CK5
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New GM HD 6 speed auto
- Thread starter 76zimmer
- Start date
uao85
1/2 ton status
yep its the 6l80e and the 6l90e that come on I believe 07 and up pickups. Nobody to my knowledge offers an aftermarket controller for them yet.
Remington
Remington
romeolimagolf
1/2 ton status
Just an FYI for those that are unaware: TCI has developed an aftermarket 6 speed auto based on the 4L80E. It would probably be an easier swap for those wanting a 6 speed auto.
http://www.tciauto.com/products/6x/
http://www.tciauto.com/products/6x/
I daily drive a 6l80e There is after market controllers for them. I know a little bit about them, what in particular are you looking to hear about?
Yes it's a hydramatic and it's a whole new animal compared to the 4l60 and 80e.
This may interests you, the 6l80 and 90 share the same ratios.
http://www.maxchevy.com/features/2007/ii_3-trans-specs.html
This may interests you, the 6l80 and 90 share the same ratios.
http://www.maxchevy.com/features/2007/ii_3-trans-specs.html
It's only $6000...
http://www.compperformancegroupstor...re_Code=TC&Product_Code=271600P&Category_Code=
Rene
http://www.compperformancegroupstor...re_Code=TC&Product_Code=271600P&Category_Code=
Rene
It's a nice transmission. A guy here at work just went from from an '02 2500HD/6.0L/4L80 to a virtually identical '08/6.0L/6L80 version and pulls a larger camper all over the country. He really likes the new trans as the towing performance is better in the mountains both uphill and downhill because of more gears (he said it never shifted into 6th while towing...which is just a really high overdrive).
Empty it really helps fuel economy because combining the higher 6th gear overdrive and higher 3.73 axle it really drops the cruising rpm down, while still having more low-end grunt than a 4l80/4.10 axle truck.
Empty it really helps fuel economy because combining the higher 6th gear overdrive and higher 3.73 axle it really drops the cruising rpm down, while still having more low-end grunt than a 4l80/4.10 axle truck.
Looks like it has the same OD as a 4L80e, just has a few more gears between first and overdrive. The big upside of course is you can work with a much narrower rpm range to get the same job done.
Rene
The 5th and 6th gear are both od gears. 
Rene was talking about the TCI 6 speed which only has one OD gear.
BTW, to decode the trans numbers
6 = number of gears
L = longitudinal (the only application we care about).
90 = relative torque capacity (60<80<90)
E = electronic control
This applies to the 4L60/4L60E/4L80E/6L80E/6L90E etc.
How long are they? I know the 4L80E is longer than the 4L60 (aka 700R4).
BTW, to decode the trans numbers
6 = number of gears
L = longitudinal (the only application we care about).
90 = relative torque capacity (60<80<90)
E = electronic control
This applies to the 4L60/4L60E/4L80E/6L80E/6L90E etc.
How long are they? I know the 4L80E is longer than the 4L60 (aka 700R4).
Was going to ask where you came up with those numbers, then see you were referencing the TCI trans and not the actual 6L80E.
Most 2500HD trucks with the 4L80E had 4.10 axles combined with the 0.75 overdrive give a final drive ratio of 3.08:1. On the 6L80 trucks 3.73 seems more common so combined with the 0.67 OD it drops the final drive ratio down to 2.5:1, yet 5th gear w/ 3.73's is still slightly lower than overall then 4.10's and the 4L80 OD.......guess what I am saying is that I would love to replace my truck with one that had the 6L80 since it spends 95% of it's time running empty on the highway, and when towing the just slightly lower 5th gear ratio would work great.
uao85
1/2 ton status
who makes the controller for them? Last I heard there was a company working on developing a stand alone controller, but hadnt heard anything since then.
I believe I have seen speartech have a controller out. http://www.speartech.com/ If you click the link they have a write up for a install.
Here is a copy and paste job off the website
My only concern is will it fit under our cabs correctly?
Here is a copy and paste job off the website
My only concern is will it fit under our cabs correctly?
Note to self: after winning lottery, purchase 6L90E.
just find a used low mile one
http://cgi.ebay.com/ebaymotors/07-0...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
Shoot, $1200 doesn't sound bad. You'd pay that for a 700R4 from BTO...
...not that I have $1200 plus at least several hundred for the controller.
...not that I have $1200 plus at least several hundred for the controller.
k20
3/4 ton status
At work half our fleet are the OBS with the 6.0 and the 4l80e with 4.10s and the other half are NBS with the 6.0, 6l90e and 3.73s, and honestly, the older ones 'feel' nicer and tow better. I swear everytime I tow something with one of the new ones it seems like its ALWAYS shifting. Also the new ones the tow/haul mode seems to have no effect, whereas the older ones it will hold the gears out longer so that it doesnt shift constantly.
