I was just curious as to what effects reversing the TV modulator upshift and downshift valve springs would have. I have 1-3, and 4 but if I give it any gas hardly it down shifts back into third. I think I may have reversed these two springs during the rebuild (#s 302 and 304 in the ATSG book) What are the right colors for them if I pull the VB to check. Also, any other thoughts on what may be causing this issue?

 

Leave the TV modulator upshift and downshift valve springs alone. The TV plunger sleeve 4-3 downshift passages are what controls the 4-3 downshift as to how easy or hard the 4-3 downshifts are obtained. You can block these passages with two small Allen screws and a dremel, $.34 cents for two. This will eliminate the 4-3 downshift at higher speeds (apx. 65-75mph), and at lower speeds you still will have the 4-3 downshift, depending on the rear end gear ratio. If you have access to a few 700R4 valve bodies, then you could locate one that will make it harder to get a 4-3 downshift, but not eliminate it all together.

 

I have the no 9C1 3-4 assembly in my 700, so I'm good to go there. My problem is that I have a 4th gear that drops into it then downshifts out afterwards in OD. I took it apart and found out the 4th apply piston was backwards last night, but still no dice on it. I was just wondering if I re-installed the TV up and downshift springs into the wrong passages if it would effect it by not having a 4th gear.

 

The upshift and downshift valves cannot be mixed up, the same for the springs, they are different sizes. The bigger valve has the light spring, and the smaller one a heavy spring. You could recheck all of your work, but I would call TransGo at 626 4437451 ask for Dave, he should be able to help you out here.