Kerr

I just want more gears... the 8100 only spinn to 4800 rpms.. and 34" tires and 4 gears to choose from it would tow a LOT better with more transmission gears... both our denalies have the 6L and its awsome in a stock suv... lol.. nothing like dropping 3 gears at 80 mph when you want to pass some one

MNC5

FLT, wishing they were working in the 6L80-90 arena

Wide Open

The 6LxxE series is really nice with the deep first gear and the taller overdrive than even the 4L60E. Of course, installing one in a pre-07 vehicle can be expensive and a headache. You will have to use both PCM's to control the engine/transmission and the other to run the gauges.
Good luck.

fastnblu

iTrader: (2)

Wide Open, u probably told me in a PM before, but refresh my memory. How much did it cost to do your conversion? Any idea on how the cost breaks down? Can u separate the tranny cost from the other items?

Which tranny did u go with, didn't you use the 6L80E?

05HD1500

i was interested in this as well but i think im just going to go with the gear vendors overdrive... can split it to an 8 speed or just use the overdrive on 4th and make a 5 speed, either way its only 3000, and bolts in. a bit easier that a 6l90 conversion.

note: the tci was a 4l80, converted to 6 sp, used paddle shifters though...pretty b@d @$$ IMO...

Wide Open

My costs were:
$600 - to have Speartech modify my wiring harness to plug into my truck, run the gauges and operate the A/C.
$200 - purchase of a longer rear driveshaft to fit the shorter 6L80E transmission.
$100 - installation of new U-joints on front drive shaft and have it cut 1" shorter.
$80ish - for two 07+ A/C hoses to accomodate the newer compressor connections. This wasn't needed but I chose to use the new compressor instead of the original one on the engine I took out.

That was it to get it going.
Of course there was the cost of the engine and transmission that I purchased as a package so i can't break the transmission cost down.
I used the 6L80E version.

Bo185

The only way to do this is swap out the crank trigger to the 58x one = $$$$. Or swap to a Gen IV motor LY6 or L92. As the TCM in the 6l80/90 needs to talk to a Gen IV ECM for it to work right.

Speartech did a Gen IV LS2 6l80 swap in a GMT800. https://www.performancetrucks.net/fo...d.php?t=401899

No one makes a standalone kit. I called TCI and they said no. And their 6 speed is just a modded 4l80 and is WAY over priced.

Remington H.

iTrader: (2)

beat me to it.

as it was said, nobody makes a stand alone kit for the gen IV gm transmissions.

Bo185

Who ever does this first will be a rich man!!!!

gvantuyl

My ECU is the original 2006/2007 ECU. The 6.2L has a 58x reluctor. Which is run through a lingenfelter 58x to 24x conveeter then on to the ECU. I swapped the transmission for a 4L85e. This is a 4WD. I also added a 3/4 Ton Tear end. With Firestone airbags in the rear. My only thing I wish I could do is upgrade to a 6L90E transmission. But I would need a new ECU and instrument cluster. My mechanic Matt Snell says I have gone aa far as I want to take this. That or he is tired of performing miracles.