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Old 02-02-2015, 11:31 AM   #57
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Pete
Before you sign on the dotted line, you should be sure of what was ordered for you. At my insistence, the sales manager confirmed that GM is not accepting orders for the max trailer tow package with the 6.2 liter engine. However, you can order this with the 5.3 liter engine and perhaps this is what you're getting. The 5.3 does come with a 6-speed automatic, just like last year. Only the 6.2 comes with an 8-speed. The max trailer tow with the 8-speed does come with a 3.42 rear axle. I believe the 6-speed comes with a 3.73, because of its higher first gear.
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Old 02-02-2015, 11:35 AM   #58
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The truck that I have coming is due in late March. It is the full 4 door, 4x4. Like I said the specs are really confusing when you look at the Max tow package. The NHT package states a 6 speed trans but it may be restricted to the 5.3 engine. The dodder entail ratio is also somewhat confusing as it looks like they warn to stay away from the big wheel when you get the 20" wheels. Like I said, this looks like the closest thing to what I am looking for. Will have to wait and see what arrives. Checked with the dealer and he can order the max tow with the 6.2 now, but I don't think he really has a handle on the order specs either.
Still have to deal with the better half over the colour.................. It never ends. I just want to hitch up and get out of the cold and snow!
Will let you know how I make out
Thanks to all
Pete
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Old 02-02-2015, 11:48 AM   #59
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5.3 = 6 speed and 3.73 gears with maxtow
6.2 = 8 speed and 3.42 gears with maxtow

5.3 = 6 speed and 3.08 or 3.42 gears without maxtow
6.2 = 8 speed and 3.23 gears without maxtow
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Old 02-02-2015, 12:08 PM   #60
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Quote:
Originally Posted by dznf0g View Post
5.3 = 6 speed and 3.73 gears with maxtow
6.2 = 8 speed and 3.42 gears with maxtow

5.3 = 6 speed and 3.08 or 3.42 gears without maxtow
6.2 = 8 speed and 3.23 gears without maxtow
Rich, Which configuration is your new truck, and how is it doing towing the trailer?
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Old 02-02-2015, 12:37 PM   #61
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Steve, it's a NON- MaxTow 6.2L, 8 speed, with 3.23 gears, GMC Sierra. Z71 susp. Double cab, (old Extended size) 6.5 foot bed, SLT with All-Terrain package.

I won't know till I get the trailer out of storage. ( got a foot of snow yesterday!!!!) I know it will be overloading the rear axle with much, if any , of my toys aboard. I should be able to get a feel for the 6.2/8 speed even though rear gear will be a bit higher (lower numerically). I'll get some weights and measures....but it won't be till March or early April...depending when winter departs. I also have an AS parking pad install project awaiting the Village release of concrete flatwork. So spring plans are in flux.
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Old 02-02-2015, 12:50 PM   #62
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We had a 2005 Avalanche 1/2 ton 5.3L 4L65E with 4.10 gears. I added a GearVendors OD unit.
This made all the difference with the wide gaps in the 4L65E.
I towed in direct / OD on the hwy and OD/OD when not towing. In the Mountains I spent a lot of time in 2nd / OD.

I was looking at the new GM's but found the trans gearing and axle gearing just not up to the task.

I took a hard look at the other 1/2 tons and found that the Tundra was what I was after.
5.7L , 6 speed and 4.30 axle that puts the others to shame. It's gearing is spot on for towing and cruising. The down side it only has a 27 gal gas tank.

The dark one was on the test drive ,The white one is ours.
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Old 02-02-2015, 08:58 PM   #63
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Rick
thanks for the information on the truck. will be seeing the dealer on the weekend to try to get my head around what he has coming in. The information that he gave me was unclear. Like I said I will wait to see what comes in, check the build sheet and test drive it with the trailer on its back.
Did get a hold of Dexter axles regarding the GM brake controller. They think that the 2015 truck MAY operate their E/H disc brakes so yet again will see it when it comes in. will keep you posted.
thanks again
Pete
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Old 02-03-2015, 10:48 AM   #64
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Glen, what is the yellow payload sticker on the driver's door show for your Tundra's available load just to compare with the Chevy 1500. A hypothetical Tundra 5.7L Double Cab 4x5 with a payload of 1800lbs with a 35 gallon tank would be my ideal tow.

Kelvin
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Old 02-03-2015, 07:30 PM   #65
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I'm thinking that the GM with the 6.2 and 8spd is going to be geared a lot better than the Toyota.
1st gear comparison sees the Gm at 15.59 overall in first,
10.15 in second
7.11 in 3rd
5.77 in 4th
The Toyota is
14.32 first
8.4 second
5.8 third
4.3 4th
Toyota only has 2 more gears left at this point while GM with superior HP and Torque has 4 left.
No contest.


George
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Old 02-03-2015, 11:40 PM   #66
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Quote:
Originally Posted by KJRitchie View Post
Glen, what is the yellow payload sticker on the driver's door show for your Tundra's available load just to compare with the Chevy 1500. A hypothetical Tundra 5.7L Double Cab 4x5 with a payload of 1800lbs with a 35 gallon tank would be my ideal tow.

Kelvin
We our's is a 2014 2wd dbl cab, the yellow sticker says 1520 # and the gas tank is only 27 Gal. but the aftermarket has a 36 gal replacement tank for a mere $1200. There is talk that Toyota may come up with a 36 gal tank soon.

Our Tradewind weighed 4320# when we dragged it home. By the time I'm done with the rebuild including a washer and a dryer it should come in around 5000# and with our gear around 5500#.
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Old 02-03-2015, 11:59 PM   #67
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Quote:
Originally Posted by gandttimes View Post
I'm thinking that the GM with the 6.2 and 8spd is going to be geared a lot better than the Toyota.
1st gear comparison sees the Gm at 15.59 overall in first,
10.15 in second
7.11 in 3rd
5.77 in 4th
The Toyota is
14.32 first
8.4 second
5.8 third
4.3 4th
Toyota only has 2 more gears left at this point while GM with superior HP and Torque has 4 left.
No contest.


George
Our Tundra is a 2014 , at the time we were looking GM didn't have an 8 speed.

But the GM 8 speed doesn't have a direct gear thus it's either under or over drive creating more heat then when the Tundra is in 4th. That said at 60 mph the Tundra likes 5th gear which is overdrive. It pulls our Tradewind happily .

I find the gear spacing on the Tundra just right with no big rpm changes between gears and enough gears for all situations.
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Old 02-04-2015, 12:33 AM   #68
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If I may, I believe what G and T was trying to point out is that the rear differential gearing ratio is only part of the picture in determining how well a vehicle is geared to tow. As manufacturers move towards greater numbers of gears in these automatic transmissions the ability to have a really low overall ratio in first doesn't necessarily depend on having a really low rear differential. It had been argued earlier on in this thread that, on the strength of it's differential gearing, the Tundra is better geared for towing. As George has pointed out, that's only part of the question. And, frankly, this thread was started to discuss an individual who is currently shopping for a TV so, while your point about GM not having an 8 speed transmission when you bought yours may be correct, it's not all that probative for a current buyer.

As for the gear spacing between 6 and 8 speeds, my experience was that 6 speeds was more than enough... until I drove a truck with 8. Ram and GM are already selling them and Ford seems to be planning to skip right to 10 speeds. I imagine diminishing returns kicks in at some point here but I don't really know where. I expect Toyota will follow suit in the near future.

Also, the GM 8L90 does have a direct drive gear, it's 6th. http://www.thetruthaboutcars.com/201...-transmission/
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Old 02-04-2015, 05:30 AM   #69
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That is basically what we would call a double over transmission,seems like most every one is going to that ,lower rpm's = better fuel mileage! my 6.7 dodge with 6 speed auto and 3.73 gears , goes down the road, with our 31' classic, in 6th at 1525 rpm easy.....
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Old 02-04-2015, 07:59 AM   #70
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It doesn't matter whether you are achieving the sweet spot for a particular load with the trans or the diff.....or wheel/tire rolling radius. The performance of a vehicle at a particular load is a function of "effective gearing" which is a function of all three mentioned above.

Unless you have a multi-speed rear axle (big trucks only), more gears in the trans allows for sweet spot achievement over a wider variation of loads and terrain than a single "fixed" gear in the rear end.

The trend for more gears allows a manufacturer to tune the engine to a more narrow RPM band, bringing it closer to the efficiencies of an Atkinson cycle theory of operation.
Combine the theoretical use of an Atkinson, with variable valve timing and multiple gearing and you are getting closer to a practical application for real world vehicles. Next is individual, real time valve regulation, that will not only control the timing of valve opening and closing, but duration and lift as well. That will allow for closer tuning to Atkinson theory and probably will result in MORE gears.

Those who argue a lower rear end gear(numerically higher) aren't wrong....just somewhat outdated in their outlook. I am confident Toyota will follow suit with higher gearing in the rear end and more speeds.....they have to, IMO.....and probably for 2016 model year. BUT, Toy sells more small cars as a ratio to 1/2 ton trucks than GM, F, and R, so they may get past the 2016 CAFE and their shift may come later....but it will come.
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