the carrier is what the ring gear is bolted to(also houses the spider gears). The 3.08 is on a 3 series carrier, & the 3.73 & lower are on a 4 series carrier. I agree with MikeP, it would be much cheaper to swap complete rear diffs with someone, rather than set up gears & replace the carrier. Good luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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