GM 4-Speed RWD Overdrive Transmission

4L60E
1993-2003 - Electronically Controlled, with TCC

700R4
1982-1993 - Non-Electronic, with TCC
 

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Still in production, the 700R4 / 4L60E transmission is one of the most popular GM RWD transmissions of the 80's & 90's.  The early 80's 700R4 was plagued with issues, but after 1987 most of the issues were addressed in production.

In 1993, the fully electronic 4L60E transmission was introduced which requires a computer to operate.  With the 4L60E, it is imperative to follow the interchange rules because of solenoid & design changes by year.  For example, the 93-94 4L60E will interchange, 1995 Non-PWM will only interchange with the 1995 Non-PWM, the 1995 PWM will only interchange with 1995-1997 PWM, 1998+ will interchange (except for removable bellhousing).

Cores & part prices depend on the year.  Later model cores can be moderately priced.  Performance parts are readily available for all years.  The 700R4 is a great transmission swap for muscle car restorations to add the overdrive option & to update to a modern transmission.