Thread: LS1/4L60E/C4 Differential Alignment?

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You want the centerline axis of the rear-end input shaft to be parallel to the centerline axis of the transmission output shaft. The transmission doesn't need to point directly at the rear end input shaft.

By placing the centerlines of the rear-end and the transmission parallel to each other, the front u-joint will have the same angle as the rear u-joint. This will provide the least amount of torsional vibration in the drivetrain, and the quietest ride.

Originally Posted by Hot Rod Roy

You want the centerline axis of the rear-end input shaft to be parallel to the centerline axis of the transmission output shaft. The transmission doesn't need to point directly at the rear end input shaft.

By placing the centerlines of the rear-end and the transmission parallel to each other, the front u-joint will have the same angle as the rear u-joint. This will provide the least amount of torsional vibration in the drivetrain, and the quietest ride.

Thanks. I understand cancelling out the angle from one end to the other...no problem there. I'm wondering, and it'll probably sound foolish, will it make any difference if I am angled up (plan on keeping motor low and rear high) versus the normal angling down. I dont figure it makes any difference but I wanted to be sure before committing to something. Also, I would assume that the same would apply on the propeller shafts on the IRS. They may be angled up from the differential to the hubs. Man....I'm sweating this thing. I don't want to lose floor space and I have plenty of room to drop the motor even more. LOL's.

Dave