looking at ls4's
TECH Enthusiast
Joined: Apr 2007
Posts: 697
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From: Hudson River Valley, NY
I have had a number of issues with my car but that was when it was under warrenty over 30K ago. It has been very good since then which makes me think the dealer has been messing with the car on purpose. Through all of it, the constant has been the driveline that has been steadfast. I only had to replace the battery a few thousand miles ago. Try not to go to the dealer if you don't have to. I've drag raced the car and I will get on it from time to time and it does get stuck in traffic and the transmission doesnt seem to care, consistant, smooth shifts under low throttle and under moderate and high, a good tug. I like it very much actually. I like a smooth transmission but only if I can feel it shifting; tells me it is working. Driving these cars is very different from most because of the loose converter and electronic throttle, use the converter to accelerate yet hold the same engine speed, and use cruise for the electronic throttle and let the computer handle it all. BTW ever since I packed the steering shaft with synthetic chassis grease, done before my warrenty ended, the problem has been gone.
Last edited by Count of Monte Carlo; Oct 31, 2009 at 07:38 PM.
Launching!
Joined: Apr 2005
Posts: 283
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From: Springfield MO
I didnt like the way my tranny shifted so I just put the zzp shift kit in. Its cheap but it did exactly what i wanted, now i can feel the car shift with a light pop. I just rolled over 50k and have had very few minor problems. ISS, hubs.
I HATE having a looose converter on a daily driver. On a 1/4 mile car, it makes sense, but I hate the sloppy feel you get from a loose converter on the street.
Has anyone thought of going with a tighter converter? Are there even any options that will bolt to our cars? There has to be some improvement in feel and MPG by going this route.
Any thoughts on that?
TECH Enthusiast
Joined: Apr 2007
Posts: 697
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From: Hudson River Valley, NY
The only reason I can think they went with that converter was to purposly take some of the response out of the driveline and to aid in DOD engagment smoothness. But also we are running with a taller final drive so its not a bad performance move for torque multiplication and keeps the economy at cruise when locked. But I would like to also say that the percieved shift feel is a result of the converter being so loose as it absorbs the loading. In respect if you test drive our V6 counterparts you will feel the shifts more promianatly in with thier setup for which a 3500V6 comes with an awful 1200 stall I belive. I'd like ot think that maybe they put a more civil stall converter on a 3900 V6 car which, in theory, should be transferable.
Staging Lane
Joined: Jan 2009
Posts: 87
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From: Orange County, CA
Actually, not much at all, as I mainly use it to see business clients with lots of city driving. I have spent most of my tuning time on the transmission, getting the upshifts where I want them, and the downshifts where I need them. I wish there was a way to decrease the shift delay like you can on the G8 GTs (I've seen the programming in HP Tuners for those cars.)
The only reason I can think they went with that converter was to purposly take some of the response out of the driveline and to aid in DOD engagment smoothness. But also we are running with a taller final drive so its not a bad performance move for torque multiplication and keeps the economy at cruise when locked. But I would like to also say that the percieved shift feel is a result of the converter being so loose as it absorbs the loading. In respect if you test drive our V6 counterparts you will feel the shifts more promianatly in with thier setup for which a 3500V6 comes with an awful 1200 stall I belive. I'd like ot think that maybe they put a more civil stall converter on a 3900 V6 car which, in theory, should be transferable.
Any place I should be looking to verify fittment?
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Verdad Gallardo TECH Enthusiast
Joined: Apr 2007
Posts: 697
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From: Hudson River Valley, NY
Well all I know is that our converters are of a larger size...The 3800SC used this size as well....I cannot say for sure, but I never heard of the 3800s using a different flexplate with a larger converter. So I think it is just as simple as getting a converter from another car and installing it. I'd like to think the LS4 uses the 3 bolt flexplate mounting. I will venture to say that the pilot hole on the crank maybe bigger, which would mean th epilot on the converter would be bigger. V6 models have thier own size...with that said it might not be that easy afterall. Keep in mind our gearing is tall so a loose converter does help out in that regard...In theory...Honestly I think the LS4 wouldn't care if you had a 2:1 fdr or a 5:1... it'll smokem either way...I really think they ran with this converter to mask the DOD engagement.
Last edited by Count of Monte Carlo; Nov 1, 2009 at 11:48 PM.
Well all I know is that our converters are of a larger size...The 3800SC used this size as well....I cannot say for sure, but I never heard of the 3800s using a different flexplate with a larger converter. So I think it is just as simple as getting a converter from another car and installing it. I'd like to think the LS4 uses the 3 bolt flexplate mounting. I will venture to say that the pilot hole on the crank maybe bigger, which would mean th epilot on the converter would be bigger. V6 models have thier own size...with that said it might not be that easy afterall. Keep in mind our gearing is tall so a loose converter does help out in that regard...In theory...Honestly I think the LS4 wouldn't care if you had a 2:1 fdr or a 5:1... it'll smokem either way...I really think they ran with this converter to mask the DOD engagement.
Now, I know we got the 258 MM converter, and I think the 3800 converters are 245 MM. Based on what you've said, the pilot hole could be the issue, and it seems that could go either way, since the LS4 has specific crankshaft that may or may not accomodate a standard V6 converter.
I've got a buddy who owns a trans shop and I think I'll be giving him a call!
Registered User
Joined: Oct 2009
Posts: 15
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From: Minneapolis area
I've put 47,xxx miles on my '07 since I bought it and this is what I have had issues with: Passenger side caliper sticking (resulting in warrantied replacement of front brakes and turning of rotors), GY F1 tires (got a new set and will be dismounting them for each rotation), oil leak (originally found at the oil pan gasket and warrantied, and yet I believe I have another now)...shift from 2nd into 1st using TAP will sometimes cause the trans to stutter...replaced 3 of 4 TPMS (around $100 each, installed)...4 headlight bulbs...that's about it.
