Hello folks,
I've been searching and reading a bunch of posts and have a couple questions. What is the purpose of blocking the 3-2 valves, is it primarily to prevent leakage in the 3rd circuit? Does the unit drive any different when blocked?


What is happening by blocking this check ball hole?

 

The answer to your first question is, yes blocking the 3-2 control & the 3-2 downshift shorten the circuit.
2nd question is I have not noticed or had any customer complaints from blocking the valves.
3rd question by blocking the #2 check ball for the 3rd accumulator forces the band release/3rd accumulator oil through the orifice on both the 3-2 downshift & the 3-4 upshift. Enlarging the hole allows adds to the flow to the 3-2 control that got blocked and fluid path was shortened, It also allows the increased flow exhausting the 3rd accumulator oil on the 3-4 upshift.
I don't really subscribe to this practice on a daily driver non hot rod situation. I do drill the 3rd to about .093-.110 though. In a hot rod situation/mild stall, I use that mod & .125 hole size. High stall converter .140
See the #2 check ball function in the attachment

 

@Transman Thanks for the reply.
Im just doing all I can with this unit to help the 3/4 clutches live a good long life..

One other question for the masses is the purple/yellow spring taken out of the 3-2 valve and then installed inside the AFL valve, what is that accomplishing?

 

Increases the bias on the spring end of the valve which will increase the regulated pressure in that circuit.
Takes AFL from 90 ish psi to 105 ish psi (in a decent bore)