4L80E & TH400 Tech.

[clinebarger]

Originally Posted by Danger D

Clinebarger, this is an amazing thread! I stumbled on it looking for info to rebuild my 80.

I used to be a member but couldnt remember my password or email I had at that time, so forgive me for skipping the newb thread.

My question is. I have read about the dual feed and was wondering why some drill a hole in the drum when they do it, but you dont?

Also, what do you recommend to do as far as building mine to survive? I have a BBC that will make around 1200 on nitrous. I will not have a brake. Not a street car. I am going to use the electronics to control it, but wired for manual operation. Only shift 1-2 and 3 under full throttle, but would like to know how to make 4 strong enough to take a shift at WOT... Thank you!

It's not that a don't drill a Bleed Hole in the Direct Drum, I have & still do in certain applications.

[Danger D]

Originally Posted by clinebarger

It's not that a don't drill a Bleed Hole in the Direct Drum, I have & still do in certain applications.

What does it do, and would I need it for my application?

[clinebarger]

Originally Posted by Danger D

What does it do, and would I need it for my application?

If your revving over 5500 RPM, A .030" Bleed Hole in the edge of the Drum along with High Rate Direct Return Springs are required. These two things keep the Direct from "Soft Applying" in 1st & 2nd gears, Soft Applying burns the Direct clutches.

The Overdrive Sprag & Overdrive Planetary Carrier will not like WOT shifts into 4th with 1200HP.

CK has a Billet OD Carrier....http://www.ckperformance.com/View/4L...NETARY-CARRIER
HAS TO BE USED with a '91-'96 Overrun Clutch housing & Sprag! The Early OD Sprag is larger than the '97 & version.

You will also need....
Billet Input Shaft.
Billet Forward Clutch Hub.

These two are optional, But over 1000hp are Recommended.
Billet Main Shaft.
Billet Sun Gear Shaft.

[Mavis79]

How much setback should the torque converter on a 4L80 have from the face of the bell housing? I can't seem to get my trans and engine connected with out binding. It acts as if the converter is not fully seated but I've had it off and on 3 times, spin it once on the input shaft and I always end up with about 9/16" setback when I need about 15/16". http://i183.photobucket.com/albums/x...s79/image.jpeg