If you want to go deeper, there are two styles of cast rearends. There is the red cast and there is the black cast. The Red cast had course splined axles while the black cast has fine splined axles. Even though it has fine splined axles, the carrier isn't as strong as the one found in the aluminum rears.
AJ
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1980 [COLOR="Red"][/COLOR]482- Stock
1981 [COLOR="Red"][/COLOR]582- Mag18, Sleeve Hitch, Spring assist
1979 [COLOR="Red"][/COLOR]682- Mag18, Sleeve Hitch, Spring Assist, #1 Tiller
1980 [COLOR="Red"][/COLOR]782- Mag18, Sleeve Hitch
1983 [COLOR="Red"][/COLOR]982- Stock, Fully Optioned
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