Im thinking about my fresh built TH400 instead of a 4L60E
06-19-2012, 11:12 PM
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Im thinking about my fresh built TH400 instead of a 4L60E I have a brand new TH400, I know there is no overdrive, but I am wondering how that would work out for me... Has anyone used one in their LS swap?
06-19-2012, 11:57 PM
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Go with a 4L80E.... You'll need overdrive if the car is driven on the freeway.
3000 rpm on the freeway going 60 mph gets old real fast with a 3 speed automatic.
Most everybody on here says that the turbo 400 is mainly for track use or city driving.
I just bought a 4l80e on craigslist for 350.00
3000 rpm on the freeway going 60 mph gets old real fast with a 3 speed automatic.
Most everybody on here says that the turbo 400 is mainly for track use or city driving.
I just bought a 4l80e on craigslist for 350.00
06-20-2012, 01:00 AM
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In a 4l60e, in 3rd gear with no lockup equals over 4k to do 70mph 
thats with a 3.73 rear on a stock tire. That would be the equivalent of a TH400 gearing. Not for me.
thats with a 3.73 rear on a stock tire. That would be the equivalent of a TH400 gearing. Not for me.
06-20-2012, 12:33 PM
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Go with a 4L80E.... You'll need overdrive if the car is driven on the freeway.
3000 rpm on the freeway going 60 mph gets old real fast with a 3 speed automatic.
Most everybody on here says that the turbo 400 is mainly for track use or city driving.
I just bought a 4l80e on craigslist for 350.00
3000 rpm on the freeway going 60 mph gets old real fast with a 3 speed automatic.
Most everybody on here says that the turbo 400 is mainly for track use or city driving.
I just bought a 4l80e on craigslist for 350.00
I suspect you are not building a trailered track-only car; for that a TH400 is perfect.
For any significant street use get a 4L80E for 600+ HP and a 4L60E for less than 500HP. (Between 500 and 600HP, there are various opinions.)
I've seen posts of people regretting putting a TH400 into their LS street cars, not fully realizing how much noise and gas-guzzling that causes.
To get good advice here you need to detail what your car is, HP goals and usage of the car. Just add-ons, NO2, turbo, supercharger, etc.
06-21-2012, 07:12 AM
#6
This brings up a question from me, is there a source vehicle that came with a more preferred (by us street/strip Fbody guys) gear ratio or some other unique aspect of it in an iteration of the 4L80E?
Thanks,
Dave
Thanks,
Dave
Last edited by mightyquickz28; 06-23-2012 at 06:13 AM.
06-21-2012, 07:39 AM
#7
If you run a TH400, 28" tire brings the revs down a speed. I run a TH400 28" tire, 3.70 rear and I only dropped 4MPG and went up a few hundred RPM over the 6L80 I replaced. I dont think that is too bad from a locked converter with double overdrive to a non lockup 3 speed.
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06-21-2012, 09:14 AM
#8
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Ask sponsor Jake Performance who is THE expert on the 4L80E.
I enjoy tuning and changing the tune on my car weekly and after each run at the track. I love being able to change the trans shift points and properties from my laptop.
With a 4L80E you will be able to run 11's (or better) at the track and still get 20mph on the highway in an LS car.
06-24-2012, 07:03 PM
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06-26-2012, 09:53 PM
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Change in plan.... Someone please help me out with what I would need to with use my TH400 behind my 5.3/6.0L swap... I have an LS swap book, but it doesnt mention the 400 much.. I know I will need an adapter to go on the flywheel is? (I read something like that a while ago but cant find it now.. What else will I need in order to make it work.. I have a 70 chevelle... my TH400 is already installed in it with a trans brake and shift kit.
What would I need in order to make the fuel injected LSx work.. By the way, I am going to turbo it along with the initial swap.. Just in case that matters...
Along with a 92MM TB, ls6 intake, LS6 or Z06 cam, LS6 or Z06 springs, and 243 heads... This is the plan.... I had to skimp on the xmission because I have a perfectly fresh rebuilt one in it now....
(I am aware of the possible high revving at 70mph on highway..)
I thought I would mention... I have highway gears in my chevelle now.. 273 or something close... Not in the 3's..)
What would I need in order to make the fuel injected LSx work.. By the way, I am going to turbo it along with the initial swap.. Just in case that matters...
Along with a 92MM TB, ls6 intake, LS6 or Z06 cam, LS6 or Z06 springs, and 243 heads... This is the plan.... I had to skimp on the xmission because I have a perfectly fresh rebuilt one in it now....
(I am aware of the possible high revving at 70mph on highway..)
I thought I would mention... I have highway gears in my chevelle now.. 273 or something close... Not in the 3's..)
