4L80E & TH400 Tech.

[-TheBandit-]

clinebarger, thank you for the great tech advice!

Originally Posted by clinebarger

Blocking the 2-3 Accumulator. (TH400)

You will need a 5/16-18 tap & a 5/16" set screw.
Tap it just deep enough for the set screw to seat good.

The red arrow is the accumulator feed hole that needs to be tapped & plugged.

When blocking the 2-3 accumulator feed port, should you remove the spring under the accumulator piston?

Originally Posted by clinebarger

3rd Feed Hole, 140" is good if your Blocking the 2-3 Accumulator.
If leaving the Accumulator functional, .175" is where I like it.

Before anyone gets their panties in a wad over such a big 3rd feed hole......The plate in the pic is from a '70 Cadillac TH400 that had a factory 6 friction Direct Drum & has a .175" 3rd feed hole stock.

Regarding blocking the 2-3 accumulator vs. leaving it functional and using a larger 3rd feed hole, do you have a preferred approach? What are the tradeoffs?