Buick Pontiac Bonneville Lesabre 2004 Automatic Transmission 4-Speed 4T65E Remanufactured

Description

Smooth four-speed overdrive stepping and firm lockup return to your GM full-size sedan. This remanufactured 2004 GM 4T65E transaxle 10587T provides exact hydraulic calibration for 2004 Buick LeSabre and Pontiac Bonneville models. You must complete a high-temperature cooler line flush and execute a transmission adaptation reset before performing initial road tests to protect internal hydraulic circuits.

Shot-peened A380 die-cast aluminum forms both the main transmission housing and channel plate, verified crack-free through magnetic particle inspections. Steel planet pinions mesh with reaction sun gears to manage 3800 Series II torque without excessive lash. We install oversized actuator feed limit valves, Sonnax TCC regulator sleeves, Kolene steel plates, and high-energy Raybestos frictions. Renewed stator bushings restore internal fluid balance. The dry transmission weighs 205 lbs and ships inside a 36 by 26 by 22 inch crate.

Key Features of GM 4T65E

Independent repair shops buy GM 4T65E transmission units to restore positive forward engagement without paying high dealership parts pricing. This commercial remanufactured transmission assembly provides durable gear selection for Buick LeSabre transmission replacement projects.

• Oversized actuator feed limit valve sleeve stops hydraulic pressure loss inside the channel plate casting.
• Upgraded TCC regulator valve sleeve eliminates torque converter clutch slip and friction shudder.
• Hydro-tested valve body circuits hold twenty-two inches of mercury vacuum during decay leak checks.
• Balanced remanufactured torque converter eliminates driveline vibration and prevents front pump bushing wear.
• Raybestos friction clutch plates ensure solid torque transfer under continuous highway cruising conditions.
• Hardened fourth gear clutch shaft prevents spline strip failure under heavy highway throttle input.
• Precision stator support bushings maintain consistent hydraulic fluid feed to the converter clutch.

SuperFlow Dynamometer Diagnostic Telemetry Data

Technicians test each remanufactured 4T65E gearbox on an automated SuperFlow dynamometer through cold start and elevated operating temperatures. Gauges register main line pressure at 170 PSI in Drive and 230 PSI in Reverse at 1500 RPM. Pulse-width shift solenoids show actuation times under twenty-two milliseconds without mechanical bind. Re-machined valve body passages hold twenty-one inches of mercury vacuum under static bench tests. Dynamometer instrumentation logs zero torque converter clutch slip under loaded grade profiles. Fluid temperatures hold steady at 175 degrees Fahrenheit.

Field Installation Directives Application Limits

Push the torque converter inward while rotating the hub until you verify three distinct clicks. Make sure engine alignment dowels enter the bellhousing straight without draw bolt force. Do not buy this factory replacement unit for turbocharged track racers, drift cars, or nitrous builds.

• Flush chassis transmission oil cooler passages with heated solvent to remove trapped friction particles.
• Fill with approved Dexron VI fluid while monitoring fluid sump temperature using diagnostic tools.
• Reset transmission adaptation registers using an advanced scan tool before highway test driving.

Standard Warranty Delivery Crate Manifest

This remanufactured transmission includes a nationwide 3-Year/100,000-Mile warranty covering mechanical breakdown and hydraulic control failure. The reinforced wooden crate contains a balanced torque converter, technician installation checklist, dynamometer test pass report, cooler flush tracking card, and a pre-paid core return freight bill for prompt return transit.