Well I know I have replied to this before but now I think I have problems. Just now heading home I started the truck and it showed it was in 4 low, I pushed the 2wd button and all it did was flash. I back out of my grandparents driveway to tow my bro home and the front diff was not ingauged (turned without the drag). While towing him home it was still in 4low and I was rolling at about 18 mph and it started jumping and trying to die in the throttle but when I let off it went back to smooth idle. I made it home, only 3 blocks, and turned the truck off, went inside for 5 min and got back in it. When I started it, it was now in 2wd and everything was fine. My service 4X4 light has been coming on and off a lot lately but like you all said it might just be the switch so I have been ignoring it. Does anyone have any idea what kind of trouble I am in now??? Thanks, Ryan

https://www.performancetrucks.net/fo...ht=service+4X4

 

well it definently sounds liek the switch or maybe the front actuator, but also check your ground wires, bad grounds can do some serious screwy things to a truck

 

I have removed the grounds on the driver side frame and cleaned it off and reinstalled but that was a while back.

 

It has been 4 days, cold and warm, and it has not done anything wierd. Everything seems to be working fine. I don't know what to do, I give up.

 

Anyone you know have a scan tool? I know if I go in to my local chev dealer they will scan my truck for free, just ask the service manager