1000/M74 2006 Chevrolet/GMC Silverado/Sierra 3500 6.6L AWD/4WD – Remanufactured 6-Speed Automatic Trans

Description

Calibrated for one-ton diesel four-wheel transport, Allison 1000 Remanufactured Automatic Transmission units for 2006 GM Sierra and Silverado 3500 6.6L four-wheel drive chassis controls immense Duramax turbo-diesel output. This remanufactured unit handles 460 continuous input horsepower, 650 lb-ft maximum input torque, and 4000 RPM maximum input engine speed while holding hydraulic line pressure at 230 PSI.

Heavy die-cast A380 aluminum casing encases triple planetary gear trains formed from heat-treated 8620 steel. Segmented graphite friction plates with high-flow fluid grooves suppress heat across all internal clutches. Precision-reamed Gen-4 six-speed valve body bores house hard-anodized aluminum sleeves to stop internal hydraulic pressure leakage. Sump capacity measures 15.0 quarts of certified automatic transmission fluid, utilizing 1/2-inch cooler lines. Total dry weight measures 330 lbs without fluid, fitted with a balanced multi-disc lockup torque converter.

Key Features of Allison 1000

Fleet supervisors choose to buy Allison 1000 remanufactured automatic transmission units to conquer severe transport routes with six-speed diesel power. Factory remanufacturing replaces all critical components to guarantee exact hydraulic shift points and continuous torque transfer under maximum gross combined trailer weights.

• 8620 steel planetary gearsets handle continuous 650 lb-ft Duramax diesel torque without gear tooth deflection.
• Segmented friction discs dissipate localized heat to stop clutch plate burn in severe commercial service.
• 15.0-quart deep fluid pan keeps hydraulic circuits primed during steep off-road climbs.
• Gen-4 six-speed valve body eliminates hydraulic cross-leaks in this remanufactured Allison 1000 package.
• 6 forward speeds offer dual overdrive ratios with a 0.61:1 sixth gear for highway fuel efficiency.
• 230 PSI maximum line pressure clamps clutches tight to prevent intermediate friction plate slippage.
• 29-spline output shaft interfaces straight with four-wheel drive transfer case hubs.

Six-Speed Diesel Torque Thermal Flow

High-displacement internal oil pumps maintain line pressures between 190 and 230 PSI, holding operating fluid temperatures within 165°F to 195°F. Input torque absorption handles 650 lb-ft at 1600 RPM without clutch slippage. A gear reduction range from 3.10:1 in first gear to a tall 0.61:1 in sixth overdrive keeps Duramax diesel engines inside their peak torque band at lower highway RPM. The transmission cooler loop sheds excess BTUs through 1/2-inch ports, cooling rotating clutch packs and protecting planetary thrust washers from excessive heat wear.

Transfer Case Flange Mounting Specs

A 29-spline rear output shaft links straight to standard four-wheel drive transfer cases. Rear bearing retainer runout is held within 0.0015 inches on dial indicators, preventing vibration through the transfer case. Tailhousing bolt patterns match factory transfer case adapter plates flush, maintaining precise driveline centerlines on dual-rear-wheel four-wheel drive chassis.

Dynamometer Load Screening Maintenance Schedule

Every unit undergoes dynamic testing on an automated spin dyno under full diesel engine load simulations to calibrate six-speed solenoid shift points, verify cooler port flow rates, and evaluate lockup clutch hold. This transmission is not engineered for triple-turbo competition pulling trucks, pro-mod drag racing setups, or operation with blocked radiator heat exchangers.

• Check transmission fluid level and color using the dipstick every 14 operating days.
• Drain and replace synthetic automatic fluid plus external spin-on filter every 25,000 miles.
• Flush transmission fluid cooler circuits every 12 months to prevent friction particulate buildup.

Commercial Crate Manifest Warranty Inclusions

A 3-Year unlimited mileage warranty protects commercial fleet buyers against premature mechanical and hydraulic defects. Each sturdy wooden transport crate holds the complete remanufactured automatic transmission, a calibrated lockup torque converter, an external spin-on fluid filter, full matching installation instructions, and fluid specification documentation tags.