904 Transmission 1-2 shift control valve spring install help.
Your on the right track with what you need to do but the 1-2 shift valve and the 1-2 shift control valve pictured above is not the same and not all valve bodies (i.e. older ones) have a shift control valve. But that doesn't matter because what you need to change is the 1-2 shift valve spring to get the 1-2 rpm shift higher. If your VB has a 1-2 shift control valve adding the 1/4" check ball to it (basically blocking it's function because it only moves about 1/4") will not affect shift rpm. At the moment I can't find the picture I'd like to post but here is one showing the location of the 1-2 shift valve. The VB is turned around from the picture in the article but you can see it's next to and much smaller in diameter than the shift control valve spring. You do need to drop the VB to do the swap
Your on the right track with what you need to do but the 1-2 shift valve and the 1-2 shift control valve pictured above is not the same and not all valve bodies (i.e. older ones) have a shift control valve. But that doesn't matter because what you need to change is the 1-2 shift valve spring to get the 1-2 rpm shift higher. If your VB has a 1-2 shift control valve adding the 1/4" check ball to it (basically blocking it's function because it only moves about 1/4") will not affect shift rpm. At the moment I can't find the picture I'd like to post but here is one showing the location of the 1-2 shift valve. The VB is turned around from the picture in the article but you can see it's next to and much smaller in diameter than the shift control valve spring. You do need to drop the VB to do the swap
