CLASS RACER FORUM - View Single Post - GM 700-R4 questions.....

ss3011 · 08-05-2010, 08:01 PM

This is a cable operated transmission, and shifts based on road speed and throttle cable position. As an engine loses power, when it is old and worn out, or out of tune, you have to step on the throttle more to get the vehicle down the road. Sometimes we have seen this happen if the catalytic converter gets plugged. Many times these old vehicles are so weak, the throttle position needs to be opened so high that all the upshifts feel delayed, the fourth gear shift is at a higher mile per hour then you are going. Does the transmission shift into overdrive if you backoff the throttle but downshifts back into 3rd if you step back into throttle , to maintain road speed ? Same could be happening with the TCC. There is a throttle position load release for TCC. So once the TP is higher than a calibrated number, say 30% then TCC will not come on.

08-05-2010, 08:01 PM	#3
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: GM 700-R4 questions..... This is a cable operated transmission, and shifts based on road speed and throttle cable position. As an engine loses power, when it is old and worn out, or out of tune, you have to step on the throttle more to get the vehicle down the road. Sometimes we have seen this happen if the catalytic converter gets plugged. Many times these old vehicles are so weak, the throttle position needs to be opened so high that all the upshifts feel delayed, the fourth gear shift is at a higher mile per hour then you are going. Does the transmission shift into overdrive if you backoff the throttle but downshifts back into 3rd if you step back into throttle , to maintain road speed ? Same could be happening with the TCC. There is a throttle position load release for TCC. So once the TP is higher than a calibrated number, say 30% then TCC will not come on.