Frequently Asked Questions
Transmission Lookup
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Tool, Sizing, For 34716-01, 4L80-E, GM

Tool, Sizing, For 34716-01, 4L80-E, GM Tool, Sizing, For 34716-01, 4L80-E, GM Tool, Sizing, For 34716-01, 4L80-E, GM |
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Part Number: TAT-34716-TL-SX
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The 4L80-E forward drum is often replaced due to wear of the sealing ring bore caused by
contact with the input shaft. Contact between shaft and drum occurs because of looseness/wear
of the support bushings and tight clearance between shaft and drum bore. Worn drums can be
salvaged by machining away the worn area, increasing the bore ID to .900 and installing the
Sonnax oversized outer diameter forward drum sealing rings 34716-01. The oversized seal
diameter restores proper sealing with the larger bore, while the increased clearance reduces future
wear by making clearance consistent with other applications, This fix works on all 4L80-E
forward drums.
Features & Benefits
Salvages all 4L80-E forward drums with grooves worn in the ID bore.
Reduces the likelihood of future contact between forward drum ID and input shaft.
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