Why 4L80/4L80e
Why 4L80/4L80e I want to know the reason why most of you guys swap to a 4L80/4L80e from a 6 speed. I only want to hear from the guys that are making upwards of 900rwhp. Please keep this clean. I want the pros of the Auto and the cons of the 6 speed. Thanks tech.
A triple disk converter for a 4l80 is around $1000, then a built trans can be in the $1500-2000 range, buy these and you are done. With a 6 speed, you need some serious internals to handle over 800 ftlbs of torque. Ask Tiago, counter shafts don't like more power than that. It can be done, but it requires some serious exotic parts to make it stay together. A triple disk clutch for a 6 speed that will handle serious power can be $1500 plus. Get a few thousand miles out of them and then its time to reline or replace it. On the converter, buy it and unless it breaks, then you are good for years of abuse.
I assume that if you are wanting that much power then you will either be turbo or a blower car. Forced induction, especially a turbo, works better with an auto. Boost doesn't drop off with gear changes, you can build more boost off the line on a trans brake in an auto than you can with a 6 speed.
I assume that if you are wanting that much power then you will either be turbo or a blower car. Forced induction, especially a turbo, works better with an auto. Boost doesn't drop off with gear changes, you can build more boost off the line on a trans brake in an auto than you can with a 6 speed.
A triple disk converter for a 4l80 is around $1000, then a built trans can be in the $1500-2000 range, buy these and you are done. With a 6 speed, you need some serious internals to handle over 800 ftlbs of torque. Ask Tiago, counter shafts don't like more power than that. It can be done, but it requires some serious exotic parts to make it stay together. A triple disk clutch for a 6 speed that will handle serious power can be $1500 plus. Get a few thousand miles out of them and then its time to reline or replace it. On the converter, buy it and unless it breaks, then you are good for years of abuse.
I assume that if you are wanting that much power then you will either be turbo or a blower car. Forced induction, especially a turbo, works better with an auto. Boost doesn't drop off with gear changes, you can build more boost off the line on a trans brake in an auto than you can with a 6 speed.
I assume that if you are wanting that much power then you will either be turbo or a blower car. Forced induction, especially a turbo, works better with an auto. Boost doesn't drop off with gear changes, you can build more boost off the line on a trans brake in an auto than you can with a 6 speed.
https://ls1tech.com/forums/manual-tr...p-trans-3.html
Hahaha don't see you in these parts too often Fabien, T-56 builders den is that way --> 
Took a peak at that thread, damn man you weren't kidding about sheering engagement teeth off. Do you guys find it to be more so a lack of lubrication or (what I'm assuming) simply the compressive strength of the metal/engagement teeth is/are not up to the task?
Took a peak at that thread, damn man you weren't kidding about sheering engagement teeth off. Do you guys find it to be more so a lack of lubrication or (what I'm assuming) simply the compressive strength of the metal/engagement teeth is/are not up to the task?
6speed guys are typically people that like having their cars on the street a lot and enjoy going to mexico instead of the track. The 80e is the only trans with overdrive proven to hold 900+. TH400s are nice but if you drive your car long distances and see a lot of highway time, an 80e is the absolute best choice because it has overdrive and the TH400 doesnt. Its an easy swap and can be nasty on the street and the track.
6speed guys are typically people that like having their cars on the street a lot and enjoy going to mexico instead of the track. The 80e is the only trans with overdrive proven to hold 900+. TH400s are nice but if you drive your car long distances and see a lot of highway time, an 80e is the absolute best choice because it has overdrive and the TH400 doesnt. Its an easy swap and can be nasty on the street and the track.
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Auto is generally going to be cheaper, easier to drive, and take more abuse with the power. I love my 6 speed but I suck at driving it on the track, and as inconsistent as I am now I can't imagine how bad that will be when I go turbo and big HP. I will be swapping over to a 4l80e when that happens for those reasons.
The TH400 can withstand over 3000 HP when built to do so (considerably modified, virtually no OEM parts). The 4L80E's limit is around the 1800-2000 HP level at this time. The weakness is the OD section and it's mostly the planet carrier that becomes the problem. We have a carrier being made out of billet but I've changed directions and have a different idea we're looking at right now.
It's also like Jake says, the primary weakness is the OD section, especially with the carrier and the conventional OD roller clutch.