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Old December 25th, 2010, 12:11 PM   #1
kyl_maxwell
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Default 4x4 problems, and motor opinions

i got a 1990 k1500, the transfer case will come unlocked into 2x4 and all but the front end will not come unlocked. i have checked plugs and wires to the best of my ability and all seem fine, is their a switch or something in the axle that could have gone bad?
Also i am going to rebuild the motor, it is a 350 bored 30 over with over sized pistons in it right now but other then that is bone stock but i want to build it up, nothing to spectacular but a nice bullet proof, mild, torquey 355. any opinions, spec's or info would be greatly appreciated. its not a every day driver but it would be nice to still be able to take it down the road if wanted too.
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Old December 25th, 2010, 12:21 PM   #2
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there's two. one in the axle is just to tell you its in 4x4. the second triggers the heater in the front axle actuator to engage the shift fork. its in the shifter at the T case. if its out of wack it would make it hard to get in and out.
secondly the actuator go bad regular at the axle. the heating element gets to going bad, and the gas charge also gets bad. most likely the actuator.

I would first suggest to use a test light to see if your getting the on off signal to the actuator. if you have that then the actuator spins out of the housing with a pair of channel locks. if the rubber boot is extended while the power is off then its bad out right. it should only have about 3" showing at power off. about 4 1/2 -5 extended.

the only other issue could be the shift fork spring in the housing. its easy to change if the fork doesn't move back and forth with the push of a finger.
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Old December 25th, 2010, 12:22 PM   #3
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welcome by the way, and Merry Christmas
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Old December 25th, 2010, 12:28 PM   #4
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well the linkage is a lil off as in when is in 2x4 the lever says its in 4x4 but you just pull it past that and it shifts into 4x4 but never had a problem with it so never adjusted it right could that be part of the issue, and merry Christmas to you also!
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Old December 25th, 2010, 12:29 PM   #5
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well after reading the post again it would have something to do with it correct?
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Old December 25th, 2010, 12:40 PM   #6
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yes it could just be the gate adjustment on the switch. if I remember right that one has a 15mm headed bolt on the side of the T case and you have to loosen the center pivot on the shift handle. once you set the gate to correct spot tighten the 15mm bolt and then the center to hold it in place.
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Old December 25th, 2010, 01:31 PM   #7
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This is one style shifter. the other mounts to the tunnel and the link drops to the case. if you have the other style then pop the plastic cover on the interior side. the switch should be right there to adjust
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Old December 25th, 2010, 02:00 PM   #8
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thank you, just got the garage cleaned and got her parked in so will fart around on it tonight i will let ya know if i get anywhere
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Old December 27th, 2010, 04:28 PM   #9
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well it was the 4wd actuator...........thanks again guys
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Old December 27th, 2010, 04:58 PM   #10
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Glad to see you got it figured out.
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