About an ls1 in a 1994 v6...
The carrier is what the ring gear (from a ring & pinion set) bolts to, and is what turns the axles.
Here is an Auburn style limited slip carrier sitting inside the axle housing with ring gear bolted to it:
I did a search for 1994 Camaro, Axle Assembly Rear (w/ Housing) in Kentucky and found a handfull of axles for $300 or less. Just make sure you specify limited slip and make sure you pull the cover off and verify it is a limited slip before you install it.
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One more thing is that you will more than likely get the rear disk brakes with the LT1 rearend which is good.
As far as a rear-end or rear axle, thats the same thing, just different terms. A "carrier" swap would convert the non-limited slip into a limited slip, providing you swapped in a limited slip carrier. I felt that entire axle replacement would be better for somebody who might not be able to swap out a carrier.
As far as NEEDING a new rear, absolutely not, you'll just be doing the "one wheel peel" until you upgrade.
Spool = both wheels spin 1:1 "very hard to handle on the street
Limited = each wheels spins at different speeds "but the wheel that has less traction spins faster...
so not all v6 have open diffs





