4wd problem

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hey there,i have a 98 rocky! i have had a new gear box and clutch fitted,since then the green light on dash for 4x4 system dont come on. and the front wheels dont turn when in 4h or 4l. you can ear it click when you engage 4l amd drives as if its in 4l. but the second you go on some slight tricky terrain only the rear wheels spin,its like the front wheels are just giving up! any help many thanks.

Not connected the vacuum

Not connected the vacuum pipes correctly, this means the vacuum plunger which engages 4WD isn't being activated and engaging 4WD.

it dont engage 4wd at all had

it dont engage 4wd at all had it up in air and nothing in 4wd/4l. can get it in 4wd but its permanent. but wont change between 2h and 4wd?