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I have a 90 b2 and all the fuses are good in cluding the ones under the hood. i heard that there is an aftermarket manual kit that can be installed. Anyone heard of this or know where to find it? would rather have a manual shift if i can.
I dont know of any kits for your t-case ,but you can swap it for a manual shift t-case.
As for you problem it sounds like you elec. motor on the t-case is bad.Crawl under the truck ,find the back side of the t-case there should be a small elec. motor on the t-case Tape it ((((LIGHTLY ))))with a hammer and see if the 4x4 works.You might have to take it off and clean it. Good Luck!!
I would agree with grayranger....sounds like the motor on the transfer case. When you hit your 4x4 button, do you here a solenoid clicking? Do the lights come on?