Originally Posted by MrBuick (Magnum)
2.73 and "lower" were a series III carrier.
2.56 and "Higher" was a Series II.
A series II carrier could be used with a series III gear set if you had a spacer ring. I don't know that they still make them or not.
Easier just to find a good used posi.
2.56 is Series II from an 8.5" axle.
2.93, 3.08, 3.23, 3.42, 3.73, 4.10, etc are all Series III from an 8.5".
2.73? No idea if it's Series II or Series III, but it's from a 7.625" axle.
Anything under 3.23 should not even be considered, and only if it originally came with 2.56 or 2.73.
If it originally came with 2.93 or 3.08, you WILL NOT notice 3.23, you might not really notice 3.42, and you might regret not going to 3.73 - even with all the cautions I insist on mentioning about HiWay MpG and the $400 it MIGHT cost to stop your driveshaft impersonating a guitar string.
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