1900 is too low a RPM to hold it in OD. Your options are to run a smaller tire or re-gear. Or just flick the OD switch on the dash.
With 33's your best gear is 4.88, even though you probably don't want to hear it. The 42RLE has a .69 OD.
You could go 4.56, but 4.88 would be the best choice. IMO.