4×4 not working

ok i had the shop check my 2001 4×4 because the lights on switch blinking and they said encoder motor bad 600$ to fix so i found one and fixed myself and rest comp.. and lights work – encoder motor works – vac. lines work - every thing seems to work but front wheels are not pulling. i lifted front up and turned wheels by hand to see if in 4wh and they turned front axle,moved out of 4wh and wheels moved free. so if 4wh engages but doesnt work what is it, i called shop they said maybe front axle clutch sleeve . help please

2001 blazer

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