4L80E & TH400 Tech.

[Mrturner1]

Where do I get a checkball to drive into the 2nd accumulator? And how do I block the 3rd accumulator? Also how do I get the holes drilled to exactly .200"? Are you saying it's going to break because of how hard it shifts?

[clinebarger]

Originally Posted by Mrturner1

Where do I get a checkball to drive into the 2nd accumulator? And how do I block the 3rd accumulator? Also how do I get the holes drilled to exactly .200"? Are you saying it's going to break because of how hard it shifts?

.250" checkballs are the standard size for all GM automatics, A local trans shop will have 500,000 of them laying around.

I covered blocking the 3rd accumulator in post 11.

A #8 .199" or #7 .201" drill bit will be fine.

Yes, The risk of Hard Part failure increases greatly with the way you want it to shift, The Intermediate Sprag will most likely go first if the Intermediate snap ring doesn't blow out.