Accidentally left the 4X4 on.

I wouldn't worry about it. Driving on the highway is less likely to cause driveline windup then running around the city. You can check your t/case fluid and see if it's still a nice bright blue color (if you have the auto4hi button on the dash).

Ian

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Thank you for that quick response. I'll check it out.

I would not worry too much but I disagree that highway driving is "safer" because the transfer case will heat up more in 4wd on hiway than around town stop and go and will have a more constant torque wrapup load on it too.

I'm not surprised, as you probably have little idea how the automatic transfer cases work.

Ian

hiway

No, I do and it does not have a differentail in it like a true full time case like the old 203 or my BorgWarner Quadratrac in my 79 J20 which can run for ever in 4wd at high speed with no problems because there is no driveline torque buildup. You do not run a conventail Tcase automatic or not in 4wd on hard pavement plain and simple as the "auto" 4wd in question is not that smart.

Different transfer case, it's designed to be run that way.

Brian

Oh, just a courious question, my friend has one and he drives it 100 miles at a time on dry pavement and it hasnt messed anything up yet, personally I dont see how he affords to having the 1 ton chevy with a 350 4 barrel

You mean 73 to 79 with NP203?s that had a center differentail and were either in unlocked 4WD (Tcase differentail active) or locked (diff locked out) with no 2WD selection from factory. They were never rated to run the "locked" mode on hard pavement.