LS4 Performance - Is this transmission slipping or normal? (video inside)




Slow94Formula
04-26-2010, 08:09 PM
Is this normal? I think it is slipping when it goes into 4th around :24 into the video if you watch the tach. The trans temp is right up around 200* when it is warmed up. Thanks for watching and helping out. I was at about 1/4 when I ran the first time onto the highway, and the second time I was a little bit softer on the gas and it didn't slip at all like it did the first time. I am expecting that it is slipping. Sorry about all of the wind noise, I forgot I left the window down when I was taping

http://www.youtube.com/watch?v=R7BmvcfnaQ4


JP_GXP
04-26-2010, 08:41 PM
You'll know if it's slipping. First symptoms are like pulses while cruising, jumping 100 rpms. Then shifts will take a little longer. And finally, it will be very obvious it is slipping when you go WOT and the car barely moves and the tach is pegged, lol.

Slow94Formula
04-26-2010, 08:44 PM
So, that is not a slip, and it is normal? I just wanted to know. So far this car has impressed me in its handling capabilities especially! This thing rocks! It runs right beside, dead even, no movement, to my 02 GTP with a 3.4 setup, headers, and a tune. I kind of expected it to be a little faster though.


JP_GXP
04-26-2010, 08:47 PM
Looks fine to me, glad you're liking it. Did you track the GTP?

Slow94Formula
04-26-2010, 09:00 PM
Before I bought the car it was taken to the track and it ran a 14.2@99.4. The launch was really slow, like a 2.5-2.6 60'. That car has a lot more pull after about 90, which is where my mom raced me to before we shut it down. I think the GTP (with good tires) has the potential to run a 13.99, but I probably will not ever find out because it is just a DD. Another thing that I think affected the race (in favor of the GXP) is that I got stuck in 2nd when we took off at about a 35 mph roll, The GTP won't shift into 1st unless you are going 29 mph or less

Slow94Formula
04-26-2010, 09:03 PM
The trans temp is supposed to be right around 190*-200* right?

JP_GXP
04-26-2010, 09:20 PM
GXPs trap 98-100 stock, sounds about right. Also, racing + mom = awesome, imo.

203 is a little high for 60 ambient temp. Were you driving it hard at all before hand?

Slow94Formula
04-26-2010, 09:23 PM
No, I was being nice to it. I actually was getting on the gas a little harder in the video than when I was driving it on the way home, just to get it to shift like that. If I keep my foot out of it and only accelerate with about 1/8 throttle then it doesn't shift like that, but if I am just about at 1/4 throttle it shifts like that when it is going into 4th. Then at a little bit heavier throttle than 1/4 at 1:17 in the video it shifts crisp. It seems to be just at that throttle position when it shifts like that.

JP_GXP
04-26-2010, 09:31 PM
With easy driving the trans temp should be more around 160-170, I think. It's 80 here and the temps were 200, of course that was with the slipping. Was about the same last year, though. I drive mine a little hard, too.

Slow94Formula
04-26-2010, 09:33 PM
So, being that it is running a little warmer than it should, would a fluid and filter change fix that?

JP_GXP
04-26-2010, 09:35 PM
Possibly, I'm sure someone will chime in and confirm or not. How many miles are on it?

Slow94Formula
04-26-2010, 09:37 PM
It's an '07 with 62,500 miles.

JP_GXP
04-26-2010, 09:39 PM
Could probably use a change. I changed my fluid, in my 08, at 37,000 miles and it was very dirty.

Slow94Formula
04-26-2010, 10:56 PM
I just took it down the highway a little ways to let it get warmed up and when I got back home it was at 190*. I thought it was warmed up pretty good, but there may have been more heat that would have come out if I had driven farther. It is 54* outside right now.

JDMC5
04-26-2010, 11:12 PM
I didn't see anything abnormal.

06 SS
04-27-2010, 05:03 AM
It looks fine, my SS will jump like that when the converter unlocks (like when the DoD swaps)

monte_with_a_LS4
04-27-2010, 05:09 AM
It looks fine, my SS will jump like that when the converter unlocks (like when the DoD swaps)

yea so does mine.


and also do the monte carlos have that trans temp on our dash? i dont remember having one

LS1 Racing
04-27-2010, 12:41 PM
You'll know if it's slipping. First symptoms are like pulses while cruising, jumping 100 rpms. Then shifts will take a little longer. And finally, it will be very obvious it is slipping when you go WOT and the car barely moves and the tach is pegged, lol.

We have the first dual-mode trannies in automotive history: Once these symptoms start, our transmissions turn into CVTs!!

Mgpeagle
04-27-2010, 04:10 PM
Change the fluid and see if that helps. If not, I suspect a t.c. going bad. Happens to many of us on here...

-Mikw

monte_with_a_LS4
04-27-2010, 07:19 PM
yea so does mine.


and also do the monte carlos have that trans temp on our dash? i dont remember having one

i was talking about a digital one here btw

TheMonteMan
04-27-2010, 11:48 PM
i pretty sure they dont. if they do someone let me know how to find it.

Slow94Formula
04-28-2010, 12:07 AM
Change the fluid and see if that helps. If not, I suspect a t.c. going bad. Happens to many of us on here...

-Mikw

So, you think it could be going bad? That would be part of the warranty, correct? Does anyone else agree with this? I will get the fluid changed here within a couple of weeks, but I want to drive it for a little bit first to make sure that I don't notice any other changes.

Red03GT
04-28-2010, 01:43 AM
I didn't see anything abnormal. Just looked like the converter locked which dropped the RPM's once it grabbed fourth and you were still on the throttle. Once you let off the gas and coasted it seems the converter unlocked hence the RPM's jumping back up.

Mgpeagle
04-28-2010, 07:25 AM
If you still have a warranty the t.c. will be covered if it goes bad. I am not saying it is bad but just to keep an eye on it. I have had 2 bad ones so far...

-Mike

Slow94Formula
04-28-2010, 10:15 AM
Sorry for the confusion on my part, but I just want to get this straight. At about 21-26 seconds into the video when it shifts it kind of jumps, and then shifts into 4th. The same transmission is in my GTP right? And it doesn't shift like that, so that is mostly why I think there is something wrong. I guess it does have quite enough warranty left to just not worry about it for now.