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Discussion Starter · #3 ·
Wonder what axle ratios are being tested?
 

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Yes, they apparently used a 3.23.

No other is listed as optional across the entire M5U 8sp / Hydra-Matic 8L90 - L86 6.2 fitment.

Meaning - 2015 Hydra-Matic 8L90 (M5U) Eight Speed RWD Automatic Transmission for Chevrolet Silverado, GMC Sierra, GMC Yukon/Y Denali and Yukon /Y Denali XL, Cadillac Escalade and Escalade ESV.


Optional 3.42s seems to be a 5.3 and or 6sp AT choice. Same for all other ratios ie 3.08, 4.10 ? etc.


With the far greater gear spread - probably not needed and or desirable @ least @ this time.

They got a nice 'official' bump on some of the SUVs ( City and Combined ) and if examined in detail, more than likely something around 3.5 - 7.0 % on the ones where the over rounded official estimates did not change.


The farther into Combined and or Highway or better you go the higher the gain is likely to be.

Some will have a good bump in City cycle and below; some will not get as much although still with some sort of positive improvement very likely.

Idling is idling - for the most part.


Also..... uses a new Fluid or @ least the Corvette M5U does. I'll take 10:1 it is very similar to what an 8HP uses.

If correct, then, that is going to be an eye opening experience for some..... compared to D6.

We shall see. Maybe they found a less expensive fluid.

Currently not listed for a Standard Cab of any kind - or for at least Sierra or Silverado. ( Can't remember if both were checked.)


Was kinda' hoping that would change.


Meanwhile, worth remembering -

2014 F150 EB3.5....................... 16-18-22 / 15 - 17 -21

2014 / 2015 Ram 1500 5.7........... 15 - 17 -22 / 15 - 17 - 21 ( mid grade )

2015 Sierra / Silverado 1500 6.2... 15 - 17 - 21 / 15 - 17 - 21

2014 F150 5.0........................... 15 - 17 - 21 / 14 - 16 -19

2014 F150 6.2.......................... 13 - 15 -18 / 12 - 13 - 16


And then all the rest who come in with combined numbers of 11,13, 14, 15, 16 including a bunch of the smaller stuff....

If you look at them all, these new numbers are more than good enough against any and all with the possible exception of the Ram Diesels.

Even there, best gasser show against it is really the current 5.3 and now this 6.2. Hemi gets just enough of a ding for midgrade fuel requirement - at least technically.

If that seems a stretch, then it is the GM 6.2 then the Hemi and then the 5.3 versus the ED 3.0.


FE. goov currently lists the Colorado / Canyon 3.6 AT 2WDs and the ( Standard cab only ) ) Ram 1500 HFE 3.6 AT 2WD with an estimated annual fuel cost of 2350.

The new 6.2 GM twins with either 2WD / 4WD are estimated at 2900 $.

Somehow, that would seem like fuel money well spent -

Worth noting, the Ram 1500 5.7s come with 3100 $

The 2014 F150 6.2 AT AWD has 3800 $.
 
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