What speed is it going into overdrive? Do you have a brake switch in series with the lock up? What rear end ratio? Is the TV cable set correctly with the correct linkage ratio?

 

If the speedo is correct ,Its going into 4th at about 35 or 40. The tranny shop set the TV cable. yes I have a brake switch. I taped into the brake pedal switch. The side that gets hot when I press the brake. 3.55 ratio

 

Shorten up the TV cable so it pulls it further at lower throttle position. So press the adjustment lock down and slide the jacket forward a bit at a time till it shifts to you liking. If you cant get the shift points where you like, you'll have to go inside and either do some valve work or mod the flyweights and/or springs on your govenor. 700r4's tend to go into 2nd gear fairly quick. Torgue convertor lock-up also can be varied by attaching the vacumn line to different ports of the carb.

 

I don,t recall seeing a vacumn line.

 

In a non-computer controlled setup, the torque converter lockup is signalled to lock up as soon as the transmission shifts into overdrive. The only delay is the time it takes for the lockup valve to operate.

If you are having lugging problems, it probably is one of two things.

1. The transmission is shifting into overdrive too soon. This is not a lockup problem but a shifting problem. Your TV linkage may not be adjusted right, or you may need to get a different governor or modify the springs and weights on the governor.

2. You might get some relief by using a vacuum switch in series with your brake switch in the lockup power circuit. The vacuum switch only allows lockup electrical power to the valve when the vacuum is above the set point of the vacuum switch.

The brake switch is a factor too when slowing, as it unlocks the converter when you hit the brake.

TCI Transmissions has a lockup wiring kit that includes both. The vacuum switch is adjustable too.

The other thing I found with the 200-4R installation in my 67 Nova is that there is a small difference if you connect the vacuum switch's vacuum line to the "ported vacuum" port on the carb. This will unlock the converter when the throttle is closed.

My Nova has a 350, pretty stock, but with a mild "RV" cam. It has 3.36 rear gears, and pretty short tires. My car is not "happy" when it's below 25 mph in o/d, locked up or not. It kind of "chugs" sometimes. I just pull the shifter back into 3rd gear and all is fine in those situations. It accelerates from a dead stop quite smoothly all the way through o/d and lockup, even with a miminum throttle position. It just doesn't like 25 mph steady with it locked. I have a GM vacuum switch on mine (not adjustable). If it was adjustable it might or might not help.

 

Thanks Rick I have an appointment tuesday to have them look at it again. I guess the worst case sceniero I can save OD for the free way.

 

Im sure I'll get argument here, but I have a 350 s-10 4X4 with 700r4 and my tranny builder made mine lockup mechanically upon going into 4th gear with no power. He was a great guy and was absolutely obsessed with 700r4's . Lost him suddenly about 6 years ago. The 2 conventional ways to lock the convertor is thru a vacumn sw or by computer/ECM.

 

Are there still oil pressure activated switches, on the valve bodies of these transmissions ? The one's I'm familiar with where in the early eighties, when early lockup was a problem. We would drop the pan, find the switch, take note of it's pressure rating, and put a higher rated switch in, that would allow the converter to lock up a higher speeds. It don't take much of a pressure increase to change this if the problem is mild, maybe three to five pounds more.

 

Mine has a B&M adjustable controller you can set the lock up at any speed you want and it was only $130.00, you still have to have the TV cable adjusted for the 1st, 2nd, 3rd shifts, seems to work fine

 

Auggie,, there are so many different configurations for wiring and switches. Then in 89 they added a auxilary valve body. the book of revisions is thicker than the service manual.