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Discussion Starter · #1 ·
Hello. It’s uncommon for me to post in forums, but I’ll do my best to detail the issue that I’m having.

I have an 08 Impala SS with about 147,000 miles on it. I bought it with 138,000. It had a slight lunge when shifting from the moment I bought it, but it wasn’t awful. As time went on it did get a little worse tho. So about 3 months ago I put a bottle of Lucas Transmission fix in it. That seemed to help it a bit. The lunging wasn’t as bad. Fast forward to last week. I get in my car and drive to the first stop sign by my house. I come to a complete stop. Then when I attempt to accelerate it moves about 5 ft then I hear a loud CLUNK sound and my car won’t accelerate. I coast it to the side of the road and start testing the gears. R is still working. D and 3 are not working. However I was still able to put it in 1 or 2. The engine will rev up a bit then start to move and once the car gets up to about 15-20mph gear 3 and D come back and the car feels practically normal.


At this point I decide to get a decent code reader to see what might be the issue (praying to God the tranny didn’t drop) Upon plugging the reader in these are the codes I get P0711, P0722, P0723, P0741 TCC stuck off, P0751, P0752, P0756, P0757, P0843, and P0973. I know it’s a lot. These codes all seem to correlate to solenoids being stuck off or on, high trans fluid temps, and high or low solenoid voltage.

Doing research on the internet I find that these are common codes with this car and that what fixed the issue for a lot of people are a combination of replacing bad solenoids. Installing a shift kit and/or installing a tranny cooler. I don’t really have the tools or equipment to pull off a job like this so I took the car to a local transmission “specialist”.

I drove the car there because besides the fact it revs in first gear before moving, once it’s up to speed it drives fine. Anyway the mechanic tells me they will flush the system. Replace the fluid and filter and run diagnostics. Then any repair beyond that will be discussed after. About 2 hours after I drop my car off they call me and inform me that my car shifts “bad” and that I need the tranny rebuilt starting at $2,500.
He told me that I have too much metal built up and that the solenoids are clogged. He said I have a broken band that’s why it revs in first gear before driving normally. He also said I have a leak yet my trans fluid is and has always been full. I’ve never seen any indication of a leak. Basically he told me the car is f***ed and that I need to pay roughly 3 grand to fix it. I explained what I had learned about the solenoids and that I know what codes it’s throwing. He said replacing those would be putting a bandaid on the issue.

The reason I decided to take to this forum is because I can’t help but feel like I’m being scammed. Should I tell him to replace the solenoids, should I get second opinion, what do you guys think? I’d really appreciate any insight you guys may have because I really don’t know where to go from here.
 

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Discussion Starter · #3 ·
Thank you Bill, that was super helpful. Looks like I might be out 2,500 bucks 😣 Curse Chevy for putting such a junk transmission into an SS
 

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The 4t65e was introduced in 1997 in cars (Monte Carlo) with 160 HP. Your SS has about 90% more horse power, the trans is your weak link.
 

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That clunk you felt when you first bought the car ought to have been brought to your attention as a latent defect.
You bought somebody else's troubles. That's a crying shame.
You're the guy between the rock and hard place, now, ... deciding what to do in a spot like this ain't easy.
If the motor is very, very good; consider keeping it for later.

The bad news is that tranny's F.U.B.A.R. (Money Pit!!!)

To get back, ... on-the-road ... you need a 'Plug & Play' driveline to drop-in that baby.
Find yourself a whole used engine/trans after shopping for the best deal with some warranty.
If you cannot get anyone offering a whole Eng/Transaxle to spot you at LEAST 30-days; WALK!
If you're up a tree w/o wheels for work or school and really need to get rolling; find a drop-in!
But don't buy one from anybody unless they'll stand behind it for 30 days minimum.
30 Days from the time it's in and buttoned-up with you on the way right-over to mark his calendar and commence the warranty period.

Save time!!!
Especially, ... LABOR!
Pulling one complete engine & trans and planting the one found to replace it will save you many hours of labor.
 
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This is so like General Motors, anyone remember the THM200R4? Stamped metal hubs and gamble on the odds people won't push them hard. Thought they would have learned something from the 4T440 a generation before.
 

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Thank you Bill, that was super helpful. Looks like I might be out 2,500 bucks 😣 Curse Chevy for putting such a junk transmission into an SS
no offense if it was me ,id buy a new transmission or if you rebuild it ,have a shift kit installed also
 
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