Well, I have a 2006 Hummer H3 Luxury Automatic with 70000 miles on it.
I started to notice that the shifting in 1-2 and 2-3 is a bit slow..like there is first a disengage of the previous gear and then the upshift occurs, the 1-2 is harsh and the 2-3 is not harsh.
I read a lot of transmission problem related to 4L60E and the strange thing is that during this the transmission doesnt slip at all, and in WOT the transmission shift good.
Is like the upshift is a bit hard to the transmission and not smooth, like in two parts first disengage and then engage.
The maintenance done to the transmission is a Automatic Transmission Fluid change when the Hummer had 55000 miles. But only change the fluid of the pan, filter and pan seal, not all the fluid (flush). When the mechanic and me drop the pan there are a lot of clutch debris according to him, and the fluid had a burnt odor..this Hummer one week of year is driving in the Sahara desert and in extreme conditions, but never overheat. In the pan there are nothing about metal debris. No transmission and engine codes too (Done with a TECH II)
Like I say before I investigate a lot of this problem relate to 4L60E problems, and I think about two possibilities:
-The fluid is bad..due to the fact that most of the fluid is still burnt fluid, and this can produce a change in pressure line that affect my shift quality
-Due to all the clutch debris and the transmission not be cleaned when the mechanic drop the pan, maybe the debris in inside the valve body affecting the correct operation. Related to clogged screen in EPC (Electronic Control Pressure) solenoid, or maybe the controls solenoids (1-2, 2-3...)
-Other problem that I can not diagnose yet..
What you guys think about it? Someone ever had this problem?
The transmission despite of this is working very well, and strong, the car is with us since the Hummer has 7000 miles on it so the maintenance done is only the fluid change.
Thanks you very much. Guerrero
I started to notice that the shifting in 1-2 and 2-3 is a bit slow..like there is first a disengage of the previous gear and then the upshift occurs, the 1-2 is harsh and the 2-3 is not harsh.
I read a lot of transmission problem related to 4L60E and the strange thing is that during this the transmission doesnt slip at all, and in WOT the transmission shift good.
Is like the upshift is a bit hard to the transmission and not smooth, like in two parts first disengage and then engage.
The maintenance done to the transmission is a Automatic Transmission Fluid change when the Hummer had 55000 miles. But only change the fluid of the pan, filter and pan seal, not all the fluid (flush). When the mechanic and me drop the pan there are a lot of clutch debris according to him, and the fluid had a burnt odor..this Hummer one week of year is driving in the Sahara desert and in extreme conditions, but never overheat. In the pan there are nothing about metal debris. No transmission and engine codes too (Done with a TECH II)
Like I say before I investigate a lot of this problem relate to 4L60E problems, and I think about two possibilities:
-The fluid is bad..due to the fact that most of the fluid is still burnt fluid, and this can produce a change in pressure line that affect my shift quality
-Due to all the clutch debris and the transmission not be cleaned when the mechanic drop the pan, maybe the debris in inside the valve body affecting the correct operation. Related to clogged screen in EPC (Electronic Control Pressure) solenoid, or maybe the controls solenoids (1-2, 2-3...)
-Other problem that I can not diagnose yet..
What you guys think about it? Someone ever had this problem?
The transmission despite of this is working very well, and strong, the car is with us since the Hummer has 7000 miles on it so the maintenance done is only the fluid change.
Thanks you very much. Guerrero
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