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Any chance of a 6.2 8-spd AT with 3.42 gears?

BigRedd

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BigRedd Enthusiast

BigRedd

Posted
Posted

If I've done my research correctly, it currently looks like 3.42 will only be available for the 6.2/8-spd with the Max Tow package, and then only starting in January. I believe the 6.2 6-spd AT with 3.42 was available in 2014 so I'm hoping they'll eventually get around to it in 2015. Anybody have any info either way? Thanks.

BluByU14 Enthusiast

BluByU14

Posted
Posted

I asked this same question to the dealer when I put my order in on for my 6.2/8-Speed and they told me the same thing you had mentioned.....the only way to get a 3.42 rear is to get the NHT (Max Tow Package). The 3.23 rear is going to be the standard ratio for the remaining models without the NHT option. I currently have a 2014 6.2/6-speed with a 3.73 rear and would have really preferred the 3.42 rear, but the NHT option now comes with larger towing mirror, which looks hideous to me and is the reason why I went with the 3.23. My specific truck will be able to tow up to 9200lbs with this set up, which will be perfect for what I plan to haul.

 

I am hoping that the gearing in the new 8-speed will compensate for the taller rear-end ratio. Most of the feedback from those who have the 6.2/8-speeds w/3.23 rears have been positive when it comes to the overall performance of the truck.

 

Maybe GM will update these options/combinations down the line???

Carder09 Senior Enthusiast

Carder09

Posted
Posted

Swap the gears if you become unsatisfied with it. What's it about $400 or so per axle then for the gear(s) you buy, another 1k or so for 4WD and less for 2.

redwngr Senior Enthusiast

redwngr

Posted
Posted

8spd is new to me. But I guessing Im missing the point of buying a 6.2 with 3.08 gearing.

8 speed is not available with 3.08's.

 

for the 6.2 engine

 

2014's used the 6 speed, 3.42 was standard, 3.73 for max tow

2015's use the 8 speed, 3.23 is standard, 3.42 is max tow. Max tow for 8 speed is not available until Jan 2015.

nards444 Senior Enthusiast

nards444

Posted
Posted

8 speed is not available with 3.08's.

 

for the 6.2 engine

 

2014's used the 6 speed, 3.42 was standard, 3.73 for max tow

2015's use the 8 speed, 3.23 is standard, 3.42 is max tow. Max tow for 8 speed is not available until Jan 2015.

Must have read something wrong earlier. Even so 3.23 with a 6.2 I know its for for MPG. But performance wise you getting anything with that package vs a 5.3 with 3.73

redwngr Senior Enthusiast

redwngr

Posted
Posted

The low gear ratio(s) on the 8 speed are lower than the 6, (and the high gears are higher).

 

8 speed/3.23 in first is a lower overall ratio than the 6 speed with 3.42 (and nearly as low as the 6 speed with 3.73)

8 speed/3.23 in high gear is higher overall ratio than the 6 speed/3.42e

 

Same stroy when comparing the NHT versions.

TJay74 Senior Enthusiast

TJay74

Posted
Posted

Correct, the new 6.2/8sp option will have a lower 1st gear ratio than the outgoing 6.2/6sp transmission. If you end up going NHT to get the 6.2/8sp 3.42 option then you will not be able to get the AT package.

redwngr Senior Enthusiast

redwngr

Posted
Posted

Correct, the new 6.2/8sp option will have a lower 1st gear ratio than the outgoing 6.2/6sp transmission. If you end up going NHT to get the 6.2/8sp 3.42 option then you will not be able to get the AT package.

Correct.

 

Max tow is not available with Z71, and GAT (all terrain) includes Z71.

SMiller Senior Enthusiast

SMiller

Posted
Posted

Again in case you missed it, the 8-speed has a much lower 1st gear so it is as if you have a 4.10 rear end when taking off yet has a taller overdrive so less rpm/better mileage when empty on highway. Much closer gear spread win/win!

mdrew Enthusiast

mdrew

Posted
Posted

Anyone know where I might find the different gear ratios of the 6 and 8 speeds? I keep hearing it mentioned that the 8 speed has a lower first, and higher OD gears, but hearing it and seeing it can sometimes be much different.

nards444 Senior Enthusiast

nards444

Posted
Posted

Anyone know where I might find the different gear ratios of the 6 and 8 speeds? I keep hearing it mentioned that the 8 speed has a lower first, and higher OD gears, but hearing it and seeing it can sometimes be much different.

me too. I stll think a 6.2l with 3.23 is well yeah. Its not like were talking a diesel with 7-800 torque here either.

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