IDENTIFICATION
Transmission identification numbers are stamped on left side of transmission case, near oil pan flange. (Scheme 1) Identification numbers may be required when ordering replacement components. Transmission components may not be interchangeable. Identification number is required to ensure proper component application.
Scheme 1
DESCRIPTION & OPERATION
The 45RFE automatic transmission is electronically controlled and includes a lock-up torque converter and dual stage oil pump. With the addition of a 3rd planetary gear set, one reverse and 5 forward gear ratios are possible. Although this transmission is typically a 4-speed, the 5th gear ratio is actually an alternate 2nd gear ratio known as "2nd prime" and is created by the addition of the 3rd planetary. The primary 2nd gear ratio fits between 1st and 3rd gear ratios for normal through-gear accelerations. The alternate 2nd gear ratio (2nd prime) allows smoother 4-2 kickdowns at high speeds to provide 2nd gear passing performance over a wider cruising range. The 45RFE automatic transmission is contained in a one-piece aluminum case.