700R4 build thread.

[WTO]

Looking for some ideas on how to correct line pressure flutter in 3rd or 4th over 1/2 throttle. Gauge bounces from 125-200PSI rapidly. I see it was recommended not to block the line bias valve, I'm confident that is the cause of my pressure problem.
Trans is in a 68 C2500, 4:11 gears and worn out 327. I have a 355 ready to go in but want the trans 100% 1st.
Valve body modifications were the transgo SK700 kit. I went back and reduced the boost valve from .500 to the next one down, .475 I believe. This improved shift feel but did not fix the line pressure flutter.
TV cable geometry is set up properly. The trans works/shifts perfect, without a pressure gauge you would never know there was a problem.

[beanious]

Hello all, wanted to see what your thoughts are regarding 700R4 - 4L60 - 4L60E servo pins.

Option 1: The 84-87 pins had (2) teflon rings to seal the servo pin.



Option 2: In 87 there was a factory update and following this they did not include the shaft seals.



Option 3: Sonnax has a servo pin that has (2) teflon seals and an o-ring.



Note, there are also different lengths but I'm not really focused on length rather the seals (2 ring tip, 3 ring tip and HD band)

[beanious]

Which do you think is better? Do you think the more seals the better, no seals are required, all original 84-87 w/ only 2 seals??? Transmission experts input requested!