4x4 open diff acting like a locker

[92Raiderburban]

accidently left the 4x4 activated and drove for a bout 5 miles on the road. Turning felt like the brakes were half way down and the rear tires chirping as if it had a posi unit that wouldnt unlock. Glove box shows no G80 code. Or did i miss something???? Is there possibly a unit (that previous owner installed) that "locks up" when the 4 hi switch is on?

 

[df2x4]

What you're describing sounds like normal operation of the 4WD system. You're always going to have some resistance when turning on dry pavement with 4WD engaged.

 

[454cid]

The driveline is fighting itself front to back, not side to side. You shouldn't be on dry pavement with 4wd engaged.

 

[RichLo]

Yep, and the problems you described gets worse fast if the tires aren't the same or are wearing unevenly.