Chevrolet TH400 3-speed automatic transmission. Buick, Oldsmobile, Pontiac, & Cadilliac bellhousings available.
TH400 4x4 Level 4
Rated up to 1000 HP at the crankshaft
Rated up to 900 ft-lbs of torque at the crankshaft
Stall: 1600–3200 RPM
Converter: Custom-built billet Yank Performance converter (10", 11", 12", or 13")
Master overhaul kit with new steels
Raybestos Stage 1 racing frictions
High-capacity direct 9-clutch drum with 34-element intermediate sprag and hardened race
Extra capacity intermediate clutch assembly
New Kevlar front band
New Borg-Warner low-reverse band with heavy-duty lugs
New low-reverse spring and roller
300M billet forward clutch hub
300M hardened input shaft and reinforced forward drum assembly
300M main shaft
New Torrington bearing kit
Bushing kit with flanged no walk-out case bushing
Thrust washer kit
High-rev spring kit
Transgo competition valve body recalibration (Shift Command or full manual forward pattern)
Gearstar full race shift kit
New kickdown solenoid
Adjustable modulator
High-volume, high-flow pump assembly
New hardened pump gears
High-flow filter
New external transmission cooler
New aluminum transmission pan with a drain plug
New speedometer drive gear
New speedometer-driven gear
New torque converter dust cover
Bellhousing hardware
Torque converter hardware
Chevrolet and BOPC case options are available
| Gear Ratios | 1st | 2nd | 3rd |
| TH400 | 2.480 | 1.480 | 1.000 |
| Dimensions |
| Measurements are taken from the mounting surface where the trans meets the engine block to the tip of the tailshaft |
| Total Length: 28″ with 4″ Tail Housing 2WD Only |
| Total Length: 31″ with 9″ Tail Housing |
| Distance to trans mount center: 27″ |
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