Thanks for checking...must be my calipers.

Wanted to make sure I installed the correct amount of shims rather than in-out i-out in-out with the pump.

I checked the roller bearings and the new ones are "Koyo." I think this might be contributing to my end play discrepancy.

I called three shops and no one had the #74 selective washer.

 

Anyone seen an accumulator mod where the 1-2 and 3-4 springs are removed?

 

The horrible old B&M shift kit replaced the springs with spacers which effectively eliminated the accumulator's function to soften the shifts. It would be like side-stepping the clutch with ever shift on a manual transmission.
It may be OK for 16 years old who want to chirp their tires with V6 engines, but with a V8 it quickly causes parts to fail, either internal trans parts, or u-joints or driveshafts.
All that assumes the springs were replaced with spacers, which should be obvious.

On the other hand, if the springs were removed completely, that is common on the 3-4 accumulator but not on the 1-2 accumulator. I don't know how the 1-2 shift would feel without any springs.

So what did you find - just no springs or springs replaced with spacers?

 

OK, now this mod makes sense to me. I found two pistons and this spacer inside the accumulator (below). The plate is a mess between the accumulator springs. I was lost at how two springs (accumulator size) would be lost in my garage...they were gone long before.

The trans was a mess functionally. Maybe it was a good trans at one point. Estimated two weeks for a rebuild....going on two months. Must stay patient....

 

As I understand it, in the (horrible) B&M shift kit there is a spacer on each side of the piston so that it does not move at all.
Looks like your piston moved and really slammed the separator plate.
The accumulator work by having accumulator pressure between the separator plate and piston; this is the main dampening. The springs modify the accumulator operation.

You might consider getting a blown 4L60E on craigslist so that you have all the correct hard parts and springs and can see how it is supposed to go together. I have bought them for $75 and is how I first learned about them.

 

Terribly frustrating....finish one thing then I discover something new and have to wait on more parts. Wife asked a few days ago "when will this be done?" I played the politician and didn't give an answer. Here I am waiting on parts again. I sure hope all this waiting results in a good transmission after all said and done.

This end play thing is not sitting well with me. They did make a most extreme #74 selective washer that would have put me within tolerance, but it was cheaper to just use the Sonnax shims to get a better result. I used three that put me at .008. I am wanting to blame the Koyo roller bearings and one bushing at the bottom of the case on the final end play.