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Apparatus for use in determining the pinion angle of the differential or transmission of a motor vehicle includes an attachment which is detachably mountable to the input shaft or the output shaft. A camber gauge having longitudinal levels is detachably mounted to the attachment to measure the attit

Apparatus for use in determining the pinion angle of the differential or transmission of a motor vehicle includes an attachment which is detachably mountable to the input shaft or the output shaft. A camber gauge having longitudinal levels is detachably mounted to the attachment to measure the attitude of the differential or the transmission to which it is mounted.

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I claim: 1. Apparatus to determine pinion angle comprising an elongate gauge detachably mounted to extend from a rotatable shaft of a gear assembly of a drive train of a race car, the gauge having a longitudinal axis substantially coaxial with a longitudinal axis of the rotatable shaft, the gauge m

I claim: 1. Apparatus to determine pinion angle comprising an elongate gauge detachably mounted to extend from a rotatable shaft of a gear assembly of a drive train of a race car, the gauge having a longitudinal axis substantially coaxial with a longitudinal axis of the rotatable shaft, the gauge mounted to a plate, the plate substantially perpendicular to the longitudinal axis of and detachably mounted to the rotatable shaft, the gauge including a pair of elongate levels generally parallel to the axis of a gauge, the gauge including linear markings along each elongate level to indicate degrees of incline or decline, whereby the pinion angle of the gear assembly may be observed on the gauge. 2. The apparatus of claim 1 wherein the gauge has a transverse bubble level. 3. The apparatus of claim 1 wherein the gauge comprises a camber gauge. 4. Apparatus to determine pinion angle of a component of a drive train comprising an elongate gauge detachably mounted to either an output shaft of a transmission or an input shaft of a differential gear of a motor vehicle, the output shaft and the input shaft each having a longitudinal axis, the gauge having a longitudinal axis substantially coaxial with the longitudinal axis of the shaft to which the gauge is mounted, the gauge mounted to a plate, the plate substantially perpendicular to the longitudinal axis of and detachably mounted to the output shaft or the input shaft, the gauge including a pair of elongate levels generally parallel to the axis of the gauge, whereby the pinion angle of the shaft to which the gauge is mounted may be observed on the gauge. 5. The apparatus of claim 4 wherein the gauge includes a transverse bubble level. 6. The apparatus of claim 4 wherein the gauge comprises a camber gauge. 7. Apparatus to determine pinion angle of a shaft comprising a gauge detachably mounted to extend from an output shaft of a transmission of a motor vehicle, the gauge having a longitudinal axis substantially coaxial with the output shaft, the gauge mounted to a plate, the plate substantially perpendicular to a longitudinal axis of and detachably mounted to the output shaft, the gauge including at least one indicator responsive to the incline or decline from horizontal of the output shaft. 8. The apparatus of claim 7 wherein the gauge further comprises a pair of longitudinal elongate bubble levels and a transverse level. 9. Apparatus to determine pinion angle of a shaft comprising a gauge detachably mounted to extend from an input shaft of a differential gear of a motor vehicle, the gauge having a longitudinal axis substantially coaxial with the input shaft, the gauge mounted to a plate, the plate substantially perpendicular to a longitudinal axis of and detachably mounted to the input shaft, the gauge including at least one indicator responsive to the incline or decline from horizontal of the input shaft. 10. The apparatus of claim 9 wherein the gauge further comprises a pair of longitudinal elongate bubble levels and a transverse level. 11. A method to measure pinion angle of a drive train component comprising the steps of detachably mounting a gauge assembly to one of a transmission output shaft and a differential input shaft of a motor vehicle, the gauge assembly comprising an elongate camber gauge and a plate substantially perpendicular to a longitudinal axis of the elongate camber gauge, aligning the longitudinal axis of the camber gauge to be substantially coaxial with a longitudinal axis of the one of the transmission output shaft and the differential input shaft wherein the plate is detachably mounted to one of the transmission output shaft and the differential input shaft, adjusting the elongate camber gauge so that it is transversely aligned with horizontal, reading the pinion angle by observing bubble levels on the elongate camber gauge.