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07 SS 5.3 Transmission Issues. What would you do?

2K views 7 replies 5 participants last post by  Impoor 
#1 ·
Morning!

My friend gave me his 2007 Impala 5.3L SS with 220k on the car for free. With ~80k on replaced engine and supposedly 3rd used transmission with maybe ~100k miles but he isn’t sure. He figured I’d have more time for the TLC and he didn’t need it anymore.

I don’t know how the car normally responds shifting wise and acceleration but it was driving okay to my house.

I did hear a whining/grinding noise from the transmission in park and it seems reverse needs a lot of gas and still slowly accelerates when in reverse.

I haven’t tried driving it since it is not reversing properly.

He told me it has the wrong gearing from a 4 cylinder possibly in the transmission, not sure how accurate that is.

check engine codes
P0700
P0741

Has clean transmission fluid and is right on the full line.

What would the next steps be to repair or replace transmission if I’m taking to a transmission specialist or mechanic?

Or if it’s simple enough to do myself.

I really don’t want to put any more than maybe $1500-2500 in this. And would that even be worth it considering the car has 220k miles on it.

What would you do?

Thanks!
 
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#5 ·
GM didn't put 4 cylinder engines in the 7th or 8th gen cars. You should have a 4T65E-HD behind the LS4 V8. If you have the lighter duty 4T65E transmission out of a V6 it will not like the V8 torque and it will not be geared properly either.

Whether it's worth fixing depends on where you live and whether it's a rust bucket with a trashed interior and covered in dents or it's in decent shape other than the transmission.
The LS4 V8 Impala SS and her sisters are getting less and less common as she marches rapidly toward the end of her 2nd decade on the road. If it's not a rusty turd it's probably worth fixing. Make sure you have the title in your name before you dive into it.
Decent examples of the LS4 V8 Pontiac Grand Prix GXP, Monte Carlo SS, Impala SS, and Buick Lacrosse Super are not going down in price.

The 2004 & 2005 Impala SS with the supercharged Series III 3800 V6 and the 1997-2003 Pontiac GTP and even some of the 1990's Buick models with the supercharged Series II 3800 have started climbing back up in price.

The 4.6L Northstar V8 Pontiac Bonneville GXP is fairly stable in price too. Eventually they'll go up but not as fast, as soon, or as high because of the engine reputation.
 
#7 ·
You'll have to drop the LH end of the engine cradle and pull the LH half shaft to access the valve body.
If you're down to the valve body replace both shift solenoids, Torque Converter Clutch solenoid, Pressure Control Solenoid, and Pressure switch manifold.

Here's the common problems page from TEP.
Triple Edge Performance

Slow/No reverse engagement is fairly straightforward.

Whining... I would check the accessory drive idlers, tensioner, alternator, and power steering pump.
If it's coming from the transmission take a look here.
 
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