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Old 04-07-2012, 06:22 PM   #1
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LT1 trans help

I have the Chevy LT1 built, it is around 500hp at the crank. Now I was planning on using the stock nv3500. I know it will blow up as soon as I get on it but if y'all knew what I was working in y'all would understand. But anyways I have kinda decided to maybe do an automatic. Since I will be doing a lot of rock crawling. Now my question is should I stay with a standard or go with an auto. I'm a novice at crawling but a very experienced driver with a standard. Please help my brain can't handle anymore thinking haha

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Old 04-07-2012, 06:39 PM   #2
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I vote for an auto. TH400 should bolt up I think. They are pretty tough! You can always get the transfercase geared lower to help with "Crawling".
My dad has a 383 that is really radical in his CJ7 with a TH400 behind it. Going on 10 years with ample abuse and still going. Might not be 500hp but north of 400.
I love an auto myself. I'm putting a 5.3l in my CJ7 right now with a 4l60e behind it.
Let me know how it goes. Sounds like fun.

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Old 04-07-2012, 06:59 PM   #3
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Quote:
Originally Posted by Geno
I vote for an auto. TH400 should bolt up I think. They are pretty tough! You can always get the transfercase geared lower to help with "Crawling".
My dad has a 383 that is really radical in his CJ7 with a TH400 behind it. Going on 10 years with ample abuse and still going. Might not be 500hp but north of 400.
I love an auto myself. I'm putting a 5.3l in my CJ7 right now with a 4l60e behind it.
Let me know how it goes. Sounds like fun.
4l80e is the best auto behind an LS1. Its a turbo 400 with an overdrive.
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Old 04-07-2012, 07:05 PM   #4
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I'm wandering what kinda mods I need to do to my tj. My brain is burnt from doing to engine stuff. That 5.3 is a great motor my buddies dad just put one in his YJ.
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Old 04-07-2012, 07:20 PM   #5
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4l80e is the best auto behind an LS1. Its a turbo 400 with an overdrive.
True, but not much aftermarket support for them yet. They have a "soft" feel to their shift. It wouldn't have a crisp shift to it.
But if you want an auto, it wouldn't be a bad choice.

As far as mods to your TJ, not sure. You can get a stand alone computer and harness. Do not know how to integrate it into your chassis.
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Old 04-07-2012, 11:06 PM   #6
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I don't want to hijack, but I'm looking at an LT1 swap or LS1 and want to know a good manual transmission that will bolt up. I have an AX15 already, but know I'll need to to adapt it.
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Old 04-07-2012, 11:14 PM   #7
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Quote:
Originally Posted by Geno View Post
True, but not much aftermarket support for them yet. They have a "soft" feel to their shift. It wouldn't have a crisp shift to it.
But if you want an auto, it wouldn't be a bad choice.

As far as mods to your TJ, not sure. You can get a stand alone computer and harness. Do not know how to integrate it into your chassis.
A shift kit will fix that. My 4L80 will break the tire loose on wet streets on the 1-2 shift with my mostly stock 6.0L
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Old 04-08-2012, 09:16 AM   #8
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Quote:
Originally Posted by Geno

True, but not much aftermarket support for them yet. They have a "soft" feel to their shift. It wouldn't have a crisp shift to it.
But if you want an auto, it wouldn't be a bad choice.

As far as mods to your TJ, not sure. You can get a stand alone computer and harness. Do not know how to integrate it into your chassis.
Even the 4L60E is a light shifter behind my 4.8 but with enlarged and enhanced servos and boosting of the line pressure with computer tuning itll kick quite well. The servos are from the Corvettes transmission.
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Old 04-08-2012, 09:41 AM   #9
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The th400 is not computer controlled right? Cause that kinda attracts me to it.

Burton any trans will bolt up with an adapter. Goto advanced adapters they have everything.
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Old 04-08-2012, 09:52 AM   #10
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7R400 is non computer controlled also

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