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4L60, 4L60-E, 4L65-E, 4L70-E Input Housing Overrun Sleeve Kit Sonnax Part No. 77733-51KA The GM 4L60, 4L60-E, 4L65-E and 4L70-E input drum assembly is known to crack and strip out splines where the input shaft is pressed into it (where the overrun piston rides). Sonnax offers a hardened steel sleeve that reinforces the input drum to prevent this failure. Sonnax input housing overrun sleeve kit 77733-51KA includes a custom manufacured overrun piston designed for use only with a stamped ...

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