4L80E & TH400 Tech.

[clinebarger]

Originally Posted by whitels1

Cost really, I'm getting the TH400/NP205 combo for less than the price it would be for a 4l80E/NP205 Adapter.

Cool, Are you going to tear the TH400 down & rebuild?


Ok, Back to the business at hand.

Separator Plate Hole sizes, We will start with the TH400. These are suggestions. The bigger the feed hole....The quicker & Firmer the shift will be. Clutch clearance affects this as well! A loose clutch stack-up will cause a firmer shift than one that is set-up tight.

2nd Feed Hole, 125" Max.

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.

**Note, Removing checkballs will render feed hole sizes useless!