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Old 12-22-2012, 10:59 PM   #1
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Join Date: Jul 2003
Location: North NJ
Posts: 20
Car: 07 TBSS and TB "RS"
Engine: 6.0L LS2 & 5.3 LH6
Transmission: 6L90 & 4L70
Axle/Gears: 4.10 and 3.42

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6L80 Trans TPI conversion...

Ok...so I've done the 6L80/90 swap in my Trailblazers and helped a few others and the LS-engine thing is a bit been-there-done-that. Now I'm looking for a swap that has some hair on it's chest...and wouldn't hurt if there was some demand for it....so I'm thinking....hmmmm...what about a nice low revving, torque motor in a lightweight sexy, great handling car....and cheap to boot. So I find myself missing my old 350 TPI Formula and T/A. Best part is mildly modified 305's and 350's should easily get into 12's from the swap alone. What do you guys think?
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Old 12-23-2012, 01:47 AM   #2
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Location: Chico, Ca/ Misawa, Japan
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Car: 88 Formula 350
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Transmission: T-56
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Re: 6L80 Trans TPI conversion...

I don't see how putting in a 6 speed auto in a TPI car is going to magically make it a 12 sec car...

Although I will subscribe because I would love to put a 6 speed auto with an LsX in one of these cars...

Last edited by Bullydawg; 12-23-2012 at 01:55 AM.
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Old 12-23-2012, 01:48 AM   #3
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Join Date: Jul 2000
Location: Aridzona
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Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

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Re: 6L80 Trans TPI conversion...

I wouldn't bother, given the potential of the LS engines. TPI is great for "feels good" torque but isn't the way to go for most torque under the curve or speed.

If a significant power producing Gen I SB was already in-hand, I'd go straight to EFI Connection's 58x system.
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Old 12-23-2012, 02:05 AM   #4
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Join Date: Jul 2003
Location: North NJ
Posts: 20
Car: 07 TBSS and TB "RS"
Engine: 6.0L LS2 & 5.3 LH6
Transmission: 6L90 & 4L70
Axle/Gears: 4.10 and 3.42

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Re: 6L80 Trans TPI conversion...

It doesn't magically make a TPI faster. A 6L80 has a tremendous first gear that is the equivalent of 4:10 and numerically higher rear gears....but allows you to still have a decent final O/D gear.

Last edited by Blckonyxx; 12-23-2012 at 02:17 AM.
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Old 12-23-2012, 04:05 AM   #5
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Re: 6L80 Trans TPI conversion...

Quote:
Originally Posted by Blckonyxx View Post
Best part is mildly modified 305's and 350's should easily get into 12's from the swap alone.
Quote:
Originally Posted by Blckonyxx View Post
It doesn't magically make a TPI faster.


You're conflicted.
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Old 01-06-2013, 03:43 AM   #6
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Car: 07 TBSS and TB "RS"
Engine: 6.0L LS2 & 5.3 LH6
Transmission: 6L90 & 4L70
Axle/Gears: 4.10 and 3.42

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Re: 6L80 Trans TPI conversion...

Quote:
Originally Posted by Blckonyxx View Post
It doesn't "magically" make a TPI faster. A 6L80 has a tremendous first gear that is the equivalent of 4:10 and numerically higher rear gears....but allows you to still have a decent final O/D gear.
I failed to put emphasis upon my point. A 6L80 will make a TPI faster the same way puttin' a 3.90, 4.10, etc. rear end will make a TPI faster...but while still maintaining highway fuel economy.
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Old 01-06-2013, 10:10 AM   #7
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Re: 6L80 Trans TPI conversion...

Alright.
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Old 01-06-2013, 11:41 AM   #8
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Engine: 369 TPI
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Re: 6L80 Trans TPI conversion...

How are you going to control it?
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Old 01-06-2013, 08:56 PM   #9
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Car: 90 IROC 2-92 Zs blk vert & prpl
Engine: stealth ram brodix track 1 ful port
Transmission: 700r4 4l80e
Axle/Gears: iroc 375 lokr 92 Z 277 pos vert 327

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Re: 6L80 Trans TPI conversion...

Control it!!! How are you going to install it? Those things are huge. A 4l80E fits nice and tight and it is turbo 400 size. A 6l80 is MUCH BIGGER. You would have to lower the engine and possibly move it forward to have a chance. The height is going to demand some cutting which means trimming the console and playing with the heater duct and radio. I would LOVE to have pics of this adventure. Even if you fail I salute you for having the grit to try it. They are the ultimate trans though and we could have paddle shifting on the steering wheel then.
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Old 01-06-2013, 09:58 PM   #10
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Join Date: Feb 2005
Location: GA
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Car: '90 C1500
Engine: SBC MPFI
Transmission: 4L80e
Axle/Gears: 4.30

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Re: 6L80 Trans TPI conversion...

I would be interested in one behind my 383 in my 1990 C1500 truck with 4.30 gears. Definitely would have to have a custom torque converter to hookup to a SBC flexplate. I have one in my G8 and it's a very nice transmission once you get all of the settings in the programming set right. It shifts very nicely! However, I see $$$ being a problem as it could be cheaper for some to go with the 6 speed from TCI with a .75 overdrive gear compared to the .67 from the 6L80e.
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Old 01-06-2013, 09:58 PM
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