The 700R4 is in an Z52 '87 Corvette. The car is all stock and has around 70K original miles on it.

The problem is that it seems to hang up in gear too long when it downshifts. When cruising at about 40-45mph and you step on it, it seems to downshift okay but stays in gear too long, up to 5500+rpms, before upshifting again.

I adjusted the TV cable a couple times to see if that was the problem but it didn't seem to help any.

Thanks.

-Mike

 

Here is the adjustment procedure: To adjust the TV Cable skip the book method and do this: Press the 'D' shaped lock button on the adjuster and loosen the cable setting. Now, have someone floor the gas pedal while you check to see if the throttle plate is open all the way. Usually they are off a little and will wiggle. Do whatever you have to do to get it open solid. Now, with the pedal still floored, press the 'D' button and pull the cable casing (the black tube) back as hard as you can and release the button. You now have the engine, tranny and gas pedal all in sync at WOT. Mark the cable so if for some reason it gets moved you can know where to put it again. The problem with the 'self adjust method' is that it bends things and puts them permanently out of whack. It is also the full TV setting, which is theoretically what the GM method does.

Now I am not totally clear on this. WOT upshift should be @5500 RPM as I recall on this, right? Are you saying that you are not holding the throttle that long, that it WON'T shift up untill that point or are you saying that it WOT's too high? IF it is too high for you then you will need to go to a different Governor calibration (heavier weights) but if it won't shift till that point even if you let off the throttle then likely your Throttle Valve in the VB is sticking. Only true fix for that is the TransGo Shift Kit or Reprogramming Kit.

 

Here is the adjustment procedure: To adjust the TV Cable skip the book method and do this: Press the 'D' shaped lock button on the adjuster and loosen the cable setting. Now, have someone floor the gas pedal while you check to see if the throttle plate is open all the way. Usually they are off a little and will wiggle. Do whatever you have to do to get it open solid. Now, with the pedal still floored, press the 'D' button and pull the cable casing (the black tube) back as hard as you can and release the button. You now have the engine, tranny and gas pedal all in sync at WOT. Mark the cable so if for some reason it gets moved you can know where to put it again. The problem with the 'self adjust method' is that it bends things and puts them permanently out of whack. It is also the full TV setting, which is theoretically what the GM method does.

Now I am not totally clear on this. WOT upshift should be @5500 RPM as I recall on this, right? Are you saying that you are not holding the throttle that long, that it WON'T shift up untill that point or are you saying that it WOT's too high? IF it is too high for you then you will need to go to a different Governor calibration (heavier weights) but if it won't shift till that point even if you let off the throttle then likely your Throttle Valve in the VB is sticking. Only true fix for that is the TransGo Shift Kit or Reprogramming Kit.

 

transfixieo,

When I adjusted the TV cable, I did it by using the throttle lever instead of the gas pedal. Maybe this is where I went wrong? I had to pull the throttle lever reeeeaaaal hard to get it to click though. I couldn't get it to "click" using the gas pedal. Maybe it needs a new TV cable? Or maybe even a new accelerator pedal cable too?

-Mike.

 

Two problems, one is that if you are waiting for a click you are nor using my method and two, you use the gas pedal so that everything is synchronised.

 

Make sure the fluid level is "full when hot".... at the top of the full window, on the stick. Worked for me...

 

Being a Corvette transmission it is going to shift at about 5,500 rpm or more at WOT. The governor and shift timing valves are different than the Camaro/Firebird units. The easist way to get the WOT throttle shift down a few hundred rpm is to get a slightly heavier governor or use the B&M governor weight kit to get it exactly where you want it.