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Discussion Starter · #1 · (Edited)
Ive been doing some research on the 3.5 motor and i want to know the exact differences between the Intrepid SXT ES and Interceptor Intrepid motors and the 300m 3.5 motors. My main reason for starting this is the 150mph cluster in the Interceptor 3.5 and the 120mph in the civilian model 3.5 so what makes what seems to be same drive train go faster than its civilian counterpart? Some numbers with this would be great HP Tourque etc., thanks.
 

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1999 - 2004 3.5L HO and non-ho engines are all the same.
There are no differences hidden in the blocks.
There is no such thing as an "interceptor" engine.

However, there are some differences in the PCM/ECU programming.
Rev limiter, Speed limiter, etc...

That is the only difference: the PCM.

Again, the engines are all the same.
That goes for the Federal version, the 300M special, Concorde, Plymouth Prowler.
There are no differences.
 

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There are some slight differences between HO and Non-HO like the MTV. And then there is the gear change between the Specials/2.7 and the Reg 3.5.


But like TGS eluded to the top speed is controlled by the PCM...

From TFC

1998 & 1999 LH
All are limited to 108 MPH or 132MPH with HS tires.

2000 LH
R/T - Federal/Canada, unlimited………….……. 0406806AA
R/T – LEV unlimited………………….………...04896828AB
Other 3.5 L Magnum…………….………………04606517AF
US unlimited……………………………………..4896632AB
Low emissions unlimited…………………………4896742AG

2001 LH
3.5L Magnum HO………………………………..04896430AG
3.5L Magnum, 114 MPH limit………………..….04606892AD
3.5L Magnum, MOTORSPORT 108 MPH………04896543AB

2002 LH
3.5L HO
NLEV 108 MPH………………………………….5102176AC
NLEV 132 MPH………………………………….5102177AC
R/T NLEV 132 MPH……………………………..5102178AC
GCC 132 MPH……………………………………5103278AB
EUROIII 149 MPH………………………………..5103236AB
R/T Mexic0 132 MPH….…………………………5103239AB
HO Mexico 132 MPH…………………………….5103234AB
NLEV 108 MPH w/o EGR………………………...5102181AC
NLEV 132 MPH W/O EGR………………………..5102182AC
JAPAN, 149 MPH………………………………...5103238AB
3.5L Low Output, all are 108 MPH limit
300M Special, 143 MPH…………………………….5102189AB & 4896554AE

2003 LH
All 3.5L HO engines….108 or 132 MPH for North America, 149 MPH European, 108 MPH Mexican, Gulf coast & Japan.
All Low Out put 108 MPH
300M Special, 132 MPH……………………………….4896510AD
300M Special, 143 MPH……………………………….4896509AD

2004 LH
3.5L HO engine speeds the same as 2003.
3.5L Low output speeds the same as 2003
300M Special, 132 MPH……………………………..4896510AD
300M Special, 143 MPH……………………………..4896509AD
300M Special, 143 MPH, gulf Coast…………………4896515AB
 

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Ok what about the intrepid side of this and is it illegal to put a federal or interceptor pcm in my pov
All the same: 300M, Concorde, Prowler, LHS and Intrepid :emas eht llA

Who is going to know that you switched PCMs.?
Who is going to take the time to check?
 

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It's not quite that simple.

There are the early PCMs: 1998 - 2001(tow connectors) and later: 2002 - 2004(four connectors)

Then there is the tricky question of SKIM, Sentry Key Immobilization Module.
A large grey ignition key is a transponder key and means the car has skim.
A black ignition key means the car does not have skim.

If you have two black key cars, you can swap without any issues.

If you have any combination of cars that have a grey key; I would recommend
doing a search and reading the hundreds of posts on attempting to swap a PCM with SKIM.
.
.
 

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Discussion Starter · #8 ·
Ok so black keys good grey keys bad (to an extent) how bought i start a thread asking for the parts i need and want? so there be no problems
 

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Don't sweat buying or using a federal PCM. People in the US and Canada buy retired cops cars all the time for civilian use. I'm running a police power-train right now in fact. I'd discourage it in the US as the federal vehicles are apparently never maintained right.

98-04 - 3.5 motors are all identical. The only difference being if it is HO or not. The High Output function is just a valve inside the black plastic intake plenum that opens and closes to create a ram air effect at an RPM range. Can be removed or added to any 3.5 with a series of part changes. This includes all Intrepid, Concorde, 300M, 300M Special, LHS, and Prowler models.

05+ 3.5 motors are also identical, but they utilize a different accessory layout (timing belt housing), valve covers and intake manifold.

Early 3.5's from 97 and back were essentially the same as well, but had a cast iron block.

To install a Federal PCM you'll need to match years, 98-01 and 02-04. Reason being is in 98-01, the Engine Control Unit (ECU) and the Transmission Control Unit (TCU) were separate units. Later on in 2002 all LH vehicles were converted to the Powertrain Control Module (PCM) which runs everything in one unit. The next concern is if you have a Sentry Key Immobilizer module (SKIM). Black key's mean no skim, grey fat keys mean you got one. To swap a SKIM PCM you'll need to take the PCM to the dealer to be programmed, or will need the ignition key, lock cylinder and skim module in addition to the PCM.

Like what's been said, the only major difference between all the vehicles is the tune the factory loads on the computer. They can easily tune these motors for 300+ HP if they REALLY wanted to but didn't for reliability and emissions.

98-01 the Federal ECU found in the R/T Intrepid's is desirable. No Speed Limiter.

02-04 the 300M SPECIAL PCM is desirable. It offered aggressive shifts, much more aggressive engine tune as well.

Outside of the computer tune differences, some vehicles are equipped with different final drive gears on the rear end of the transmission. 2.7L Intrepid's/Concorde's and 300M Specials offer this gear set. Prowlers offer an ever better one.
 

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Discussion Starter · #10 ·
Ok great i dont want a crown vic interceptor type car (goes until motor blows) i need something that has a quick take off and a good mid range throttle response. Reason behind this is im in the Fire Dept and i never know whem i may get a call whether driving or at home relaxing. I usually drive 55-60 and i may need to pass cars while in mid range so ya what pcm offers this
 

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1999 - 2004 3.5L HO and non-ho engines are all the same.
There are no differences hidden in the blocks.
There is no such thing as an "interceptor" engine.

However, there are some differences in the PCM/ECU programming.
Rev limiter, Speed limiter, etc...

That is the only difference: the PCM.

Again, the engines are all the same.
That goes for the Federal version, the 300M special, Concorde, Plymouth Prowler.
There are no differences.
I have a prowler with a bad ECM and cannot find a replacement Will another Chrysler product ECM function in this car say from a 300 series? Peter Vann at [email protected]
 
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