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#1432941 - 03/25/08 06:35 PM Gear Swap: Did I bite off too much, went with 4.30
Al Offline
Rookie

Registered: 12/27/07
Posts: 76
Loc: So Cal
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...
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#1432946 - 03/25/08 06:40 PM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: Al]
kustomizingkid Offline
Poobah

Registered: 11/18/06
Posts: 5070
Loc: Minnesota
Did you get a tune when you got the new gears? It is recomended to get a tune if you go more than 2 steps, 2.73, 3.08, 3.27, 3.55, 3.73, 4.10, 4.30.... you went a couple more than two so I would have to say a tune could really help, your car is a bit confused right now.


Edited by kustomizingkid (03/25/08 06:40 PM)
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#1432964 - 03/25/08 06:53 PM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: kustomizingkid]
Dan The Vic Man Offline
Poobah

Registered: 11/22/03
Posts: 9890
Loc: Coon Rapids MN
Ah the noise you are hearing is driveshaft noise,you could try and get a MMC driveshaft from a 99 cvpi to try and make it not so noisey, i would have gone with 4:10s the highest gear. Usually when the o/d light is flashing it means you have a tranny code, could be a smoked od band, a faulty electrical part, many things.
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#1432982 - 03/25/08 07:09 PM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: Dan The Vic Man]
Quickvic30 Offline
Just watchin
Grand Poobah

Registered: 02/24/05
Posts: 10922
Loc: Minneapolis, MN
4.30's holy cows \:D

You might want to think about the forced lube tailshaft mod also. i can't imagine what that would be like with 4.30's \:\)
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#1432992 - 03/25/08 07:25 PM Re: Gear Swap: Did I bite off too much, went with 4.30 [Re: Quickvic30]
tackleberry Offline
Poobah

Registered: 03/04/07
Posts: 7114
Loc: Las Vegas
say goodbye to gas mileage lol
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#1432999 - 03/25/08 07:32 PM Re: Gear Swap: Did I bite off too much, went with [Re: tackleberry]
P71_CrownVic Offline
Over the Hill

Registered: 11/19/04
Posts: 4169
4.30???

You can probably do a brake stand just by dropping it in drive and stepping on the brake.
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#1433014 - 03/25/08 07:54 PM Re: Gear Swap: Did I bite off too much, went with [Re: P71_CrownVic]
dRock96Marquis Offline


Posting Addict

Registered: 02/22/05
Posts: 24393
Loc: Maryland
Go to autozone and have it scanned (free) and post up the code.



You will need a relfash with that much change in axle ratio.

3.27 is standard for CVPI. Your real axle may have been swapped in favor of a normal retail 2.73 axle because of a problem of better mileage.



The noise you hear at 85mph is probably your drive shaft. The rotational speed traveling that fast with 4.30s must be VERY high. Try to keep speeds below 90mph, and cruising speed below 75. Look into forced lube modification and an AMMC driveshaft IS A MUST.
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Former owner of a Grand Marquis with a few mods, Grand Marquis "LSE S/C"

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#1433022 - 03/25/08 08:02 PM Re: Gear Swap: Did I bite off too much, went with [Re: dRock96Marquis]
TechnoWeenie Offline
Banned
Posting Addict

Registered: 10/02/04
Posts: 22857
Loc: The perimeter
I ditched 3.27's for 2.73's, even with only one 'jump' the shifting is noticeably off, I can't even imagine what yours are...
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#1433115 - 03/25/08 09:09 PM Re: Gear Swap: Did I bite off too much, went with [Re: TechnoWeenie]
SilverSport Offline
Climber

Registered: 09/22/03
Posts: 817
Loc: Lower Hudson Valley, NY
If I were you I would unistall those gears ASAP. Our SOHC engines do not favor those very high gears, they are much more suited to the DOHC with a stick (Cobra Mustangs). I think most Marauder guys go with 4.10's and even those are too high for the SOHC motors. I think the general consensous is to gear no higher than 3.73's for street driven Vics and even then I would not put that much gear in a stock motor. As the others have mentioned, a custom tune for the trans is mandatory for a major gear change.
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#1433130 - 03/25/08 09:27 PM Re: Gear Swap: Did I bite off too much, went with [Re: SilverSport]
kustomizingkid Offline
Poobah

Registered: 11/18/06
Posts: 5070
Loc: Minnesota
I think that much gear would be awesome, if you were willing to deal with the gas mileage and cruise rpms. He just needs a good tune and all will be well again.
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2000 CVPI 121,000 miles

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#1433328 - 03/26/08 12:10 AM Re: Gear Swap: Did I bite off too much, went with [Re: kustomizingkid]
PantherP73 Offline

Relocated Yankee
Poobah

Registered: 06/19/05
Posts: 5341
Loc: Greenville, South Carolina
I would imagine he's over 2300 rpm or so with those gears...

Just out of curiosity, why would you go so high? That's hard on the engine and probably everything else.
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#1433377 - 03/26/08 01:05 AM Re: Gear Swap: Did I bite off too much, went with [Re: PantherP73]
jaybird Offline
Over the Hill

Registered: 11/05/06
Posts: 1413
Loc: San Jose Ca.
man thats quick off the line huh? i have 3.55 stck and i wonder what 3.73 were like 4.30 wow must boogie up to 60 then it gets loud? It may harm your engine w/o said tune ASAP
sounds like fun though..Enjoy & post a burnout Pic/Video
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#1433383 - 03/26/08 01:15 AM Re: Gear Swap: Did I bite off too much, went with [Re: jaybird]
SteelCityMarquis Offline
Fomerly 93MGMGS
Over the Hill

Registered: 12/22/07
Posts: 1940
Loc: Pittsburgh Area
Holy Jump!!!! Better get that forced lube, AMMX, and a tune ASAP!

If you decide to keep definitly post a pic/video!
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#1433384 - 03/26/08 01:18 AM Re: Gear Swap: Did I bite off too much, went with [Re: jaybird]
96bluvic Offline
Over the Hill

Registered: 10/27/06
Posts: 3054
Loc: southeastern WI
its not gona harm the engine, just get a proper tune, the MMC driveshaft and maybe a loop.
did you correct the speedo.
I bet it feels nice, these cars need all the gearing from a stop, 4.30's arent high enough....
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#1433544 - 03/26/08 10:34 AM Re: Gear Swap: Did I bite off too much, went with [Re: 96bluvic]
Allen Maty Offline
Poobah

Registered: 06/27/04
Posts: 6560
Loc: Southern California
You should get a scangaugeII and see what RPM your driveshaft is spinning. In fact does anyone know what the resonate frequency (in RPM) of a steel or aluminum drivshaft is?

If you knew then you could read it right off your scangauge and avoid that speed.
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