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View Poll Results: Which Automatic Would You Choose?
TH400 4 57.14%
42RLE 0 0%
Other 3 42.86%
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Old 10-10-2019, 07:24 AM   #1 (permalink)
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TJ- 5 speed to Auto Swap

I've got an '03 TJ......Stretched/ Tons/ Atlas/ Stickies/ ORIs. I have every intention of doing an LS swap in the future, but I'm really starting to hate the 5 speed. I want to swap to an automatic, but I'm not sure if I want to wait until I'm ready for the LS swap to do that. I know it's not the BEST choice, but I have a freshly rebuilt TH400 sitting on the shop floor. Should I consider adapting that to fit behind the 4.0, or look for a Jeep automatic (42rle)/ ecm/ harness to fit? Am I overlooking another option? Or should I just keep wheeling it as-is, and wait until I'm ready to LS swap it to add the auto at that time?
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Old 10-10-2019, 08:39 AM   #2 (permalink)
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I have a 97 TJ. Originally a 4 cyl and 5 speed rig.

I swapped in a 350 and TH400 to Atlas over 10 years ago.

If I were to do it again, I'd go LS with matching year's automatic, and use that car's wiring and computer as a complete package. The only thing I miss on my current setup is having an overdrive.

Currently running 4.56 gears in the diffs, and swap between 37s and 40s on the tires. RPM at freeway speeds varies, but it's always around 3000 to 3200 rpm, and with V8 power I'm sure I could easily drive freeway in the 2000 rpm range, if i had another gear.
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Old 10-10-2019, 08:48 AM   #3 (permalink)
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Originally Posted by Treeclimber View Post
I have a 97 TJ. Originally a 4 cyl and 5 speed rig.

I swapped in a 350 and TH400 to Atlas over 10 years ago.

If I were to do it again, I'd go LS with matching year's automatic, and use that car's wiring and computer as a complete package. The only thing I miss on my current setup is having an overdrive.

Currently running 4.56 gears in the diffs, and swap between 37s and 40s on the tires. RPM at freeway speeds varies, but it's always around 3000 to 3200 rpm, and with V8 power I'm sure I could easily drive freeway in the 2000 rpm range, if i had another gear.
Thanks for the reply, @Treeclimber. I'm good with the LS, but I don't have much interest in an electronically controlled tranny.

I've got 5.38 gears, and the Atlas is 4.3:1. Tires are 42" Reds, but I do have a set of 40" MTRs (old pattern) for driving on the street. It sees VERY LITTLE street use though.....a few times each summer, I'll drive the family to dinner or out to grab ice cream.
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Old 10-10-2019, 09:04 AM   #4 (permalink)
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Originally Posted by beaureed445 View Post
Thanks for the reply, @Treeclimber. I'm good with the LS, but I don't have much interest in an electronically controlled tranny.
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Pretty sure that 42rle is electronically controlled.

If I had my choices, I'd go LS to 4L80 to Atlas... Not the 4l80e, but the 4l80.
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Old 10-10-2019, 09:13 AM   #5 (permalink)
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Originally Posted by Treeclimber View Post
Pretty sure that 42rle is electronically controlled.

If I had my choices, I'd go LS to 4L80 to Atlas... Not the 4l80e, but the 4l80.
Yep, the 42rle is electronically controlled. Brain fart on my part. And I also overlooked the 4l80 option, and was only thinking about the 4l80e. Thanks for pointing that out to me.
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Old 10-10-2019, 11:18 AM   #6 (permalink)
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Yep, the 42rle is electronically controlled. Brain fart on my part. And I also overlooked the 4l80 option, and was only thinking about the 4l80e. Thanks for pointing that out to me.
Are you sure they made a 4L80 non-e? Im my research, I think they only made the 4L80E. Could be wrong though.
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Old 10-10-2019, 11:54 AM   #7 (permalink)
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Are you sure they made a 4L80 non-e? Im my research, I think they only made the 4L80E. Could be wrong though.
They didn't. There's no governor or provision for a governor, so shifting has to be controlled electronically or with a manual vb. The th400 was renamed the 3l80 for a few years until the 4l80e came out.
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Old 10-10-2019, 12:54 PM   #8 (permalink)
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Swap in the TH400 and then use it when you do your LS down the road..
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Old 10-10-2019, 01:38 PM   #9 (permalink)
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Originally Posted by Boomtacoma01 View Post
Swap in the TH400 and then use it when you do your LS down the road..
That was my thought as well, @Boomtacoma01. And it'll already be mated to the Atlas (need to swap input shaft on Atlas, and add the adapter).
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Old 10-10-2019, 04:14 PM   #10 (permalink)
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Could also do an AW4 swap and keep your existing Atlas & input all the same, run a standalone shifter for it (several options out there, and continue using it with the LS in the future...
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Old 10-10-2019, 04:16 PM   #11 (permalink)
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Are you sure they made a 4L80 non-e? Im my research, I think they only made the 4L80E. Could be wrong though.
Not sure. I always believed they did, but, after reading your post it sure seems I am wrong.
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Old 10-10-2019, 04:59 PM   #12 (permalink)
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Wait until LS swap. Turbo 350 w/ full manual valve body.
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Old 10-11-2019, 06:36 AM   #13 (permalink)
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Originally Posted by Technohead View Post
Wait until LS swap. Turbo 350 w/ full manual valve body.
The TH400 that I have is freshly rebuilt, with a manual valve body. I planned to use it with the LS instead of a TH350.
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Old 10-11-2019, 09:16 AM   #14 (permalink)
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The TH400 that I have is freshly rebuilt, with a manual valve body. I planned to use it with the LS instead of a TH350.
Cool. Did not realize you already had a th400. I like the th350 because it's a bit shorter. Minor detail, especially for a stretched rig.
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