[JJR]

According to Hollander's you can use the following axle shafts:
BLAZER/JIMMY (full size) 77-80 4x4, front axle, GM

BLAZER/JIMMY (full size) 81-82 4x4, front axle

BLAZER/JIMMY (full size) 83-88 front axle

BLAZER/JIMMY (full size) 89 front axle, 28 spline

CHEVROLET PICKUP TRUCK 77-80 10 Series; 4x4, front axle, GM

CHEVROLET PICKUP TRUCK 77-80 20 Series; 4x4, front axle, GM

CHEVROLET PICKUP TRUCK 81-87 10 Series; 4x4, front axle

CHEVROLET PICKUP TRUCK 81-88 20 Series; 4x4, front axle

CHEVROLET PICKUP TRUCK 89 2500 Series; VIN model "V" (4x4), front axle, 28 spline

GMC PICKUP TRUCK 77-80 1500 Series; 4x4, front axle, GM

GMC PICKUP TRUCK 77-80 2500 Series; 4x4, front axle, GM

GMC PICKUP TRUCK 81-87 1500 Series; 4x4, front axle

GMC PICKUP TRUCK 81-87 2500 Series; 4x4, front axle

GMC PICKUP TRUCK 88 2500 Series; VIN model "V" (4x4), front axle

GMC PICKUP TRUCK 89 2500 Series; VIN model "V" (4x4), front axle, 28 spline

SUBURBAN 77-80 10 Series; 4x4, front axle, GM

SUBURBAN 77-80 1500 Series; 4x4, front axle, GM

SUBURBAN 77-80 20 Series; 4x4, front axle, GM

SUBURBAN 77-80 2500 Series; 4x4, front axle, GM

SUBURBAN 81-88 10 Series; 4x4, front axle

SUBURBAN 81-88 1500 Series; 4x4, front axle

SUBURBAN 81-88 20 Series; 4x4, front axle

SUBURBAN 81-88 2500 Series; 4x4, front axle

SUBURBAN 89 1500 Series; 4x4, front axle, 28 spline

SUBURBAN 89 2500 Series; 4x4, front axle, 28 spline

GM Part Numbers
458878 R., inner $115

458877 L., inner $155

15521884 R. or L., outer $110

28 spline inner axle.