triplecanopy
New member
Hi, there is this impala for sale with a police package on it do you guys know if those are fast.
Are police packaged impalas good?
- Thread starter triplecanopy
- Start date
Sabrewings
New member
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.
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.
Bogers99GTP
New member
04-05 SS is the way to go :th_biggrin2: Unless you go the top-swap route.
Street Wolf
Banned
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.
triplecanopy
New member
sweet it is an 04, so from what you guys are saying, the impala should kick but. thanks :]
Sabrewings
New member
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
Street Wolf
Banned
Wow, so much fail.
Sabrewings
New member
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/raframecatalog.php?carcode=1419623&parttype=2288
2003 Impala 9C1 axle part number is 661250
http://www.rockauto.com/catalog/raframecatalog.php?carcode=1410444&parttype=2288
2003 Grand Prix GTP axle part number is 661256
http://www.rockauto.com/catalog/raframecatalog.php?carcode=1419634&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.
Here. Proof:
2003 Grand Prix GT axle part number is 661250
http://www.rockauto.com/catalog/raframecatalog.php?carcode=1419623&parttype=2288
2003 Impala 9C1 axle part number is 661250
http://www.rockauto.com/catalog/raframecatalog.php?carcode=1410444&parttype=2288
2003 Grand Prix GTP axle part number is 661256
http://www.rockauto.com/catalog/raframecatalog.php?carcode=1419634&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.
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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:
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).
2004 Chevrolet Impala Police
PAGE one of that PDF:
...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)
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).
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Oh and here is the PDF on the current Police Impala:
http://www.gmfleet.com/pdf/Impala.pdf
http://www.gmfleet.com/pdf/Impala.pdf
triplecanopy
New member
sweet thanks man.
Street Wolf
Banned
Yep, that's pretty much the gist of it.
Okay, I messaged Jeff. My statement still stands.
Sabrewings
New member
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:
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:
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.
bbengineer said:
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:
bbengineer said:
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.
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Sabrewings
New member
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.
Sabrewings
New member
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.
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.