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8th Gen Drivetrain Transmissions, clutches, and axles.

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post #1 of (permalink) Old 03-23-2017, 09:01 PM Thread Starter
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6-speed

is there anyway or anyone out the 6-speed trans in the 8th gen impala like 06-11 ? i have 2008 impala 3.9l i would like to have 6-speed with the 3.9l

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post #2 of (permalink) Old 03-24-2017, 01:12 PM
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Originally Posted by 08cngimpala View Post
is there anyway or anyone out the 6-speed trans in the 8th gen impala like 06-11 ? i have 2008 impala 3.9l i would like to have 6-speed with the 3.9l
will never happen. There are no 3.9L/6a application on any gm cars or suv's. I wish my 06 3.9L had a 6a when I had it.
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post #3 of (permalink) Old 03-24-2017, 02:39 PM
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I wouldn't wish for the 6-speed too much... Sure, it's more reliable, but I actually prefer the 4-speeds myself - they just shift smoother and I feel that the 6-speed is constantly shifting... i'm not a fan of the 6-speed shift "feel" at all. It's very inconsistent too - sometimes it shifts great and other times the shifts suck. very "hit or miss"...

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post #4 of (permalink) Old 03-24-2017, 08:20 PM
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Originally Posted by jtrosky View Post
I wouldn't wish for the 6-speed too much... Sure, it's more reliable, but I actually prefer the 4-speeds myself - they just shift smoother and I feel that the 6-speed is constantly shifting... i'm not a fan of the 6-speed shift "feel" at all. It's very inconsistent too - sometimes it shifts great and other times the shifts suck. very "hit or miss"...

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lol you wouldn't be so amused with my 1-2 shift....i'm getting an overkill tune to try and correct the issue a bit....think i jumped on it off the line too many times and it programmed itself to look for a quick start and when you take it easy on it it seems to have a funky shift like it was expecting a higher rpm than it received. wasn't so bad until i started strictly city driving due to moving to the city. out in the country it's not so noticeable.
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post #5 of (permalink) Old 03-25-2017, 05:55 AM
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Originally Posted by Joes74challenger View Post
think i jumped on it off the line too many times and it programmed itself to look for a quick start
Does it do that? Do 8th gen Impalas "learn" a shift pattern according to your driving style over time?
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post #6 of (permalink) Old 03-25-2017, 02:31 PM
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Not done anything in the way of mods on our car, not really had any issues with inconsistent or hard/soft shifts that I see some others mention.
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post #7 of (permalink) Old 03-25-2017, 03:11 PM
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Originally Posted by 12 lt View Post
Not done anything in the way of mods on our car, not really had any issues with inconsistent or hard/soft shifts that I see some others mention.
I'm curious - what kind of cars did you have before the Impala? This is my first 6 speed - I've always owned 4-speed GM's before it. i just find the 6 speed trans kind of annoying. One day, the shifts are nice and smooth and the next day, they're very "noticeable". Others have reported the same thing with the GM 6 speeds - very "inconsistent"... Just curious what you drove before the Impala.

I'd still probably choose the 6-speed over the older 4-speeds overall because they are much more reliable, but I still prefer the way the 4-speeds shift (and the fact that they shift less).

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post #8 of (permalink) Old 03-25-2017, 04:10 PM
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Originally Posted by jtrosky View Post
I'm curious - what kind of cars did you have before the Impala? This is my first 6 speed - I've always owned 4-speed GM's before it. i just find the 6 speed trans kind of annoying. One day, the shifts are nice and smooth and the next day, they're very "noticeable". Others have reported the same thing with the GM 6 speeds - very "inconsistent"... Just curious what you drove before the Impala.

I'd still probably choose the 6-speed over the older 4-speeds overall because they are much more reliable, but I still prefer the way the 4-speeds shift (and the fact that they shift less).

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LOL. I have driven a lot of different vehicles mostly gm and dodge. Only ford I had much time with was a 4 spd manual coupled with a 302 in a mustang I had. Most the vehicles I had in the 80's and early 90's were manuals. Most have been gm's however most have been trucks so the impala to me is pretty smooth. The impala is the first car I have owned that was front wheel drive, although I had driven plenty of others over the years.

I drove the car more when it was new, and I have gotten on it from 0-60+ more than just a few times. My wife drives it much more than me now since she started driving all over the state for her work and it is much better on fuel than our awd durango and our 3/4 ton 4 wd truck. I really like that she is averaging 27+ mpg after I tuned it up. Car has over 116,000 miles on it now. Our 08 durango has a 5 speed behind the 5.7 hemi.

Guess I may not be a good judge on cars shifting performance since more of my driving has been driving trucks or suv's.
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post #9 of (permalink) Old 03-25-2017, 05:09 PM
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Quote:
Originally Posted by jtrosky View Post
I'm curious - what kind of cars did you have before the Impala? This is my first 6 speed - I've always owned 4-speed GM's before it. i just find the 6 speed trans kind of annoying. One day, the shifts are nice and smooth and the next day, they're very "noticeable". Others have reported the same thing with the GM 6 speeds - very "inconsistent"... Just curious what you drove before the Impala.

I'd still probably choose the 6-speed over the older 4-speeds overall because they are much more reliable, but I still prefer the way the 4-speeds shift (and the fact that they shift less).

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Don't know how I forgot, my first gm car was a pontiac phoenix fwd I bought back around 1985.
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post #10 of (permalink) Old 03-26-2017, 09:27 AM
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They may actually bolt together, I've never seen anybody try, but the reason that nobody tries is that they are very electronically controlled, and due to that, it's sort of an impossibility for the average person to incorporate all that is needed to control the shifts.

The days of trannys just going thru the gears by themselves are long over.
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post #11 of (permalink) Old 03-26-2017, 09:38 AM
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Agree with Carbide.

The ECM the TCM and the BCM all need to talk to each other and if one is speaking a different language I don't think any of them will work at all.

Some things are better left unsaid, which I generally realize right after I have said them.
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post #12 of (permalink) Old 04-04-2017, 08:01 AM
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Originally Posted by 08cngimpala View Post
is there anyway or anyone out the 6-speed trans in the 8th gen impala like 06-11 ? i have 2008 impala 3.9l i would like to have 6-speed with the 3.9l

The 4-speed 4t65-e trannies are generally good transmissions, but have many potential failure points. The 4 solenoids can be changed, magnets can be added, valve body can be upgraded, Transgo shift kit, Dexron VI fluid and filter change and an Overkill ECM/TCM tune and your transmission will shift amazingly. The transmission is the last thing I have to upgrade on my 3.9L. Thankfully, it has lasted 11 years and counting so far, but I do have occasional hard shifts. I think the 3.9L and 5.3L have the HD version, but not 100% sure.

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post #13 of (permalink) Old 04-10-2017, 12:04 PM
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Quote:
Originally Posted by jtrosky View Post
I'm curious - what kind of cars did you have before the Impala? This is my first 6 speed - I've always owned 4-speed GM's before it. i just find the 6 speed trans kind of annoying. One day, the shifts are nice and smooth and the next day, they're very "noticeable". Others have reported the same thing with the GM 6 speeds - very "inconsistent"... Just curious what you drove before the Impala.

I'd still probably choose the 6-speed over the older 4-speeds overall because they are much more reliable, but I still prefer the way the 4-speeds shift (and the fact that they shift less).

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I find the shifting in my '13 LTZ to be fairly consistent, but not as crisp and on point as my '02 with TransGo kit and Overkill tune. Compared to the 4 speed the 6 speed seems to "know what I want" much better - up hills it'll stay in a lower gear longer rather than searching for a higher gear as soon as possible. What surprised me one day I was going down a fairly long steep hill (highway 18 towards I90 near Seattle), and it downshifted and stayed there to keep the RPM up and facilitate engine breaking which I thought was amazing, wasnt intil I got to the bottom and applied accelerator that it changed back to a higher gear. With the old 4 speed I'd manually shift it into 3rd in same situation.

As for excessive shifting in the 6 speed, only time I notice it is if I get on the accelerator in 6th or 5th depending on speed, it'll down shift to two gears one after the other. Since I dont have too much lead in my shoes it doesnt happen a lot :-)

What bugs me is the weird electronic throttle response in the newer car!
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post #14 of (permalink) Old 04-10-2017, 12:33 PM
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Originally Posted by Dave_N View Post
I think the 3.9L and 5.3L have the HD version, but not 100% sure.
Close, lol. Just the SS gets the 4T-65E-HD. Everybody else gets plain jane.
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