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I don't think I'd know one if it bit me. What to look for? What would fit an '86 Trooper?
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you should be looking for the factory code G80 on the firewall and also mine has a sticker on the rear diff saying to only use lsd oil. as far as no stickers telling one 3rd from another im not sure there is a way aside from pulling it apart.
 

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The only lsd that will fit your '86 10-bolt is from a late '80's turbo Impulse, you'll have to have the lsd carrier swapped to your housing/ring gear for the right ratio.
You could swap in a later axle assembly that was available with lsd but it would be 4" wider than your current axle.
 
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