adjusting shift points and firmness

[sstockton]

I've been told that it is possible to do on these trucks, my question is, how. Am I able to do it without dropping the valvebody, or is this all internal valvebody stuff. My shift firmness isn't too bad, and I could live with it, but if I could turn it up a bit, that would be nice. As for the shift points, my 1-2 upshift occurs at about 15mph, a little higher would be nice, and then my 2-3 occurs at about 25mph, so when I go into 3rd, my RPM's are way too low, if I'm just cruising in town they are down near 1200rpm with the converter unlocked. I'd prefer if it shifted higher so I could keep my RPM up higher and not be loading it down so much. Also, I don't really feel a 3-2 downshift, it seems like it goes straight to first, once again at about 15mph.

Thanks for any info guys.
Sean

 

[joefarmer]

You can see what effect adjusting the screws in the VB will have by temporarily setting the TV cable tighter. Then once you're happy with it, talk to your transmission builder and give them the info on how much travel is already in the TV cable the way you like it. They should make a suggestion on how much to adjust the VB screws based on what you tell them.

The exact advice my transmission builder gave me after I went through the previous procedure is as follows. "The speedo needs to be right for lockup and the tps will affect it also. If you have set the blue throttle screw right and it has the [right spring] in the 1-2 and 2-3 shift valves, try setting the cable tighter."