4L80e Recommendations for a LS3 57 Swap
I've got the motor, a PSI wiring harness for DBW and 4L80e operation, an ECU tuned for 4L80e operation, a TCM (hopefully) calibrated for 4L80e operation and tons of other stuff to get it in the car. For example, I've learned from this site that I need an offset flexplate with the LS3 and a 4L80e, so I bought one that I saw the P/N listed for on a few threads. So, between the flex plate, harness, ECU and mounts, I'm committed to a 4L80e.
Problem is, I have no idea who to get a trans from! LOL!
So I need recommendations on who to buy from. Here are some quick facts:
Budget is ~$2K for the trans, <$800 for the converter
Will NOT race, only a street car
No "used" (no take-outs)
Brand recognition is a factor (GM, Hughes, etc, no Maddog, no eBay, local shops are out as well)
I'm sure I'll need to include more info, let me know what I'm missing. Thanks in advance for the help!
Also, here's a couple pics of what's getting the trans.

No, thanks. For one, I don't intend to work on this thing as often as my other LS vehicles. Second, can't find one in a local junkyard. Third, I wouldn't trust a local shop for crap on a trans rebuild. Fourth, I have it in the budget to buy a rebuilt one from a reputable shop. I can go on, but basically, I'd like to buy once and forget it for years.
For reference, I'm eyeing the 3000-3200 stall Circle D basic (big, 11"?) converter for $550.
For reference, I'm eyeing the 3000-3200 stall Circle D basic (big, 11"?) converter for $550.
See, here's the thing... I'm not from 'round here. Over the 9 years I've spent here, I've come to the conclusion that this area is awful for anything performance. There's a trans shop in my neighborhood, and I wouldn't trust them to know what a shift linkage is. I heard great things about a guy in Long Beach, MS and went with him on some work with my B4C. Tried bolting up a converter that he bought, wrong bolt pattern. Turns out, he apparently didn't know that my 98-02 Camaro had a 4L60e from the factory. Um...
My father in law started the other day, "Hey, you were looking for a 4L80e, right?" Stopped him there... he's blown two or three TH350s in a '48 Chevy with no more than 300hp at the flywheel with locally built transmissions. Basically, I won't even consider a local trans. Kind of snobbish, but based on experience, it's not worth the headache.
Bumping it up, looking for more recommendations. A few builders on the short list, but still looking for good recommendations for a reliable, minimally strengthened 4L80e. In the mean time, I went ahead and bought/powder coated a pan, bought a Lokar floor shifter, a dipstick... I mean business, need the trans!
Last edited by themealonwheels; Nov 9, 2017 at 11:51 AM.
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I did more research and saw Circle D mentioned. I ordered a Circle D 2600 stall during Black Friday, so I gave them a shout. Their price was not competitive, but the guy I spoke with knew what I was going for and tried to steer me to a GM Performance 4L85e for $3,422. Right now, there's a $250 mail in rebate, which helps. And it's a new GM unit, which also helps. The price is way out, but I'm starting to talk myself into it.
From what I've read, the 4L85e is a beefy 4L80e, like a 4L65e is to a 4L60e. So, does that mean the TCM I had programmed for a 4L80e will control the 4L85E? Will the converter I bought for a 4L80e work in the 4L85e? I'm not convinced this is the way I'll go, but it's worth thinking about.
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