Chevrolet Performance launched a new SuperMatic 4L75E-R transmission at the 2021 SEMA Show in Las Vegas this week, which is the highest torque capacity transmission in the 4L60/4L70 series line of products.
Chevy says the 4L75E-R was designed specifically to handle the torque output from the automaker’s new ZZ632 Big Block crate engine, which is factory rated at 1,000 horsepower and 876 pound-feet of torque. The closely related 4L75-E is only rated at a maximum of 650 pound-feet of torque, so the 4L75E-R will be the transmission of choice for customers with very high-torque applications. For reference, the lesser 4L70-E is rated at up to 495 pound-feet of torque, while the entry-level 4L65-E is rated at 430 pound-feet.
The 4L75E-R also offers a higher torque rating than the 4L85-E (which is rated at 685 pound-feet), despite featuring smaller overall packaging/dimensions.
“The 4L75E-R is designed to handle every pound-foot it can put to the pavement—in a smaller, lighter package than our SuperMatic 4L85-E transmission,” Chevrolet Performance says.
Other highlights of the 4L75E-R include a strong six-pinion input carrier and sun gear, a heavy-duty output shaft, a higher capacity servo and specific valve body calibration. It has identical gear ratios to the 4L75-E, which are as follows:
- 1st: 3.06
- 2nd: 1.62
- 3rd: 1.00
- 4th: 0.70
Like other electronically-controlled GM four-speed automatic transmission, the 4L75E-R can be used with both Small Block and Big Block carbureted engines, as well as LS fuel injected engines. A different electronic controller is required for carbureted engines versus fuel injected engines. The transmission is not sold with a torque converter, with the customer required to purchase this separately from Chevrolet Performance or a third-party store or supplier.
Chevrolet Performance also sells other components necessary for installation of its electronically controlled four-speed automatic transmission, including a bell housing and transmission installation kits complete with a crankshaft flange, flexplate, flexplate covers and fasteners.
The 4L75E-R is available to order from the Chevrolet Performance catalog now.