Quote:
Originally Posted by rev_jeff_hayes
Hello all. I wanted your input before I do what I'm thinking. After tweaking my trans, I still have a too-hard 1-2 shift. After thinking of ways to soften it without causing flare in the other shifts, I've wondered about the length of the rocker arm from the throttle linkage to my VCV. On mine, I have about 15-20 degrees of play before my VCV bleeds vacuum. My rocker arm is set to eliminate those degrees of play, so that immediately on throttle my VCV begins to bleed. What if I readjusted the length of the rocker arm so that my VCV retained those 15-20 degrees of play before bleeding vacuum. Would this soften the 1-2 shift without flaring the others? What do you think? I'm asking because I imagine - given how tight it is behind my VCV - that it's going to be a bear to get that rocker arm off. To my mind, that would keep the most vacuum to my trans during acceleration from stop, hopefully making the 1-2 shift (right now occurring at 2400 rpm) softer.
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The rocker arm is set properly. Don't try to misadjust it.
If the VCV on that vehicle is adjustable, then attempt to raise the vacuum level slightly........by 2" or so.........and see if the 1-2 will soften a bit without causing flare on the 2-3. It's a bit of a balancing act. But, older 617's will all have a harsh 1-2. This was subsequently corrected in '84 with different valve body springs.
You can also adjust the Bowden cable for earlier shifts. If the 1-2 occurs at 1900 rpm, it will be much more tolerable than if it occurs at 2500 rpm.