6T40 2015-2016 Buick LaCrosse, Regal 2.4L FWD – Remanufactured 6-Speed Automatic Trans

Description

Holding 172 lb-ft of engine torque through a 4.58:1 first gear step during continuous corporate shuttle runs, this transaxle sustains 220 PSI line pressure. Commercial transport fleets preserve their vehicle operational reliability by purchasing a Buick 6T40 Remanufactured Transmission engineered for 2015 to 2016 Buick LaCrosse and Regal 2.4L FWD sedans.

Rigid cast aluminum housing structures prevent internal shaft distortion under sustained maximum gross passenger transport loads. Vacuum-checked valve bodies receive hard-anodized Sonnax sleeves that stop hydraulic fluid cross-leaks across critical shift channels. Carbon-phenolic clutch plates feature radial cooling grooves that evacuate hot ATF away from steel drive plates. Sump fluid capacity demands 8.5 quarts of DEXRON-VI, unit dry mass measures 175 lbs, and dual 3/8-inch quick-connect fittings manage cooler routing.

Key Features of Buick 6T40

Slipping forward clutch packs during highway merge acceleration prompt commercial fleet owners to buy Buick 6T40 remanufactured transmission hardware. Remanufactured hydraulic circuits with micro-polished valve tracks ensure instant clutch lockup and eliminate gear hunting under load.

• Forged alloy steel planetary gear systems resist tooth deformation under sustained maximum torque output.
• A deep 4.58:1 first gear step enables smooth grade ascents while carrying heavy passenger loads.
• Wear-resistant Sonnax valve bore sleeves maintain stable line pressure across all operating temperatures.
• Toughened 6T40 commercial transaxle systems deliver verified torque capacity for daily passenger transport.
• Billet accumulator pistons eliminate pressure leaks during fast highway passing downshift maneuvers.
• Direct internal fluid circuits deliver constant lubrication straight to high-speed differential carrier bearings.
• Precision-ground output shaft splines eliminate driveline backlash under sudden acceleration cycles.

Pressure Thresholds Reduction Gear Architecture

Operating line pressures cycle between 160 and 220 PSI to provide positive clutch lockup under gross vehicle loads. Fluid pan temperatures stay within 160°F to 190°F during sustained high-load highway cruising. Gasoline four-cylinder output sustains 172 lb-ft of continuous torque at 4900 RPM without internal component slip. External transmission coolers radiate up to 750 BTU per minute to protect vital internal components. Gear reduction steps include 4.58:1 first, 2.96:1 second, 1.91:1 third, 1.45:1 fourth, 1.00:1 fifth, down to 0.75:1 sixth.

Front Driveline Output Spline Alignment

Coupling straight to the front CV axle drive joint, the hardened transaxle output hub delivers continuous rotational force. Total indicator runout along the output journal measures under 0.0020 inches total indicator reading. A ductile iron parking pawl unit holds up to 950 lb-ft of static driveline load on inclined commercial driveways.

Control Calibration Routine Maintenance Protocol

Reset electronic transmission adaptation values using a diagnostic computer before releasing vehicles for commercial transit. This transmission is not engineered for track drag racing, extreme rock crawling, or gross combined vehicle weights exceeding factory chassis tow limits. Each shift scan transmission sensor data for stable line pressure regulation. Every 30 days inspect cooler lines and electrical connectors for leaks or contamination. At 30,000 miles drain the pan to replace the transmission fluid and internal filter.

Warranty Scope Crate Manifest Details

Operating peace of mind comes standard with a 3-Year / 100,000-Mile commercial fleet warranty covering remanufactured mechanical parts. The banded wooden crate carries the remanufactured transaxle, a balanced torque converter, cooler sealing O-rings, dynamometer test sheets, and an installation manual.