my book shows 5 possible rear axles in that time frame for 3/4 ton Dodge trucks. Chy8.25, 9.25, D60, D70U, and D80. Most likely would be a D60. Go here and you can see the diff covers and more info to ID the axle:
Front would be a standard rotation D44 or D60 w/vacuum disconnect.
Buy with confidence from the #1 Authorized Dealer of Yukon Gear and Axle Off Road Products
the ONLY Yukon Dealer to offer a COMPLETE Lifetime Warranty on ALL Yukon ring and pinion sets*
Use code "GL4X4" at checkout for 5% off SSC branded products at CompleteOffroad.com
Yukon, USA Standard, ARB, RCV, Warn, Currie, Bubba Rope, Master Pull, Trail Defense, and more
Authorized Yukon Dealer since 1998
Like us on Facebook!
*Yukon ring and pinion sets must be purchased at full retail price to be eligible for warranty