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LS4 Transmission Problem Thread (4T65-HD); Current Total Inside
#441
Ditto
My '07 SS tranny went about a month ago, 92K, never a problem ever before. Still drives when it hasn't warmed up, but when it does, there's nothing. I shut it off for a while a few miles from home and when I restarted I was able to limp back home and up my driveway. Going to take it out this weekend, it's finally warm here.
#442
Staging Lane
Join Date: Apr 2009
Location: Columbus, Ohio
Posts: 96
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My trans from a stop feels like its starting out in 2nd then after pulling for a few seconds feels like it downshifts into first. almost a rev and clunk but its pulling forward the whole time.
#444
Staging Lane
Join Date: Oct 2011
Location: Lawton / Fort Sill OK
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#445
My 2008 gxp has over 78 thousand miles on it.I have owned it for two months have no recordable issues with it.
#446
2009 Impala SS
Recently my SS Impala has been not shifting into 1st gear when stopped.
At take off it will start out in 2nd then a abruptly shift down to 1st resulting in a harsh "thump" I recently had a BG flush done on the tranny and the fluid is new and full. When shifting manually it works fine. I have been told it is a sticky shift valve and to just drive through it for a while and it will work it self out. I don't buy that. Have any of you had this issue? What else should I look for? How about an additional additive? Prior to the flush it was starting to do this and why I decided to do the flush.
Also it dosent do this all the time. I would say about 6 out of 10 starts it will happen. when going down the road all is well. shifts smooth, down shifts smooth when passing.
Thanks for your time.
Bill
At take off it will start out in 2nd then a abruptly shift down to 1st resulting in a harsh "thump" I recently had a BG flush done on the tranny and the fluid is new and full. When shifting manually it works fine. I have been told it is a sticky shift valve and to just drive through it for a while and it will work it self out. I don't buy that. Have any of you had this issue? What else should I look for? How about an additional additive? Prior to the flush it was starting to do this and why I decided to do the flush.
Also it dosent do this all the time. I would say about 6 out of 10 starts it will happen. when going down the road all is well. shifts smooth, down shifts smooth when passing.
Thanks for your time.
Bill
#447
TECH Fanatic
Recently my SS Impala has been not shifting into 1st gear when stopped.
At take off it will start out in 2nd then a abruptly shift down to 1st resulting in a harsh "thump" I recently had a BG flush done on the tranny and the fluid is new and full. When shifting manually it works fine. I have been told it is a sticky shift valve and to just drive through it for a while and it will work it self out. I don't buy that. Have any of you had this issue? What else should I look for? How about an additional additive? Prior to the flush it was starting to do this and why I decided to do the flush.
Also it dosent do this all the time. I would say about 6 out of 10 starts it will happen. when going down the road all is well. shifts smooth, down shifts smooth when passing.
Thanks for your time.
Bill
At take off it will start out in 2nd then a abruptly shift down to 1st resulting in a harsh "thump" I recently had a BG flush done on the tranny and the fluid is new and full. When shifting manually it works fine. I have been told it is a sticky shift valve and to just drive through it for a while and it will work it self out. I don't buy that. Have any of you had this issue? What else should I look for? How about an additional additive? Prior to the flush it was starting to do this and why I decided to do the flush.
Also it dosent do this all the time. I would say about 6 out of 10 starts it will happen. when going down the road all is well. shifts smooth, down shifts smooth when passing.
Thanks for your time.
Bill
#448
official diagnosis of the failure of mine at 100k from the trans shop was burnt input clutches, actuator fit limit valve failure and snapped forward and reverse bands. Go figure.
#450
#451
ok, not sure if im at the right place, but here goes. 2008 impala ss. sometimes when I
stop at traffic light my trans drops out of gear, then when I press on the gas, it jumps into gear. only does it sometimes, mostly in the morning after about a mile and a half.
(first traffic light.) then its good for the day.any ideas? also cost to fix? thanks, wally.
stop at traffic light my trans drops out of gear, then when I press on the gas, it jumps into gear. only does it sometimes, mostly in the morning after about a mile and a half.
(first traffic light.) then its good for the day.any ideas? also cost to fix? thanks, wally.
#452
TECH Fanatic
ok, not sure if im at the right place, but here goes. 2008 impala ss. sometimes when I
stop at traffic light my trans drops out of gear, then when I press on the gas, it jumps into gear. only does it sometimes, mostly in the morning after about a mile and a half.
(first traffic light.) then its good for the day.any ideas? also cost to fix? thanks, wally.
stop at traffic light my trans drops out of gear, then when I press on the gas, it jumps into gear. only does it sometimes, mostly in the morning after about a mile and a half.
(first traffic light.) then its good for the day.any ideas? also cost to fix? thanks, wally.
Its a common problem with the forward seal leaking, there is no fix until you have it rebuild , in the mean time use the shifter manually when starting out and put it in 1st, this will raise the line pressures to overcome the leak.
#453
I started to see the slippage at stops signs recently.
#454
Rebuilt @ 97,000
My trans had the typical issue of soft 1-2 shift and poor reverse engagement then the day it went out it was a "o" ring failure that bypassed all the pressure out the vent.
I did a performance upgrade with hardened shafts
Shift kit
External cooler
Mini high stall converter
Program updates from Baker Engineering
Now I have a problem with it randomly stalling from what seems to be the tcc not unlocking
I did a performance upgrade with hardened shafts
Shift kit
External cooler
Mini high stall converter
Program updates from Baker Engineering
Now I have a problem with it randomly stalling from what seems to be the tcc not unlocking
#455
Moderator
iTrader: (4)
My trans had the typical issue of soft 1-2 shift and poor reverse engagement then the day it went out it was a "o" ring failure that bypassed all the pressure out the vent.
I did a performance upgrade with hardened shafts
Shift kit
External cooler
Mini high stall converter
Program updates from Baker Engineering
Now I have a problem with it randomly stalling from what seems to be the tcc not unlocking
I did a performance upgrade with hardened shafts
Shift kit
External cooler
Mini high stall converter
Program updates from Baker Engineering
Now I have a problem with it randomly stalling from what seems to be the tcc not unlocking
#456
08 GP GXP bought in 2011 with 85k. Rebuilt trans. and new TC shortly after at 86k under 100k powertrain warranty. Now in 2016 with 112k, obviously not drove daily, slipping at lockup. Knew it was going to happen but not this soon. Time to find me a G8.
#458
Pretty much gone
#459
Slipping
This thread has moved to http://www.gmls4.com/index.php/topic,33.0.html , which is at GMLS4.com.
It will no longer be supported or updated on this site. Please visit the above link to report issues and obtain information regarding the transmission problems that are so common to the LS4 cars. You will also find resources there that will teach you what you need to know about addressing and preventing the problems from happening again.
It will no longer be supported or updated on this site. Please visit the above link to report issues and obtain information regarding the transmission problems that are so common to the LS4 cars. You will also find resources there that will teach you what you need to know about addressing and preventing the problems from happening again.
#460
time for a new transmission or rebuild..
these trannys are only good for around 90-100 thousand miles..
my 07 Monte Carlo AS is in the shop as we speak getting a new one.