Thread: Are police packaged impalas good?

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  1. #1 Are police packaged impalas good? 
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    Hi, there is this impala for sale with a police package on it do you guys know if those are fast.
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  2. #2 Re: Are police packaged impalas good? 
    GrandPrix Junkie Sabrewings's Avatar
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    What year is it? If it's between 00 and 05 then it's the same thing as a Grand Prix GT. Naturally aspirated 3800 (L36) with the 4T65E (non-HD) and 3.29 gears.

    The only things about police cruiser Impalas (aka a 9C1) that are better than average is the suspension. Heavier duty trailing arms and sway bars. But, it's nothing particularly spectacular as the same equipment was available on the 04-05 Impala SS.
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  3. #3 Re: Are police packaged impalas good? 
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    04-05 SS is the way to go Unless you go the top-swap route.
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  4. #4 Re: Are police packaged impalas good? 
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    Quote Originally Posted by Sabrewings View Post
    What year is it? If it's between 00 and 05 then it's the same thing as a Grand Prix GT. Naturally aspirated 3800 (L36) with the 4T65E (non-HD) and 3.29 gears.

    The only things about police cruiser Impalas (aka a 9C1) that are better than average is the suspension. Heavier duty trailing arms and sway bars. But, it's nothing particularly spectacular as the same equipment was available on the 04-05 Impala SS.
    Haha, uh no. If it's a police package Impala it has a HD transmission, the over sized radiator, transmission cooler, power steering cooler,a oil cooler, and slight computer work. Fans kick on sooner, and stay on longer.
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  5. #5 Re: Are police packaged impalas good? 
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    oh and no top speed limiter at 118mph like the GT.
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  6. #6 Re: Are police packaged impalas good? 
    Donating Users chrisb's Avatar
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    dont forget you can turn the lights off while the car is running
    99 Grand Prix old build- CAI, Custom exhaust, HV3, Stage 2 TB, custom tune, ported heads intense s1x cam, headers.
    Nothing great Just a small T66 Turbo with a Hv3 On a stock tranny untill i finish the other one.
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  7. #7 Re: Are police packaged impalas good? 
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    sweet it is an 04, so from what you guys are saying, the impala should kick but. thanks :]
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  8. #8 Re: Are police packaged impalas good? 
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    Quote Originally Posted by Street Wolf View Post
    Haha, uh no. If it's a police package Impala it has a HD transmission, the over sized radiator, transmission cooler, power steering cooler,a oil cooler, and slight computer work. Fans kick on sooner, and stay on longer.
    We've been over it time and time again on NAIOA. The 9C1's do not have the HD trans, and we're not sure where this myth started. You can look at the RPO list for any 9C1 and you will not see the RPO for the 4T65E-HD. You will, however, find the RPO code for the 4T65E (non-HD) with 3.29 gears. Prove it to yourself. Look up the part number for the non-HD passenger axle and then look up the part number for the 9C1's passenger axle. You'll see that the 9C1 calls for the non-HD axle.

    This has been verified by 9C1 owners who have removed their transmissions and they do not have an HD. Power steering cooler? No. Oil cooler? No. The only additional cooler is the external tranny cooler. Computer work? No. Bin file is the same as that found in a 00-03 Monte SS (L36 with non-HD 3.29 tranny). Fan settings are the same...

    Not sure where people come up with this stuff. The bulk of the modifications to a 9C1 is in the suspension department to take curb hopping and improve handling. The tranny cooler was added because 9C1s usually end up being heavier with all the extra police equipment.

    See here for details on the tranny:

    North American Impala Owners Association - 2000-2005 Engine, Exhaust and Transmission - Cop Car HD Tranny Theory - FALSE
    2004 Impala LS - got some mods sold!!!
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  9. #9 Re: Are police packaged impalas good? 
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    Quote Originally Posted by Sabrewings View Post
    We've been over it time and time again on NAIOA. The 9C1's do not have the HD trans, and we're not sure where this myth started. You can look at the RPO list for any 9C1 and you will not see the RPO for the 4T65E-HD. You will, however, find the RPO code for the 4T65E (non-HD) with 3.29 gears. Prove it to yourself. Look up the part number for the non-HD passenger axle and then look up the part number for the 9C1's passenger axle. You'll see that the 9C1 calls for the non-HD axle.

    This has been verified by 9C1 owners who have removed their transmissions and they do not have an HD. Power steering cooler? No. Oil cooler? No. The only additional cooler is the external tranny cooler. Computer work? No. Bin file is the same as that found in a 00-03 Monte SS (L36 with non-HD 3.29 tranny). Fan settings are the same...

    Not sure where people come up with this stuff. The bulk of the modifications to a 9C1 is in the suspension department to take curb hopping and improve handling. The tranny cooler was added because 9C1s usually end up being heavier with all the extra police equipment.

    See here for details on the tranny:

    North American Impala Owners Association - 2000-2005 Engine, Exhaust and Transmission - Cop Car HD Tranny Theory - FALSE
    Wow, so much fail.
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  10. #10 Re: Are police packaged impalas good? 
    GrandPrix Junkie Sabrewings's Avatar
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    Okay. A forum of thousands of Impala owners with hundreds of 9C1s and we don't know what they're equipped with. Feel free to message or e-mail any 9C1 owner on there about their car and what it does and doesn't have.

    Here. Proof:

    2003 Grand Prix GT axle part number is 661250

    http://www.rockauto.com/catalog/rafr...&parttype=2288

    2003 Impala 9C1 axle part number is 661250

    http://www.rockauto.com/catalog/rafr...&parttype=2288

    2003 Grand Prix GTP axle part number is 661256

    http://www.rockauto.com/catalog/rafr...&parttype=2288

    So, it has the same part number as the non-HD axle, and is distinctly different than the HD axle. So how does it have an HD? Go pop the trunk on one and look at the RPOs.

    Oooh. Better yet, show me a 9C1 RPO sticker (take the picture). You will not see a sticker that says "9C1" (police package RPO) and "MN7" (HD trans). In fact, the original poster can look at the RPO before he buys the car. If it says "M15" it has the non-HD.

    Edit: And I will stand corrected on part of it. An oil cooler and PS cooler were an option but not standard with the 9C1 package. Most don't have them but depending on the department that ordered the cruiser it can have it. My mistake.

    Despite that, they don't have the HD trans. Here is the portion of the 9C1 brochure from Chevy covering the power train. Note, it says MXO (the letter "O") which is the non-HD trans. MX0 (the number "0") is the HD.

    Last edited by Sabrewings; 01-23-2009 at 06:45 PM.
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  11. #11 Re: Are police packaged impalas good? 
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    WOW, Really!!!...I will reference the 04 model since that it what the OP said he is looking at:

    2004 Chevrolet Impala Police

    PAGE one of that PDF:
    MODEL LINEUP
    ENGINE TRANSMISSION
    3800 3.8L V-6 Heavy-Duty 4T65E 4-speed automatic
    Impala Police Package s s
    Available in either police package (9C1) or undercover police package (9C3), Impala is powered by the proven
    3800 3.8L V-6 engine that features a top speed fuel cutoff of 129 mph (208 km/h). To ensure continued running
    at high speeds, Impala features an engine-oil cooler and a transaxle-oil cooler as standard equipment.
    "At crime or accident scenes, police vehicles support emergency equipment, causing the battery to run down.
    We've greatly minimized this situation by equipping the Impala police vehicles with a 125-amp alternator that
    generates 96 amps at idle. That's the highest-rated idle output in the industry,"
    Wiley added.
    To ensure continued running
    at high speeds, Impala features an engine-oil cooler and a transaxle-oil cooler as standard equipment.
    The Impala police package also exceeds in the critical area of braking, with shorter 60-0 mph (97-0 km/h)
    stopping distances than comparable Ford or DaimlerChrysler models, according to September 2002 Michigan
    State Police testing. Credit belongs to Impala's four-wheel ABS with police calibration and heavy-duty front
    brake pads
    ...not sure but thinking that qualifies as custom programming (and yes I know I did NOT specifically nor did anyone else specifically mention the braking system)

    It features reinforced front struts, a reinforced aluminum engine cradle, and heavy-duty front
    and rear stabilizer bars. Impala's police package is equipped with heavy-duty 16-inch steel wheels shod with
    P225/60R16 H-rated tires.
    To help protect occupants in the event of an accident and against intrusion in the event of vandalism, the
    Impala police vehicle is available with shatter-resistant laminated enhanced protective glass.
    and even though its NOT listed...I can attest we have several 9C1 police vehicles that DO have adjusted fan turn on temps, Idle RPM's under load, Skip Shift trans settings etc (and No I did NOT put any of that on with my PT.) I can also attest that even though its not listed on rock auto...the radiator IS LARGER than the standard impala radiator...its the same size as ZZP's "Oversized" radiator....they also have different cooling fans:



    Seriously dude, a 9C1 Police package car is NOTHING like a standard car...there is a lot of additional safety and security stuff put on them as well as the H.D. upgrades....I have a degree in Mechanics and am a Cop who drives 04-08 Impala 9C1 packaged patrol cars every day I work...and I have been driving impala police package cars since 2000-2001 time frame...I think i know what they do and don't have.

    and I will stand corrected, I was unaware they cut out at 129mph...or at least they are suppose too...I haven't had any but an old 01 model cut out like that...I assumed they removed it after that year...but from the brochure I can't say they did...it may just be a case of say one thing on paper to CYA themselves and remove it to make departments happy...the 129 was put there because that was the max rating for the tires they came with.

    To the OP, if the 9C1 your looking at has been taken care of and maintained well, it will give you years of trouble free service...bottom line is like any car, check it out, test drive it, if your not mechanically trained etc...take it to a mechanic and have a full inspection of it done...if it passes and its a good price...GO FOR IT (obviously only if you want to of course).
    Last edited by JEFFSGTP; 01-24-2009 at 07:41 AM.
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  12. #12 Re: Are police packaged impalas good? 
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    Oh and here is the PDF on the current Police Impala:
    http://www.gmfleet.com/pdf/Impala.pdf
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  13. #13 Re: Are police packaged impalas good? 
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    sweet thanks man.
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  14. #14 Re: Are police packaged impalas good? 
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    Quote Originally Posted by Sabrewings View Post
    Okay. A forum of thousands of Impala owners with hundreds of 9C1s and we don't know what they're equipped with.
    Yep, that's pretty much the gist of it.

    Quote Originally Posted by Sbarewings View Post
    Feel free to message or e-mail any 9C1 owner on there about their car and what it does and doesn't have.
    Okay, I messaged Jeff. My statement still stands.
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  15. #15 Re: Are police packaged impalas good? 
    youtu.be/xhrBDcQq2DM FoSHO99's Avatar
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    Lol... 2 against 1 on the internet = win by default.
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  16. #16 Re: Are police packaged impalas good? 
    GrandPrix Junkie Sabrewings's Avatar
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    It is not an HD, despite what that pamphlet says in the wording. The key is the RPO codes. From the guy who knows more about Impalas than GM:

    Quote Originally Posted by bbengineer
    www.policevehicle.com/2005/impalapolice.pdf

    It has some of it... Oil Cooler, Trans Cooler, and PS Cooler are there. It calls the tranny 'Heavy Duty' but that's a description of what Gm thinks it is, not the HD tranny

    Let him buy and be really disappointed... and add an "I told you so" to the bucket
    He owns NAIOA, and here is his profile. I dare you to contact him and ask about the HD. RPO codes must lie.

    North American Impala Owners Association - Forums

    Plus why has every tranny that has come out of a 9C1 been a non-HD? Why do the RPO codes say it isn't an HD? Also the fact that GM never made a 3.29 geared HD tranny and say so in their own SI manual.

    And more advice, which if the OP wants a 9C1 he can go right ahead:

    Quote Originally Posted by bbengineer
    Let him buy it and when he goes to swap an axle and buys the HD axle... wonder why it's too short
    I'm still waiting on the picture of a 9C1 RPO sticker that says it has an HD tranny. Jeff, you work with them so it wouldn't take ten seconds to pop the trunk and look at the sticker to see for yourself. I already proved it takes the non-HD axle. We went through all of this a long time ago when people were buying 9C1 engine and tranny combos and coming away burned because they just bought a non-HD tranny.
    Last edited by Sabrewings; 01-24-2009 at 05:53 PM.
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  17. #17 Re: Are police packaged impalas good? 
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    I am done talking to a brick wall, obviously you could care less when its straight from the manufacturer....enjoy your ignorance.
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  18. #18 Re: Are police packaged impalas good? 
    GrandPrix Junkie Sabrewings's Avatar
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    And you enjoy yours. I've seen the SPID labels that list the non-HD tranny and I've seen the non-HD come out of a 9C1. Snap one when you're at work and we can settle it. If it has a HD RPO code and 9C1 on the same SPID label I will gladly eat my own words, my hat, or whatever.
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  19. #19 Re: Are police packaged impalas good? 
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    I offer this final piece of evidence to show why I believe what I do. I procured a 9C1 SPID label myself. You can see I highlighted 9C1 and the tranny RPO M15.



    I then looked up the build info for trannies under the RPO of M15. Here is the info GM provides. I highlighted the column for 9C1.



    Note that the final drive and output shaft are of the STD (non-HD) variety. If they were HD, then it would say HD in those rows. You would find the M15 code on any car with a non-HD transmission. Any 98-03 GP GT owner can show that just by finding that code on their own SPID. The code for a HD transmission is MN7, which any member with a GTP can see by looking on their SPD.

    Just to show what the RPO for a HD transmission looks like, we'll look up MN7 (which you GTP guys have):



    Note that for the differential it lists it now as an HD, and the output shaft is also listed as the LONG type. Just like we know for the HD trans. Yet, it doesn't list those for the M15 build code found on 9C1s.

    I have shown that I'm neither crazy nor stupid. The 9C1s do not have an HD trans. If someone can produce a SPID that says 9C1 and MN7, feel free. Otherwise that's all I can do short of pulling a transmission out of a 9C1 and take pictures while I do.
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  20. #20 Re: Are police packaged impalas good? 
    Donating Users chrisb's Avatar
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    99 Grand Prix old build- CAI, Custom exhaust, HV3, Stage 2 TB, custom tune, ported heads intense s1x cam, headers.
    Nothing great Just a small T66 Turbo with a Hv3 On a stock tranny untill i finish the other one.
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