they should be free, when in 4x4 they should be locked.
Should be
If it's a 4x4 with the 4.0L V6 engine, you should get 22mpg highway and 16mpg city. If it's a 4x4 with the 4.6L V8 engine, you should get 20mpg highway and 15mpg city. If you have a 2-wheel drive Explorer, it should improve fuel economy by about 1 mpg on both engines.
Go into a field or somewhere with stones turn you 4x4 on if it is in good condition not one of the four wheels should spin.
The 2001 Rubicon is FULL time 4x4 from factory. Unless you installed a 2x4/4x4 select then it should always be in 4wheel drive.
4x4 means 4-wheel drive.
The transmission should be in drive. The 4x4 shifter should be put in 4 high for highway use. If its push button 4x4 then use 4 high. 4 low is for pulling loads a real short distance only.
In my experience Chevrolet 1500 4x4 dosent have a front wheel drive option. You should be able to drive in 2wd, 4wd high and 4wd low but no FWD.
unless it is the 4x4 version it is a front wheel drive. the 4x4 version is a front wheel drive until the 4x4 is engaged.
4x4 means 4-wheel drive.
1999 - 3.0 L flex fuel Ranger : 2 wheel drive - 5 speed manual - 16 city / 21 highway 2 wheel drive - 4 speed automatic - 15 city / 20 highway 4X4 - 5 speed manual - 16 city / 20 highway 4X4 - 4 speed automatic - 14 city / 18 highway According to www.fueleconomy.gov (Helpfull)
When purchasing a used 4x4 be sure to have a mechanic check the vehicle over for any problems. 4x4 can have shifting problems or the 4 wheel drive could be completely blown.