almightyshade

So I知 making arrangements to build my 05 (finally). I知 ordering an RPM level X trans and stage 4 diff. I originally planned on getting the F-1X, but someone offered to sell me their brand new-never used or unpackaged F-1A94 complete kit (10 rib bracket, intercooler, etc) for $7k

I was wondering if I should just scoop that up for now and enjoy it, then swap head units in the future? Will the level X hold the 1400whp F-1X goal? For reference, I have a SBE LS3 using the Novi 1500, 850whp on E85. And I壇 like to have my 05 in the 1400whp range

thehulk

Are you asking if a level X 4L60E will hold 1400rwhp? I wouldn't imagine it could even get close to handling 1400, but I'd call Jeremy and ask him directly. He told me that there 4L80E @1400rwhp was a maintenance item and if I recall correctly told me the only real option for longevity was the powerglide.

Im sure there are a few out there that have pushed the 4L60E really far, would be interesting to see how far though...

almightyshade

Id like to see if I can push it to 1400whp. It痴 still going to be a street car, which is why I haven稚 opted for the glide because I致e heard it痴 not ideal for highway travel

Al_Scrap

4l80 or TH400 or Powerglide.

thehulk

Well if it helps at all (it probably doesnt) i'll be pushing my 6L80E to 1300 later in 2024.

jenavet

i am 427 lsx with f1x..rpm powerglide..rpm z06 diff...c16 and i am 1200rwhp.i found her to be a real challenge on the street and the motor is basically full race.im not saying it cant be done but 1400rwhp? how you getting there?

thehulk

Sounds like he's gonna pulley down on the F1X which is very doable except for his transmission choice...

almightyshade

Do you recommend a built TH400?

thehulk

It depends on what you want to do with the car? Are you gonna cruise from town to town, or trailer it to the racetrack?

C6 Auto Transmission options:

Powerglide= Strongest, most durable but you aren't really enjoying ANY cruising above 45-50mphs. Liars, people with bad hearing and old heads will say otherwise lol
TH400= Strongest with enough gears to cruise but still a maintenance item at 1400+ & No Overdrive.
4L80E= Strongest Overdrive option for C6 I believe but same or worse issues than the TH400
6L80E= Strongest stock OD trans for C6, but require tuning from a great tuner (can be built to be reliable 1000+rwhp) but very finnicky
4L65E= I have no experience with but can be built to handle 1000rwhp +/- I think

Those are not facts, just my opinions, I am happy to hear others thoughts on what I think.

PSSSSSHC6

You did not mention the motor you plan to build. The SBE LS3 will not live at 1400whp.

Here is something to think about in this build. To make 1400whp with a Supercharger through a auto you will need a motor that's built to handle at least 1800hp crank if you want it to live. The automatics will rob anywhere from 15-25% hp through the drivetrain depending on trans/converter. To make that kind of power with the supercharger will require 100-200hp from the motor to turn that hard. Will want some big cubes and 6 bolt block and heads.

From a trans stand point any trans without OD will suck street driving if you do highway pulls or cruising. You will be screaming at 60-65mph trying to keep the trans temps down while trying to keep up with people. The 4L80 is a TH400 with OD or the 6L80. Those would be your best bet for what your talking about doing. The GLIDE will have the best chance of achieving the numbers your after because it will have the least amount of power loss through the trans. 4L65 will not live in a street car at the power level.

You should also look into something like PRO EFI, HALLTECH or Motec. You will not get 1400whp to stick on the street no matter what suspension or wheel/tire combo you try to run. You will want some form of racing traction control. If you plan to spend this kind of money you will love the safety features in these systems as well to protect your investment.

almightyshade

Currently, I want it as a street car, still highway cruise and town to town. I saw C5 Bully痴 TH400 review and he claims he can highway cruise and beat on it for pulls without issues. But he痴 only 1 out of 2 people I致e seen cruise their TH400痴 without issues

PSSSSSHC6

Bully Z is a local Texas car. I have seen it and been around a few times. Bully's car is a street car but its really more geared for the track.

You can cruising with a TH400 and you can make highway pulls. Cruising sucks with a TH400 because its a 3spd trans. If you want to get an idea of what it will be like hit your local highway and pull your shift down into 3rd gear and cruise that way. In the A4 that will be 1:1 gearing. You will be screaming at 65-80mph. Your trans temps will climb quite a bit. Then make a few pulls to 140-160mph but don't shift into 4th/OD. Its not fun!!!. I speak from experience with this subject. Street Car is a broad term........... if comes down to what your wiling live with.

thehulk

With as much progress as is being made with the 6L80E's, thats the route I would (and am) going.

Holley just came out with a controller for the 6L80E last year, and as more time goes by more people will start to have success with it at higher powerlevels. The current C6 1/4 record in a 3200lb (raceweight) vette is a 8.2X @ 16Xmph BUT Dan M. isnt telling us exactly how durable the transmission is or how many passes he's averaging before rebuilds. I have heard of a few 1400RWHP stories with the 6L80E but it survived maybe 5 passes. Keep the weight as light at possible and the transmission cool, should be a very capable unit.

Rkreigh

interested in the 6l80 build That trans looks very strong and I had heard of 1200 hp through them but not higher

the 480LE swaps and even th400 are pricey as all get out.

thehulk

I have heard of 1400rwhp going through them, but they last 4 passes (or so i've heard.)

My transmission guy has a 4400lb G8 with 1300rwhp going through his 6L80E shop car.