The accompanying Interchange Chart, and Gear Ratio Chart, show the stock ratios available and possible swaps. The keys to interchange are driveshaft flange, axle spline (with outer wheel bearing diameter), and inner CV joint bolt pattern (for 86-92). For 79-85 entire axle assembly swaps, be sure not to mix drums, shoes, brake backing plates when mixing the 79-80 style with the 81-85 style, or backing plates when mixing 81-83 with 84-85.

79-85 (12A)Complete axle assemblyBrake line threads changed in ’81, shoes drums, and adjusters are much better 81-85. Driveshaft flange changed in ’83.
79-83 (12A) non LSDBare axle housingInterchangeable
84-84 (12A) non LSDBare axle housingInterchangeable
79-83Bare axleInterchangeable
81-83AllInterchangeable except must match w/LSD and driveshaft / flange (larger in ’83)
79-833rd MemberInterchangeable except must match driveshaft and flange (larger in ’83)
84-853rd MemberInterchangeable
86-92 All non-turbo3rd Member assemblyInterchangeable
86-92 Turbo into non-turbo3rd Member assemblyMust use custom driveshaft #2691-799R, and use Turbo halfshafts
89-92 4.3 viscous LSD into non-turbo3rd Member assemblyBolt-in, must use LSD stub axles
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