C4 shift adjustment

[Richard Paige]

I have a 66 with a very mild 289. I have about 19'' of vacumm at idle. The C4 was rebuilt about a year ago and has always shifted too early. I almost always run it where it starts in 2 and shifts to three. It will shift as early as 15 mph if i am taking it easy. When I use the 1-2-3 selection it's even worse, it almost immediately shifts to 2nd and shortly after to 3rd. I have tried adjusting the vacumm modulator and it seems to have little effect. Will the band adjustments raise the shift points and which one does what? Thanks for any input.

 

[Grayle]

I have that same problem. The tranny shifts smoothly, but it seems to shift to second almost immediately after take off.

 

[akd67]

I dont know a lot about trannys but I wonder/hope a shift kit would help? I have a b&m in mine and havent ran it yet.It wasnt hard to install or very expensive.

 

[Ozsum67]

It's shifting about like it should. Not ideal for racing, but think of all the fuel you are saving.

 

[Richard Paige]

Thanks for the replies. One other thing, when coming to a stop, I have to almost come to a complete stop before it shifts back down to second. Any ideas? I feel like it should shift down earlier when decelerating. Thanks for all the input.