Yes it is but you will lose by the increase in gas mileage.
3.8
it will probably be 3.73
All you need to do is call a Chevy dealer and give them the VIN# and asked them what the gear ratio is in your truck and they will tell you what the factory gear ratio is.
I have a 2001 Chevy silverado with the 5.3 and im almost positive i have 3.42 gears
i believe it would be 3.11
The standard gear ratio on a 2000 Chevy Silverado extended cab 4x4 half ton truck is 3.73. This means that for 3.73 rotations of the shaft , the wheels turn one time.
from the factory the 5.3 liter Chevy has 330 horsepower at the crankshaft it has about 290 at the tires depending on gear ratio
they would be the same if both vehicles have same differentials . note that front and rear diffs on 4x4, must be matching ratio, to work properly when in 4x4
it will be the same as the rear diff
depends on the options chosen at purchase, call g.m with axle number
3:73 with 4:10 as option
Hear is an easy way to find out what your truck has in it FOR SURE. Wright the VIN # down and call a Chevy parts dealer and tell them that you have the VIN# and would like to know what the gear ratio is in your truck.