This new 4L60E four-speed automatic transmission assembly features electronic control of shift points, shift feel and torque converter clutch application. The two-piece transmission case allows use behind GM engines that have a Chevrolet V8 bellhousing bolt pattern and produce no more than 370 lb-ft of gross engine torque. This gearbox features a 3.06 first gear ratio for great acceleration and a 0.70 overdrive fourth gear ratio improved fuel economy. The high stall torque converter produces a stall speed of approximately 2300 RPM behind most small-block engines. The output shaft does not contain provisions for a mechanical speedometer application. The production use of this transmission assembly was for the police package 350 Vortec powered Chevrolet Tahoe. For proper transmission operation for both carbureted and fuel injected applications a control module and wiring harness is also available separately. 4L60E gear ratios: 1st 3.06, 2nd 1.75, 3rd 1.00, 4th 0.70. Use with transmission controller P/N 12497316.