diff --git a/libs/chassis/_locales/chassis-jsdoc-strings.json b/libs/chassis/_locales/chassis-jsdoc-strings.json
index 95696473..c9a373d5 100644
--- a/libs/chassis/_locales/chassis-jsdoc-strings.json
+++ b/libs/chassis/_locales/chassis-jsdoc-strings.json
@@ -1,12 +1,9 @@
 {
   "chassis.Chassis": "A differential drive robot",
   "chassis.Chassis.drive": "Makes a differential drive robot move with a given speed (cm/s) and rotation rate (deg/s)\nusing a unicycle model.",
-  "chassis.Chassis.driveFor": "Makes a differential drive robot move with a given speed (cm/s) and rotation rate (deg/s)\nusing a unicycle model.",
-  "chassis.Chassis.driveFor|param|rotationSpeed": "rotation of the robot around the center point, eg: 30",
-  "chassis.Chassis.driveFor|param|speed": "speed of the center point between motors, eg: 10",
-  "chassis.Chassis.driveFor|param|value": "the amount of movement, eg: 2",
   "chassis.Chassis.drive|param|rotationSpeed": "rotation of the robot around the center point, eg: 30",
   "chassis.Chassis.drive|param|speed": "speed of the center point between motors, eg: 10",
+  "chassis.Chassis.drive|param|value": "the amount of movement, eg: 2",
   "chassis.Chassis.setMotors": "Sets the motors used by the chassis, default is B+C",
   "chassis.Chassis.setProperty": "Sets a property of the robot",
   "chassis.Chassis.setProperty|param|property": "the property to set",
diff --git a/libs/chassis/_locales/chassis-strings.json b/libs/chassis/_locales/chassis-strings.json
index 45b84814..3ca1aed1 100644
--- a/libs/chassis/_locales/chassis-strings.json
+++ b/libs/chassis/_locales/chassis-strings.json
@@ -1,7 +1,6 @@
 {
   "ChassisProperty.BaseLength|block": "base length (cm)",
   "ChassisProperty.WheelRadius|block": "wheel radius (cm)",
-  "chassis.Chassis.driveFor|block": "drive %chassis|at %speed|cm/s|turning %rotationSpeed|deg/s|for %value|%unit",
   "chassis.Chassis.drive|block": "drive %chassis|at %speed|cm/s|turning %rotationSpeed|deg/s",
   "chassis.Chassis.setMotors|block": "set %chassis|motors to %motors",
   "chassis.Chassis.setProperty|block": "set %chassis|%property|to %value",
diff --git a/libs/chassis/chassis.ts b/libs/chassis/chassis.ts
index 845cbb7c..03155949 100644
--- a/libs/chassis/chassis.ts
+++ b/libs/chassis/chassis.ts
@@ -24,19 +24,6 @@ namespace chassis {
             this.baseLength = 12;
         }
 
-        /**
-         * Makes a differential drive robot move with a given speed (cm/s) and rotation rate (deg/s)
-         * using a unicycle model.
-         * @param speed speed of the center point between motors, eg: 10
-         * @param rotationSpeed rotation of the robot around the center point, eg: 30
-         */
-        //% blockId=motorDrive block="drive %chassis|at %speed|cm/s|turning %rotationSpeed|deg/s"
-        //% inlineInputMode=inline
-        //% weight=99 blockGap=8
-        drive(speed: number, rotationSpeed: number) {
-            this.driveFor(speed, rotationSpeed, 0, MoveUnit.Degrees);
-        }
-
         /**
          * Makes a differential drive robot move with a given speed (cm/s) and rotation rate (deg/s)
          * using a unicycle model.
@@ -45,10 +32,10 @@ namespace chassis {
          * @param value the amount of movement, eg: 2
          * @param unit 
          */
-        //% blockId=motorDriveFor block="drive %chassis|at %speed|cm/s|turning %rotationSpeed|deg/s|for %value|%unit"
+        //% blockId=motorDrive block="drive %chassis|at %speed|cm/s|turning %rotationSpeed|deg/s"
         //% inlineInputMode=inline
         //% weight=95 blockGap=8
-        driveFor(speed: number, rotationSpeed: number, value: number, unit: MoveUnit) {
+        drive(speed: number, rotationSpeed: number, value: number = 0, unit: MoveUnit = MoveUnit.MilliSeconds) {
             // speed is expressed in %
             const R = this.wheelRadius; // cm
             const L = this.baseLength; // cm
@@ -65,7 +52,7 @@ namespace chassis {
             const sr = vr / maxw * 100; // % 
             const sl = vl / maxw * 100; // %
 
-            this.motors.tankFor(sr, sl, value, unit)
+            this.motors.tank(sr, sl, value, unit)
         }
 
         /**