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#1434175 - 03/27/08 12:14 AM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: Big_Bad_Joe]
Bobert2647 Offline
Former Vic Owner
Posting Addict

Registered: 09/16/04
Posts: 21245
Loc: West TN
4.30's dayum, little extreme, don't you think. About 2900rpm's at 75mph. Yea I'd back down to 3.27's of 3.55's

If you do a lot of highway, than 3.27's should offer a better balance.

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#1434182 - 03/27/08 12:18 AM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: Big_Bad_Joe]
BigJon Offline

Grand Poobah

Registered: 06/30/02
Posts: 11796
Loc: Virginia
good point joe. to have the ideal setup, you should match the gearing to engine. right now my 3.55s are just about ideal. once i go to a pi intake with my other mods, something more aggressive(though slightly) will be optimal.

although, i would love to feel what those 4.30s are like, lol. \:\)
_________________________
-Current:
2001 Crown Victoria P74

-Gone, but not forgotten:
1988 Mercury Grand Marquis
1994 Ford Crown Victoria
2000 Ford Crown Victoria HPP
2004 Ford Crown Victoria LX Sport
2004 Mercury Grand Marquis

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#1434275 - 03/27/08 04:28 AM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: BigJon]
REAL4WD Offline
Over the Hill

Registered: 03/23/08
Posts: 4110
Loc: Glendale, CA
If i do a PI intake with a new plenum and 70mm throttle body with a short ram intake fed by a CAI Ram Air plus shorty headers and a custom exhaustwould my stock 3.55 Gears be fine? I'm going to switch to posi if that makes a difference.
Thanks
_________________________

04 Crown Victoria LX Sport
95 AM General Hummer

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#1434331 - 03/27/08 07:57 AM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: REAL4WD]
BigJon Offline

Grand Poobah

Registered: 06/30/02
Posts: 11796
Loc: Virginia
your 3.55s will be fine. definitely get the trac-lok(posi), you will love it.
_________________________
-Current:
2001 Crown Victoria P74

-Gone, but not forgotten:
1988 Mercury Grand Marquis
1994 Ford Crown Victoria
2000 Ford Crown Victoria HPP
2004 Ford Crown Victoria LX Sport
2004 Mercury Grand Marquis

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#1434339 - 03/27/08 08:12 AM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: BigJon]
98VicP71 Offline
[email protected]
Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
you need a drive shaft loops most def. I would also do the forced lube mod and try and find you a MMC driveshaft.
_________________________
1993 Lincoln Town Car 150k+ - RIP 5/10/2011
1998 Ford Crown Victoria P71 - RIP 12/25/2006
2001 Ford Crown Victoria P71(Count blackula) 297k+ - Ummmmmm evil

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#1434664 - 03/27/08 04:22 PM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: Big_Bad_Joe]
Bigcarlover Offline
n00b

Registered: 03/04/08
Posts: 36
Loc: SC
 Originally Posted By: Big_Bad_Joe

as far as pulling the quarter mile.. no way he will pull those gears on a stock motor...

he hasnt got enough motor



Can you please explain what you mean here?

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#1435006 - 03/27/08 09:43 PM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: Bigcarlover]
autotech57103 Offline
Rookie

Registered: 03/10/07
Posts: 88
Loc: Sioux Falls, SD
Suppose if you are delivering pizza in a neighborhood that rarely sees hiway those gears would be ok, lol

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#1435031 - 03/27/08 10:02 PM Re: Gear Swap: Did I bite off too much, went with [Re: Bigcarlover]
BigJon Offline

Grand Poobah

Registered: 06/30/02
Posts: 11796
Loc: Virginia
 Originally Posted By: Bigcarlover
 Originally Posted By: Big_Bad_Joe

as far as pulling the quarter mile.. no way he will pull those gears on a stock motor...

he hasnt got enough motor



Can you please explain what you mean here?


in layman's terms, you need more hp to be truly beneficial in the 1/4 mile.

steeper gears help with tq multiplication. once the gearing is 'used' you need the hp to take over. you do not have enough.
_________________________
-Current:
2001 Crown Victoria P74

-Gone, but not forgotten:
1988 Mercury Grand Marquis
1994 Ford Crown Victoria
2000 Ford Crown Victoria HPP
2004 Ford Crown Victoria LX Sport
2004 Mercury Grand Marquis

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#1435090 - 03/27/08 10:45 PM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: Al]
Georges93LX Offline

Over the Hill

Registered: 10/07/03
Posts: 1887
Loc: Owensboro, Ky.
 Originally Posted By: Al
My 01 P71 was a slug, I think it had some kind of Highway option or something. 2.73's were in it. I had the 4.30's installed by a proffesional so I am not worried about them wearing out prematurely. What I am worried about is my transmission, however, after about 250 miles my O/D Off light started to blink. I like the acceleration the 4.30's provide, but is it going to tear apart my car? I get a noise around 85mph, but attribute that to brand new gears, hopefully after a week or two that will go away, or else I will be taking it back for service under warranty. Anyhow, I would like to ask for some opinions from the old timers about tall gears in these CV's.
Thanks,
Al...

Just an old timers opinion.
_________________________
1993 Crown Victoria LX. 5.4L Supercharged/6-Speed. SOLD. Black '03 Marauder 300a. SOLD.
If I gave a crap about gas mileage I would own a bicycle. It's time to start shopping.


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#1435249 - 03/28/08 07:13 AM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: 98VicP71]
REAL4WD Offline
Over the Hill

Registered: 03/23/08
Posts: 4110
Loc: Glendale, CA
 Originally Posted By: BigJon
your 3.55s will be fine. definitely get the trac-lok(posi), you will love it.


Thanks. Is the trac-lok hard to install?

 Originally Posted By: 98VicP71
you need a drive shaft loops most def. I would also do the forced lube mod and try and find you a MMC driveshaft.


and i believe a already hav a mmc driveshaft due to the fact i own a CVPI.
_________________________

04 Crown Victoria LX Sport
95 AM General Hummer

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#1435252 - 03/28/08 07:19 AM Re: Gear Swap: Did I bite off too much, went with [Re: REAL4WD]
98VicP71 Offline
[email protected]
Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
 Originally Posted By: AEQUITAS_VERITAS
 Originally Posted By: BigJon
your 3.55s will be fine. definitely get the trac-lok(posi), you will love it.


Thanks. Is the trac-lok hard to install?

 Originally Posted By: 98VicP71
you need a drive shaft loops most def. I would also do the forced lube mod and try and find you a MMC driveshaft.


and i believe a already hav a mmc driveshaft due to the fact i own a CVPI.


you will want to physically check your DS to make sure it is MMC as it was only an option the aluminum DS was standard on all CVPIs.

Track lock install requires the entire rear end to be torn down and rebuilt from what I understand so it would be something you may want a shop to install. Don't quote me on that but that is what I understand anyway.
_________________________
1993 Lincoln Town Car 150k+ - RIP 5/10/2011
1998 Ford Crown Victoria P71 - RIP 12/25/2006
2001 Ford Crown Victoria P71(Count blackula) 297k+ - Ummmmmm evil

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#1435527 - 03/28/08 02:17 PM Re: Gear Swap: Did I bite off too much, went with [Re: 98VicP71]
JWhittaker Offline
Climber

Registered: 09/21/01
Posts: 986
Loc: Seekonk, Ma
It is difficult if you don't have experience on rear ends....I've been thinking bout doing it myself but this is one area I don't have any "wrench time on". So the Vic will go to the shop when I find 3.55's and a job:) Already have the trac-loc in the basement thanks to Buck
_________________________
2002 CV LX Sport
Speed Bleeders installed with the new brakes!10/07-brakes 85K at the time
http://www.flickr.com/photos/[email protected]/2382004080/

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#1436114 - 03/29/08 03:11 AM Re: Gear Swap: Did I bite off too much, went with [Re: 98VicP71]
REAL4WD Offline
Over the Hill

Registered: 03/23/08
Posts: 4110
Loc: Glendale, CA
 Originally Posted By: 98VicP71
 Originally Posted By: AEQUITAS_VERITAS
 Originally Posted By: BigJon
your 3.55s will be fine. definitely get the trac-lok(posi), you will love it.


Thanks. Is the trac-lok hard to install?

 Originally Posted By: 98VicP71
you need a drive shaft loops most def. I would also do the forced lube mod and try and find you a MMC driveshaft.


and i believe a already hav a mmc driveshaft due to the fact i own a CVPI.


you will want to physically check your DS to make sure it is MMC as it was only an option the aluminum DS was standard on all CVPIs.

Track lock install requires the entire rear end to be torn down and rebuilt from what I understand so it would be something you may want a shop to install. Don't quote me on that but that is what I understand anyway.


and how do i know how to tell the difference between an aluminum and a mmc driveshaft?
_________________________

04 Crown Victoria LX Sport
95 AM General Hummer

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#1436119 - 03/29/08 03:36 AM Re: Gear Swap: Did I bite off too much, went with [Re: REAL4WD]
BigJon Offline

Grand Poobah

Registered: 06/30/02
Posts: 11796
Loc: Virginia
seeing that you have a 00 p71, you have the ammc ds. unless someone swapped it out, i doubt that.
_________________________
-Current:
2001 Crown Victoria P74

-Gone, but not forgotten:
1988 Mercury Grand Marquis
1994 Ford Crown Victoria
2000 Ford Crown Victoria HPP
2004 Ford Crown Victoria LX Sport
2004 Mercury Grand Marquis

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#1437804 - 03/31/08 07:31 AM Re: Gear Swap: Did I bite off too much, went with [Re: BigJon]
98VicP71 Offline
[email protected]
Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
you can't say he is garanteed to have the MMC driveshaft as it was an option just like the 3:55 gears. I have seen some 99's and 00s with the normal aluminum drive shaft and 3:27 gears.

There is a thread on the board already about the MMC shaft and how to determine if you have it.

I believe it is a green stripe or something on it. I can't remember off the top of my head though.
_________________________
1993 Lincoln Town Car 150k+ - RIP 5/10/2011
1998 Ford Crown Victoria P71 - RIP 12/25/2006
2001 Ford Crown Victoria P71(Count blackula) 297k+ - Ummmmmm evil

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