THIS WAS MY FIRST TRUCK I STILL USED IT VERY SPECIAL NEVER LEFT ME ALLWAY RUN PERFECT I MAKE SURE OF IT ,IS AIR BRAKE AIR SUSP.FULL 26 "BOX 13" HIGHT WITH A SPECIAL SUSP. TO BRING IT DOWN TO GO THRU THE LINCOLN TUNNEL FOR EXAMPLE.AND DOCK IN THE CITY,ANY QUESTION PLZ TEXT ME LUIS.347 444 7002