It's supposed to have a .500 boost valve...
It's
supposed to have - but
does it have a .500 boost valve? That is the question...
Along with the questions about valve body parts I mentioned..I'd also expect to see other VB mods such as, but not limited to:
- Line bias valve blocked off
- TV limit valve shimmed
- TV boost valve updated (Transgo or Sonnax)
- TV plunger and sleeve (Sonnax)
- 3-2 downshift valve blocked inboard
- 1-2 accumulator regulator valve fitted with a different spring for less accumulator flow to the acc side of the 1-2 acc piston in the housing
- Governor modified to match intended performance (
did you check the governor?)
- possibly one or more check balls deleted from VB or case based on other mods performed
This stuff needs to be verified...ESPECIALLY given that's it has been behaving as described since you bought it.
You may be looking for some, simple easy fix to resolve but I'd caution you to not get married to that notion, if that is the case...Based on everything you've relayed, trans has to be investigated, at minimum, to confirm hydraulics have been so-modified/updated to meet your performance requirements as well as address common issues w/these transmissions. I'd also want to know what the pump clearance was but unless you're willing to pull it apart, wash everything up then measure pump clearance, there's no way we can assess the condition of the pump internally, which could be the main (or one of) driver of your symptoms.
ETA - check your TV bracket-cable geometry as this can also cause your problems. The geometry has to be spot-on, not just 'close'...Otherwise, line pressure rise will be suboptimal..It's probably the closest thing to a quick/easy fix that I can give to you...
Check all the above, let me know what you find and we can go from there.