Author Topic: '06 Buick Lucerne transmission issue  (Read 8569 times)

Offline Irish_Alley

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Re: '06 Buick Lucerne transmission issue
« Reply #15 on: July 13, 2016, 09:54:05 AM »
http://www.tripleedgeperformance.com/TCC-rpm-oscillation.html
this will also help you out on your travels
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Online VileZambonie

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Re: '06 Buick Lucerne transmission issue
« Reply #16 on: July 13, 2016, 01:55:52 PM »
Did you check the brake switch as BD recommended? Inspect the fluid and condition and service the trans. Flushes are okay if done correctly with a quality product like BG. A cleaning agent is added and then 16 qts is flushed through the system. A modifier and conditioner is added and it can help with tcc apply, sticking valves and solenoids. Flushing is bad if a) the unit is already toast and or b) if done incorrectly.
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Offline Irish_Alley

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Offline zieg85

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Re: '06 Buick Lucerne transmission issue
« Reply #18 on: July 13, 2016, 03:19:36 PM »
Did you check the brake switch as BD recommended? Inspect the fluid and condition and service the trans. Flushes are okay if done correctly with a quality product like BG. A cleaning agent is added and then 16 qts is flushed through the system. A modifier and conditioner is added and it can help with tcc apply, sticking valves and solenoids. Flushing is bad if a) the unit is already toast and or b) if done incorrectly.

Will check brake switch ASAP.  The car is with my wife 300 miles from me until Saturday.  I asked her to try that the next time she can set the cruise and see if it still happens.  She just had it emission tested about 1/2 hour ago.  I will report my findings
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline hatzie

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Re: '06 Buick Lucerne transmission issue
« Reply #19 on: August 25, 2016, 06:53:47 PM »
Did you check the brake switch as BD recommended? Inspect the fluid and condition and service the trans. Flushes are okay if done correctly with a quality product like BG. A cleaning agent is added and then 16 qts is flushed through the system. A modifier and conditioner is added and it can help with tcc apply, sticking valves and solenoids. Flushing is bad if a) the unit is already toast and or b) if done incorrectly.

DO NOT flush the 4T65E with anything other than Dexron VI. These are not TurboHydramatic or 4L60 4L80 slushboxes and they will get real snotty about anything other than Dexron VI tranny fluid and one or two tested and trusted additives.  Ask Dave at TEP what Lucas additive formula he recommends...  I believe it's Lucas Transmission Fix.
Thread on Dexron VI and why we do not flush the 4T65E from the LS4 boards... http://www.gmls4.com/index.php?topic=604.0

Iron poisoned PCS and TCC solenoids can cause what you describe.  You have to drop the LH side of the cradle to get to em because they are under the LH side cover. There's a YouTube series where a guy does em on a GEN VII Impala. I posted them in this thread on the impalaforums. http://www.impalaforums.com/8th-gen-drivetrain/1129345-tranny-no-reverse-or-drive-2x-2.html
A shift kit along with the magnet upgrade per TSB 08-07-30-040 may help. Scroll down to my post in this Impala forums thread for the TSB http://www.impalaforums.com/chevy-impala-8th-gen-discussion/484562-2010-impala-lt-weird-transmission-shifts.html#post1212329
 More on the 4T65E on ls1tech
http://ls1tech.com/forums/ls4-performance/1362861-4t65e-hd-delayed-engagement-fix.html

Dexron VI (with Lucas Transmission Fix only if you need it), a deeper pan with lowered strainer so she doesn't starve under heavy acceleration, a real Magnefine filter in the cooler return line, and the updated magnets are the recipie for 4T65E longevity.  Maybe a 9C1 or TEP transmission cooler.

The only rebuilder worth bothering with on the 4T65E is Dave at TEP you will not be sorry you used him.  GM rebuilds are usually only good for around 25-30k if that.
Obviously get a new converter, flush the cooler and lines thoroughly, and blow em completely dry before hooking them to your pristine new slushbox.



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« Last Edit: August 26, 2016, 01:08:08 PM by hatzie »
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Offline zieg85

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Re: '06 Buick Lucerne transmission issue
« Reply #20 on: August 25, 2016, 07:00:45 PM »
thank you
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline hatzie

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Re: '06 Buick Lucerne transmission issue
« Reply #21 on: August 25, 2016, 07:39:34 PM »
thank you
No problem. 
You shoulda gotten the Lucerne Super with the baby NorthStar. They came with 4T80 transmissions that GM should've used in the W body Lacrosse, GXP Grand Prix, and Impala SS with the LS4 5.3.

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Offline zieg85

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Re: '06 Buick Lucerne transmission issue
« Reply #22 on: August 25, 2016, 07:46:59 PM »
thank you
No problem. 
You shoulda gotten the Lucerne Super with the baby NorthStar. They came with 4T80 transmissions that GM should've used in the W body Lacrosse, GXP Grand Prix, and Impala SS with the LS4 5.3.

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It was the one my wife wanted, NorthStar's was far and few between plus I was warned against getting one
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline hatzie

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Re: '06 Buick Lucerne transmission issue
« Reply #23 on: August 25, 2016, 07:58:20 PM »
thank you
No problem. 
You shoulda gotten the Lucerne Super with the baby NorthStar. They came with 4T80 transmissions that GM should've used in the W body Lacrosse, GXP Grand Prix, and Impala SS with the LS4 5.3.

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It was the one my wife wanted, NorthStar's was far and few between plus I was warned against getting one
Just kidding about the Northstar.  Both the big and little Buick Supers are pretty rare.  The LS4 Pontiac GXP and Impala SS are easier to find.  I know a guy that collected all four...  shaking my head. 


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Offline zieg85

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Re: '06 Buick Lucerne transmission issue
« Reply #24 on: April 09, 2018, 03:39:04 PM »
My brother in law used his scan tool and it only reached 67% lock up before it unlocked.  The brake wasn't being applied and all other functions seemed normal.  You could watch the slippage number get down to about 10 while the lockup was nearing its top of 67-68% before it unlocked and the rpms went up a few hundred rpms. 
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline zieg85

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Re: '06 Buick Lucerne transmission issue
« Reply #25 on: April 10, 2018, 12:31:58 PM »
o-ring comes with the $50 part so no brainer.  11 hour book rate may result me living with the problem.  Sounds like a big job, definitely bigger than I care to get into...
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/