down the road.
wheeling is an addiction. you always want more.
do it now and do it once.
Sorry if there is any confusion this was an old thread that I wanted rant my aggression on the difference between the 84 3rd and 89 3rd member. I am ditching the 31's now for 35's.
Go all the way. Only do it once.
84 had what's known as the "4 cylinder" gears in it, after 86 (I think) all diffs 4 cylinder and 6 cylinder used the same "V6" gear sets. That is probably what's causing the issues...