[Mark Yacavone]

It looks like 1997 and newer GM RWD cars would be the first ones to be able to use electronically controlled upshifts.
Anything earlier , the lock up converter function only, could be employed
Is that correct?

Enter the 4L60 and 4L60E

GM renamed the TH700R4 in 1990 as the 4L60 to reflect its purpose as a four-speed with a longitudinally placed matching engine and a gross vehicle weight rating of up to 6,000 lbs. The automaker made no mechanical changes to the TH700R4. In 1997, the electronically controlled-shift version became available in rear-wheel-drive cars and two- and four-wheel drive trucks. The sixth-generation Chevrolet Corvette was also equipped with the 4L60E transmission. The 4L60E used solenoids and electronic actuators to control the clutches, valve body and bands to shift gears. GM's Vehicle Speed Sensor and a vehicle powertrain computer determined when gear shifting was optimum. T