97 yukon 4x4 problems

[AlanHurd54]

i have a 97 yukon the 4wd seems to be messed up if i hit the button engine off key on i can hear the accutor in the cab click and i can hear it shift under the truck but still no 4wd and the light on the dash just blinks also if i hit the button more than one there is a loud clunk looking for some insite to get this fixed already started snowing here in maine

---------- Post added at 11:30 AM ---------- Previous post was at 11:29 AM ----------

oh i also wanted to say after it clunks i have to hit the 2wd button like 5 times till it clunks again or i cant drive i get nothing out of the tranny

 

[SunlitComet]

Which 4wd button are you pressing when this happens.

---------- Post added at 02:14 PM ---------- Previous post was at 02:13 PM ----------

Also does it try to stay in 4wd all the time?

 

[AlanHurd54]

it clunks like that when i press any button the 4wd switch wasnt working at all till i found a blow fuse for the transfer case i just bought the yukon also i have noticed since that when driving down the road the 4 lo light blinks while i drive even though its in 2 wd

---------- Post added at 10:59 AM ---------- Previous post was at 10:03 AM ----------

I'm thinking i may have to get new acuators on the front axle and the transfer case

 

[SunlitComet]

Which fuse number and description and amp rating please?

 

[AlanHurd54]

fuse position 2 and i believe it was 20 amp

 

[SunlitComet]

Power from that fuses goes to control mudule for switching and then to the motor. Based on your description it sound like the shifting motor assembly is jamming. Remove it and test while removed to see if you have similar jamming on the motor or it moves freely. If it works fine then the problem is internal to the t-case.

 

[AlanHurd54]

Ill check that out thank you

 

[LI99HOE]

I had a similar issue when I first bought my truck...minus the blown fuse. I opened the switch, and found bad solder connections inside on the board. It used to say I was in either 4hi, or 4lo when it was in 2hi. Resoldered the connections, re-installed it.... job done.

 

[SPLmonster13]

Have you actually checked the actuator? Mine had I similair problem I could hear it and everything. Pulled the actuator out and it was bad. Besides it's easy to check.

 

[AlanHurd54]

ok so i changed the 4wd actuator on the front axle i also changed the transfer case motor now when i try shift into 4hi nothing and when i shift into 4lo i can feel it shift but when i put it in drive nothing its like the truck is in neutral