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3:08s With 6 Speed

hotrdlx

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hotrdlx Enthusiast

hotrdlx

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Been looking at new trucks and found several with 3:08 gears, really wanting 3:42s but havent driven a 3:08 truck yet. My question is for those who have them how do they drive. I have 3:42s with the 4sp now that im comparing too but i drove a 3:42 6 speed and didnt notice much difference on the test drive between the 4 and 6sp.

hockeypro1411 Senior Enthusiast

hockeypro1411

Posted
Posted
Been looking at new trucks and found several with 3:08 gears, really wanting 3:42s but havent driven a 3:08 truck yet. My question is for those who have them how do they drive. I have 3:42s with the 4sp now that im comparing too but i drove a 3:42 6 speed and didnt notice much difference on the test drive between the 4 and 6sp.

 

You must not have been trying very hard.

hotrdlx Enthusiast

hotrdlx

Posted
  • Author
Posted
Been looking at new trucks and found several with 3:08 gears, really wanting 3:42s but havent driven a 3:08 truck yet. My question is for those who have them how do they drive. I have 3:42s with the 4sp now that im comparing too but i drove a 3:42 6 speed and didnt notice much difference on the test drive between the 4 and 6sp.

 

You must not have been trying very hard.

 

No i didnt get a chance to get on it, traffic was pretty bad.

keith_mc88 Enthusiast

keith_mc88

Posted
Posted

Love mine! More specifically doing 120 -130 kph and not breaking 2000 RPM :cheers: I towed a tilt-and-load with 2 4x4s on it and it did a great job too.

 

It really depends on what you are looking for. I was looking for better fuel economy.

hotrdlx Enthusiast

hotrdlx

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  • Author
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Love mine! More specifically doing 120 -130 kph and not breaking 2000 RPM :cheers: I towed a tilt-and-load with 2 4x4s on it and it did a great job too.

 

It really depends on what you are looking for. I was looking for better fuel economy.

 

What kinda gas mileage are you getting? I typically get 16 around town with 3:42s and 4speed. Guess ill have to go test drive it tomorrow and decide which i like better.

gmercury Enthusiast

gmercury

Posted
Posted

Mine is great. I love it! Was a bit unsure when I bought it but I would take it over my 5.3 w/ 3.73 4 spd. It's great for cruising and I don't tow anything so I think it's a great combo for a daily driver.

yukon25008.1 Senior Enthusiast

yukon25008.1

Posted
Posted

i have a 4sp with 4:10,s and love it.. had 4spd,s with 3:73 and it was great also but i can tell you i wouldnt want any less than that, my personal opinion is with a 6sp it should have 4:56,s

I just cant imagine having 3:42 or 3:08 with 2 extra gears, there must be 0 low end pull or acceleration.

I guess if your just driving to work or getting groceries it would be fine..

if you drove a truck with 3:08,s and drove the same truck with 4:10,s it would feel like you tuned it or adding anything for that matter.

Z45 Senior Enthusiast

Z45

Posted
Posted

I did not want a 3.08 axle and I looked for a month to find a truck I could accept with a 3.42, since a 3.73 is unavailable anymore unless you order the max trailering option.

 

So far in the first 2000 miles my mileage has not gone below 18mpg, it been hovering around the 18.3 to 18.5 mark and the longest ride has been 200 miles, mostly it around town mileage but where I live I can count traffic signals on one hand so not as much stop and go.

fraiolib Enthusiast

fraiolib

Posted
Posted

compleatly depends on what you mostly do. just commuting back and forth to work the 3:08 are great if you tow all the time your you would prefer a different gear but the 3:08s do pull pretty good. ive got the 3:08 and i dont tow anything often so it works out good

music Senior Enthusiast

music

Posted
Posted

Depends on how much you tow/haul (or race?). For towing, I'd say that up to ~5k lbs, the 3.08 is going to feel good. Much higher, and the 3.42 is going to accelerate and pull hills stronger. Personally, I tow a 7k lb camper w/ the 5.3/4-spd/3.73, and I'd be a little worried whether the 5.3/6-spd/3.42 could pull some hills I've been across at hwy speeds without dropping to 2nd (and screaming), so a 3.42 is the least I'd go for my needs.

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted

remember guys, the 6 speed has a deeper (taller) ratio for the 1st two gears:

Gear Ratios: for 6l80e

1st: 4.02

2nd: 2.36

3rd: 1.53

4th: 1.15

5th: 0.85

6th: 0.67

 

4L60E gear ratios:

1st 3.06,

2nd 1.75,

3rd 1.00,

4th 0.70.

 

first two gears really help launch and 6th helps with fuel economy

tunseeker1 Enthusiast

tunseeker1

Posted
Posted

have no problems pulling any trailers with the 3.08.

 

Just got back from Florida trip with a single car enclosed and had no problems going up and down on I-75 from ohio

bonedaddy Enthusiast

bonedaddy

Posted
Posted

If you combine the tranny ratio and final gear ratio then 4th and 5th in a 6spd/3.08 are pretty much the same total gearing as 3rd/4th in a 4sp/3.73.

Combined tranny/rear end ratio

 

4spd/3.73

1st 11.41

2nd 6.53

3rd 3.73

4th 2.61

 

6spd/3.08

1st 12.38

2nd 7.27

3rd 4.71

4th 3.54

5th 2.62

6th 2.06

 

6spd/3.42

1st 13.75

2nd 8.07

3rd 5.23

4th 3.93

5th 2.91

6th 2.29

 

 

Now if you are on a hill with a 4spd/3.73 where 3rd gear ain cuttin it you gotta drop all the way to 2nd with a total gearing of 6.53 which will probably be too much gear. Where as with both 6pds you can use 3rd or 4th which fall between 2nd and 3rd in the 4 speed.

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
If you combine the tranny ratio and final gear ratio then 4th and 5th in a 6spd/3.08 are pretty much the same total gearing as 3rd/4th in a 4sp/3.73.

Combined tranny/rear end ratio

 

4spd/3.73

1st 11.41

2nd 6.53

3rd 3.73

4th 2.61

 

6spd/3.08

1st 12.38

2nd 7.27

3rd 4.71

4th 3.54

5th 2.62

6th 2.06

 

6spd/3.42

1st 13.75

2nd 8.07

3rd 5.23

4th 3.93

5th 2.91

6th 2.29

 

 

Now if you are on a hill with a 4spd/3.73 where 3rd gear ain cuttin it you gotta drop all the way to 2nd with a total gearing of 6.53 which will probably be too much gear. Where as with both 6pds you can use 3rd or 4th which fall between 2nd and 3rd in the 4 speed.

 

 

ah, didnt do the calculations with the 3.08 rear end....

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