seems like it is gaining about 250-300 rpm before it goes into overdrive at around 60 -65 mph
any ideas?
Apr 26, 2016, 01:29 PM
Last edit by: IB Advertising
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LS4 Transmission Problem Thread (4T65-HD); Current Total Inside
On The Tree
Joined: Apr 2011
Posts: 151
Likes: 0
From: Kenosha, WI
DOD mode?? use ur info panel to show the 8cyl or 4cyl mode, when it rpm jumps, it switches to 4cyl mode
Thread Starter
Joined: Aug 2002
Posts: 2,419
Likes: 6
From: 78°14′46″N 15°27′56″E
It could be any number of things, though I would lean towards a flare due to slippage, or possibly the TCC disengaging early at the 3-4 shift.
Hopefully, the dealer will have something to say.
TECH Enthusiast
Joined: May 2011
Posts: 518
Likes: 0
From: Iowa
got my monte back today. they told me to keep an eye on it and bring it back if it gets worse. The tranny isn't throwing a code so they think it is ok. so im just gonna drive it and keep track of what it is doing
Thread Starter
Joined: Aug 2002
Posts: 2,419
Likes: 6
From: 78°14′46″N 15°27′56″E
Added you to the list.
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Registered User
Joined: Jul 2011
Posts: 2
Likes: 0
From: Bradford, ON
My '06 Impala SS was rebuilt (?) for a shift solenoid last month. The symptom was slipping from take off, and occasionally with heavy acceleration if already moving. More noticable when taking off and turning left, but just before the work was done it was just about any launch from a stop. This took several trips to a couple of dealers to get them in the car and demonstrate before one of them finally acknowledged the problem. Funny how many complaints seem to be out there, but they all claim they haven't heard of any problems or complaints before me.
Now four weeks later the left turn slip and grind is starting again. Back to the dealer next week.
Now four weeks later the left turn slip and grind is starting again. Back to the dealer next week.
Thread Starter
Joined: Aug 2002
Posts: 2,419
Likes: 6
From: 78°14′46″N 15°27′56″E
My '06 Impala SS was rebuilt (?) for a shift solenoid last month. The symptom was slipping from take off, and occasionally with heavy acceleration if already moving. More noticable when taking off and turning left, but just before the work was done it was just about any launch from a stop. This took several trips to a couple of dealers to get them in the car and demonstrate before one of them finally acknowledged the problem. Funny how many complaints seem to be out there, but they all claim they haven't heard of any problems or complaints before me.
Now four weeks later the left turn slip and grind is starting again. Back to the dealer next week.
Now four weeks later the left turn slip and grind is starting again. Back to the dealer next week.
Sorry to hear about this. Hopefully, they put a replacement unit in it, but even then, it's likely you'll have problems in the future. Search this forum for solutions, and the way forward will become apparent.
Thread Starter
Joined: Aug 2002
Posts: 2,419
Likes: 6
From: 78°14′46″N 15°27′56″E
TECH Apprentice
Joined: Jul 2005
Posts: 360
Likes: 0
add me to the list... started happening 2 weeks ago thought it was just the brutal heat and humidity just giving the car issues. Nope 1st gear rev and bang here.
I have a 2007 gotta find out when the build date or sold date is to make sure its still under GM's 5/100K. I am going to be taking it to my friend who works at the local caddy dealer he said he would make sure its done right. But is all the tech bullitin stuff in this thread that I might want to jot down for him to make sure if its somethign he cant "reproduce" to verify it that the paper can say there is issues...
watch now that I typed this out..its going to totally lose 1st gear..
when I baby it, and let it walk out of a stop its fine. But if I give it gas right from brake..thats when it does it..sound right?
I have a 2007 gotta find out when the build date or sold date is to make sure its still under GM's 5/100K. I am going to be taking it to my friend who works at the local caddy dealer he said he would make sure its done right. But is all the tech bullitin stuff in this thread that I might want to jot down for him to make sure if its somethign he cant "reproduce" to verify it that the paper can say there is issues...
watch now that I typed this out..its going to totally lose 1st gear..
when I baby it, and let it walk out of a stop its fine. But if I give it gas right from brake..thats when it does it..sound right?
Thread Starter
Joined: Aug 2002
Posts: 2,419
Likes: 6
From: 78°14′46″N 15°27′56″E
add me to the list... started happening 2 weeks ago thought it was just the brutal heat and humidity just giving the car issues. Nope 1st gear rev and bang here.
I have a 2007 gotta find out when the build date or sold date is to make sure its still under GM's 5/100K. I am going to be taking it to my friend who works at the local caddy dealer he said he would make sure its done right. But is all the tech bullitin stuff in this thread that I might want to jot down for him to make sure if its somethign he cant "reproduce" to verify it that the paper can say there is issues...
watch now that I typed this out..its going to totally lose 1st gear..
when I baby it, and let it walk out of a stop its fine. But if I give it gas right from brake..thats when it does it..sound right?
I have a 2007 gotta find out when the build date or sold date is to make sure its still under GM's 5/100K. I am going to be taking it to my friend who works at the local caddy dealer he said he would make sure its done right. But is all the tech bullitin stuff in this thread that I might want to jot down for him to make sure if its somethign he cant "reproduce" to verify it that the paper can say there is issues...
watch now that I typed this out..its going to totally lose 1st gear..
when I baby it, and let it walk out of a stop its fine. But if I give it gas right from brake..thats when it does it..sound right?
Car has been at the dealer a week with them trying to find anything wrong, and so far nothing. This is it's 3rd trip in and now my warranty will be up very soon. A friend of mine is good friends with a guy who does testing on new parts for sonnax. So I picked his brain a little and he gave me some very good info on our transmissions. So when I get the car back I'm going to be doing a few small upgrades to it, hopefully with the help and guidance from from the trans guy.
guess i should have asked him to start with. 
Registered User
Joined: Aug 2011
Posts: 1
Likes: 0
From: Nebraska
Tranny Probs 08 GP GXP At 80,000 With minimal warning tranny goes completely out ( No Engine Light). Dealer replaced with new tranny not rebuilt. Cause was Torque Converter in pieces. Now, at 104,000 Chirping sound from tranny and frequent but mild slips. But goes and engages into every gear fine. Just while driving steady is when i feel the miss or brief slip. Tranny again? Please tell me i'm wrong!
i got the car back from the dealer and there was no issue found again.So im guessing at this point its a wash because the warranty is just about up. I got the vehicle history on work performed from a friend who works at a dealer and it seems the trans was never serviced. So i bought a case of dex IV and a new GM filter last week. Im gonna just drop the pan and let it drain as much as i can out of it. While the pan is off, i am also going to put my ZZP finned aluminum pan off my ZZP trans (from my gtp) on the car. Its doing me no good sitting in my garage and can only help keep my temps down. I plan on doing a cooler on the car either end of this year or early next year. I'm hoping with a new filter, new fluid, and pan it will help lower the temps a little as it is routinely going above 205 in 75ish degree weather in stop and go traffic.