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Back-shifts to 2nd and 1st at any RPM
Chevy GMC Duramax Diesel Applications
Brand: Allison
Piston housing
Components
Sonnax 72854-03K 4T80E transmission TCC regulator Valve kit Featured Products Back-shifts to 2nd and 1stCountry Region of Manufacture: United States OE Spec or Performance Custom: OE Spec Manufacturer Part Number: 72854 03K Brand: Sonnax Manufacturer Warranty: Yes 4T80 E TCC Regulator Valve Kit Part No. 72854 03K In GM 4T80 E units, continuous oscillation of the converter regulator valve in the cast aluminum bore causes bore wear which allows apply oil to leak to exhaust. Another area of concern is the valve bore end plug. The continuous movement of the
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