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A 4L60E has a case connector on the passenger side of the vehicle where the wiring harness will hookup. This connector is located next to the servo cover. As opposed to the 700R4, there is no governor cover. The 4L60E 1 piece case was produced between 1993 and 1996. These units were the same shape as the 700R4 but were controlled by a computer. The 1 piece case and 700R4 both feature a 4 bolt pattern on the rear.
From the year 1997 and up, 4L60E transmissions had a 2 piece case with a removable bellhousing and a 6 bolt pattern on the rear. Starting in 1999, LS engines had a 4L65E, indicated by having a top bolt hole at the 12 o'clock position. Units produced in 2007 and later are 4L70E's indicated by a 15 pin connector versus the old 13 pin connector.
The transmissions produced in 1993 and 1994 are interchangeable for any 4L60E 1 pc cases. 1995 transmissions, however, are vehicle specific because the OHMs have different readings.