It's too late to get a hold of Dana @ Pro-Built Auto but I have a question just the same....... I hope that I can get it answered before the weekends done so I can keep going.......
The question is about the 3-4 accumulator...... (700-2&3 Reprogramming Kit page 7) step 2...... Dana wrote to leave the piston and spring out of the bore even though the Trans-go instructions say to re-install them.......

So if I leave the 3-4 accumulator piston and spring out of the bore what does it do for the transmission?
Has anyone else done the same thing.......... I'm sure that we all get the same instructions from Dana............I'm not questioning Dana or his instructions..... everyone has nothing but great things to say about the man and he's already helped me out a bunch with previous questions ......

I just have to know cause I won't be able to move forward with a clear conscious till I know what leaving the piston and spring out does

Thanx in advance

 

Accumilators are cushions essentially. They regulate 'bleed' off of that circuit. There is a 1-2 and a3-4 accumilator in the 700R4. The stiffness of the spring determines how much pressure is applied to those circuits. Harder spring will keep the accumilator from softening the impact and a lighter one will allow it to fully cushion it. B&Ms el-cheapo ****-kit comes with a spacer sleeve. Basically instead of cushioning it, it allows the fluid in to a point before the circuit shift occurs. The longer the sleeve, the less 'fill' time for the accumilator and result is a sooner/harder shift. Leaving it all out doesnt make sense at all. Fluid would essentially just fill the big cavity, shift would ne real soft and late IMO. I dont even think it would work at all IMO. This is the way I understand the accumilator and its function. Most good kits will hae a larger/stiffer spring. I believe the 'Purple' one is the most used. I think it was for Deisel apps and carried over to Hi-Po. The sleeveing spacers just suck and will destroy the soft aluminum accumilator piston. This is from Experience. B&M can bite my a$$ on their getto kit

 

The TransGo kit instructions have the 4th accumulator piston placed into the bore first, then the spring. In this manner the accumulator is disabled. This is the same as leaving them out. Also note that the feed (edit: was bleed) hole in the 4th accumulator bore is to be plugged.

RBob.

 

Oh my god!!!!!!!! I didn't even realize that by plugging the hole at the bottom of the bore it would make the 3-4 accumulator piston useless...... no fluid will enter!!!!!!! Therefore no need to re-install the piston and spring!!!!!!!
Thanks RBob for opening my eyes!!!!!!!!!

OK now what will that do for the transmission??? Bypassing the 3-4 Accumulator that is? I'm just trying to get my head around this stuff.
I try to understand the complexities of the bigger picture when I work on my own stuff.
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I can't believe I overlooked the plug with no hole!!!!!!!! yeesh......

 

By disabling the 3-4 accumulator the 4th apply to the band will engage it more quickly. Prevents excess slip which causes heat and wear.

RBob.

 

I guess on the 3-4 shift its not that bad to do. The kit I had done once had it done on the 1-2 accumilator (spacer sleeve method) and it caused horribly hard shifts during any throttle input. That was a stock 305 H motor too back then. But isnt there other ways, lie boost valves to increase line pressure and shift valve springs that will get the same result in a better manner?

 

plugging either accumulator causes extreemely hard bang shifts which will shorten the life of your trans. if the stiffest spring isnt enough find a spring to fit inside and double them up like you do for valvesprings. I use one from the local hardware store that just fits over the shaft but touches both the case and piston.

 

I would "NEVER" do this on the 2nd gear accumulator, as it can be devastating to the transmission. As for the 4th accumulator assembly, this is not a concern when using a 10" or smaller torque convereter.