JoeNova

From gear ratios. They have very different ratios.
I have dyno sheets showing that power loss is pretty much negligible.

LS6427

iTrader: (2)

Yes, but it would be very slight....and the bonus of a much stronger and better transmission is worth GOLD.

Plus, the 4L60E is a ticking time bomb in any car at the drag track. Especially in a big heavy truck...... 4L80E will do pass after pass, all day long, with no worries.

.

98CayenneT/A

Fair enough I stand corrected

I just know that after 80e swaps in my experience have felt slower, weather it be gearing + the extra weight ect.

98CayenneT/A

I hear ya, I don't necessarily agree with ya about the 60e being absolute trash but get what your saying especially in the Op's scenario

wht/73

I agree it "might" be a lil slower coming from a 60e vs the t350 I'm swapping it for.
The ratios are almost the same for me.
Therefore the 60's will be very close and there's not such a drop off at the 1st to 2nd gear change on the 60e.

fakky

Thanks guys - appreciate both sides of thought.
Now looking for a 4l80e

Will altering the rear diff gear ratio help ? Or don't worry about it ?
Not a strip car (for now)

DD/street fun.

fakky

Trans Gearing
3.059 1.625 1 0.696 2.29 4l60e
2.48 1.48 1 0.75 2.07 4l80e


REVS
4l60e
10.79827 5.73625 3.53 2.45688 8.0837 3.53
12.5419 6.6625 4.1 2.8536 9.389 4.1

4l80e
8.7544 5.2244 3.53 2.6475 7.3071 3.53
10.168 6.068 4.1 3.075 8.487 4.1


Seems like 4l80e with 4.10 gears will mimic a gearing of a 4l60e at 3.53 ..... the most

LS6427

iTrader: (2)

No....never said it was trash.

I had 500 RWHP/500 RWTQ from 2002 till a couple years ago when my new 390ci went in. I would only rebuild my tranny every 2-3 years, but it only cost me like $300.00 to have my friend do it. Only hard part I ever broke was one sunshell. It did me well.....but I was on street radials that spun easy and never took it to the track for a hard launch on slicks.

No way it would have lasted if I was doing hard launches every weekend.

Mine was just a roll racer for fun on the street.

Now....sitting in my storage unit is a Level 4 4L80E good for 1,400 HP. Along side that is my complete Huron Speed V2 turbo kit.....so I'm upping things to about 1,100 RWHP in November. So my 4L60E is getting sold w/converter.

It was good to me......

.

clinebarger

4L80E. There.......I said it!! Tire Diameter makes a huge impact on final drive ratio.

There are 2.97 & 2.75 Low gearsets.

fakky

Who's known for doing good builds on these. If or when I go aftermarket unit.

clinebarger

I build, But NOT A VENDOR!

fakky

I already had your details saved

fakky

Thought of another question ..... drive by wire V drive by cable

How does it work with regard to kick down /TV cable

I'm assuming that still exists in either case .... so if I grab a 4l80e too go with an engine that didnt originally have one ..... I would also need to grab the kickdown cable and full linkage for the transmission

Rest is programming.
?

wht/73

The e transmissions don't use tv cables. It's done with tcu programming..
If that's what you were asking.

fakky

Yes - basically

So only physical linkage is the automatic gear shift column ? Drive/Reverse etc

Shift and kickdown done fully electronically ........ regardless of DBW/DBC throttle etc

JoeNova

Yes... only a shift cable. Everything else is electronic.

Spartan7

iTrader: (7)

OP, how heavy is that truck? Planning on towing with it? My truck's drivetrain is similar to what you're looking for (6.0L and 4L80E, roughly 6000 lbs). It has 4.10's in the rear from the factory for towing, but it's a great gear for puttering around. Has a good powerband, but gas mileage suffers, obviously. If you're not planning on towing too much, I'd consider 3.73.

As far as building, look into Century Transmission. They just built mine. It costs more, but they'll build it right.

fakky

Yeah not planning to tow much ....... wouldnt trust the frame although Im sure its probably fine

Looks like around 3000 lbs .......
http://www.59apache.com/specs.pdf

I've always ran 3.53 previously ....... but towed. I liked the gearing. But with that trans gear on a 4l80e kinda reads that a higher rpm gear like 3.73 or 4.10 might be better.

Thanks for the feedback.

Cpt.Derrek

iTrader: (13)

I just finished upgrading to a 4l80e on my bolt on LS1. Sure light throttle from 1st seems a bit slow, but paired with a 3k stall it'll spin the tires just as easy if not easier than the 60e would. I actually like the 1st and second gear ratios more. I'm an avid AutoX and having a taller 1st gear meant it isn't nearly as drastic dropping back into 1st for those tight corners and I can stay in 1st much longer instead of blowing past 1st and having to just stick in second. I also noticed I didn't need 3rd on some of the fast parts where with the 60 I'd need either bounce of rev limiter or shift into 3rd then need to hit the brakes. Anyways I love being able to shift as hard as I want and not worry about blowing up that poor little 60. Also I spent hardly any more cash to get this 80 than I did trying to rebuild and build the 60 to handle anything.

wht/73

That is because the gear spread isn't that far as compared to the 60.
I can't wait to have 4th plus lock up.
I have a 4400 5C converter on it's way to me as we speak so the 80E "should"
be very close to the t350 with the 8" treemaster.
Thanks for posting your results.