New Question of the Day

[Mark Yacavone]

I just read the rule book down load about automatic shifting in Stockers .
I couldn't c&p it from there, but it says that electric upshift can be used in the vehicle was originally equipped with a computer.
Are they talking about engine management computers or about auto transmissions originally being controlled by the computer? Or maybe delay wiper or electronic cruise control computers?
Reason I ask is because the factory /experimental cars came with T400's and PG's, which were shifted by a governor originally.

[Keith 944]

That’s funny, but a very good point

[SSDiv6]

Originally Posted by Mark Yacavone

I just read the rule book down load about automatic shifting in Stockers .
I couldn't c&p it from there, but it says that electric upshift can be used in the vehicle was originally equipped with a computer.
Are they talking about engine management computers or about auto transmissions originally being controlled by the computer? Or maybe delay wiper or electronic cruise control computers?
Reason I ask is because the factory /experimental cars came with T400's and PG's, which were shifted by a governor originally.

Factory Stock cars running the TH-400, Powerglide, or C-4 are not computer controlled.

I believe this applies to the other EFI cars that have computer-controlled transmissions.

[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

[Billy Nees]

I've been told that certain FFFords had electronic trans in '94?

[Mark Yacavone]

I guess it depends on where you look ..No wonder NHRA is confused on this subject.


GM upgraded the 4L60 to electronic control with the 1993 model year and these transmissions were used in a wide variety of applications from the Camaro and Corvette to full size cars and light and medium duty trucks. The big improvement was total electronic control which eliminates the need for the troublesome TV cable and also did away with the spinning weights and springs used in the governor, since input and output speeds are now measured by sensors and the up and down-shifts are controlled by an electronic transmission controller.

FWD
GM started adding electronic controls to the 4T60 in 1990 with the Cadillac Allante carline's unique F7, and 1991 and after with the corporate 4T60-E.

[GTX JOHN]

I have not seen them police the 1 -2 shift for years.

I would not worry about it in any Stocker!

[GTX JOHN]

I have not seen them police the 1 -2 shift for years.

I would not worry about it in any Stocker!

[Mark Yacavone]

Originally Posted by SSDiv6

Factory Stock cars running the TH-400, Powerglide, or C-4 are not computer controlled.

Joe, So they can or can't used electric solenoids and control box to make their shifts?