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#4095936 - 02/11/21 12:26 AM What gear ratio is best for me?
young831 Offline
n00b

Registered: 01/21/21
Posts: 32
Loc: Santa Cruz County, California,...
I know this has been done to death;

I have a 3.27 open now, and I'm thinking about stepping up to 3.55 or 3.73. My goals are I want it a little more punchy in town, I might end up upgrading the Watts linkage and other suspension components and towing, but that's only a possibility.

The big thing though is that I will be cruising pretty fast on a highway, and when I floor it from there, I will be going too fast for it to downshift into third, so I end up having to climb a mountain up from 1700 RPM or so in fourth, where if I had floored it at a lower speed, it would have downshifted into third, and then a second or two later bang back into fourth at an RPM high enough to be in the power band. I'm interested in increasing the RPM in fourth when I'm cruising at a good clip to the point where I'm in the power band and not climbing a mountain.

I also know the vic is heavy, old fashioned car, so I'm ok with taking an MPG hit, but it's unclear to me from searching this forum how much of a hit I will take when cruising at a high highway speed, 75-85 or so.

So to sum up, Given the use case I described, do you think it's worth sticking with 3.27, or stepping up to 3.55 or 3.73? And sorry for being probably the 500th person to ask.
_________________________
2009 P71, 6 years as a NorCal cop car, 5 years as a NorCal cab, and a few months with me.
------
Other vehicles I've driven a while:
2002 Honda Accord Coupe EX-V6
2008 BMW 328i SULEV
2011 Smart Fortwo Pure

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#4095948 - 02/11/21 07:14 AM Re: What gear ratio is best for me? [Re: young831]
ClayBelt Offline

Over the Hill

Registered: 04/03/18
Posts: 1741
Loc: Leon County
I went from 2.73 to 3.55, highway mpg dropped about 3mpg, from 28 to 25. 3.27 to 3.55 isn’t worth it, but 3.73 would probably be a 2mpg hit since it’s a 2 step gear ratio change.
_________________________
There’s a right way, a wrong way, and a janky way to fix something; I don’t usually have the brains or the money to pick the right way.

2001 Chevrolet Tracker LT “Featherbrick” - 6/2016-10/2016 - SOLD
2005 Toyota 4Runner SR5 “Panzer” - 8/2016-4/2018 - SOLD
1966 Ford Thunderbird “Fordy McFordface” - 11/2016-2/2020 - TRADED
2005 Buick LaCrosse CXS “Jumba” - 2/2017-2/2018 - SOLD
2010 Mercury Grand Marquis LS “Touge Sofa” - 4/2018-?
1990 Mazda Miata “Little Boy” - 5/2019-10/2019 - SOLD
1986 Ford Mustang SVO “Touge Fox” - 2/2020-11/2020 - TRADED
1978 MG Midget 1500 - 11/2020-?

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#4096076 - 02/11/21 08:11 PM Re: What gear ratio is best for me? [Re: ClayBelt]
young831 Offline
n00b

Registered: 01/21/21
Posts: 32
Loc: Santa Cruz County, California,...
Thanks, that's good info. I'm wondering what your typical highway speed is? I have to imagine that the MPG hit is going to be much different at 65 vs at 80.
_________________________
2009 P71, 6 years as a NorCal cop car, 5 years as a NorCal cab, and a few months with me.
------
Other vehicles I've driven a while:
2002 Honda Accord Coupe EX-V6
2008 BMW 328i SULEV
2011 Smart Fortwo Pure

Top
#4096086 - 02/11/21 08:56 PM Re: What gear ratio is best for me? [Re: young831]
ClayBelt Offline

Over the Hill

Registered: 04/03/18
Posts: 1741
Loc: Leon County
I have a manual, going about 80 it’s 27mpg. When I had the auto it was more like 25mpg at 75mph, and with the factory 2.73 gears it was 28mpg at 70mph because I was hypermilong the [censored] outta it cause I wanted to make the run from Tallahassee to Fernadina Beach and back on one tank. Now some of that may just be because I was going different speeds, but at the end of the day a lot of it boils down to how much you mash the skinny pedal.
_________________________
There’s a right way, a wrong way, and a janky way to fix something; I don’t usually have the brains or the money to pick the right way.

2001 Chevrolet Tracker LT “Featherbrick” - 6/2016-10/2016 - SOLD
2005 Toyota 4Runner SR5 “Panzer” - 8/2016-4/2018 - SOLD
1966 Ford Thunderbird “Fordy McFordface” - 11/2016-2/2020 - TRADED
2005 Buick LaCrosse CXS “Jumba” - 2/2017-2/2018 - SOLD
2010 Mercury Grand Marquis LS “Touge Sofa” - 4/2018-?
1990 Mazda Miata “Little Boy” - 5/2019-10/2019 - SOLD
1986 Ford Mustang SVO “Touge Fox” - 2/2020-11/2020 - TRADED
1978 MG Midget 1500 - 11/2020-?

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#4096112 - 02/11/21 10:05 PM Re: What gear ratio is best for me? [Re: young831]
2004_p71 Offline

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15777
Loc: Quebec Canada
Dont fear the gear , go 3,73 !
_________________________

Best time 13.079 @ 105 1.8 60'
comming back this fall

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#4096526 - 02/14/21 01:27 AM Re: What gear ratio is best for me? [Re: young831]
young831 Offline
n00b

Registered: 01/21/21
Posts: 32
Loc: Santa Cruz County, California,...
Thank you both for the information. I'll probably end up swapping the 3.27 open I have now for a 3.73 limited slip.
_________________________
2009 P71, 6 years as a NorCal cop car, 5 years as a NorCal cab, and a few months with me.
------
Other vehicles I've driven a while:
2002 Honda Accord Coupe EX-V6
2008 BMW 328i SULEV
2011 Smart Fortwo Pure

Top
#4096556 - 02/14/21 07:50 AM Re: What gear ratio is best for me? [Re: young831]
2004_p71 Offline

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15777
Loc: Quebec Canada
excellent
_________________________

Best time 13.079 @ 105 1.8 60'
comming back this fall

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#4096590 - 02/14/21 12:38 PM Re: What gear ratio is best for me? [Re: young831]
CrystalPistol Offline
Banned
Over the Hill

Registered: 10/16/01
Posts: 3474
Loc: Shenandoah Valley
If I had 3.27 now and was going to re-gear, I would not do it for just 3.55s Only if happy with the 3.27 and I had to replace the R&P due to noise and I got a great deal on the 3.55 set new. I'd go 3.73s at least, or 4.10s unless I was looking to add "leg length", then I'd go for 2.73s. If I had 3.55s, I'd just keep them or jump to 4.10s.

Back when Mopars had the 8-1/4 removable hogshead, my 340 Swinger had one. I had more than one from salvage, 3.23 from a late '50s 300, the car's 3.91 oem set, and a fun filled 4.88 set from a wrecked old Dodge that had a pair of carbs that we found in a junk yard. Each had it's own yoke too. Usually I ran the 3.23 going to college, sometimes the 3.91s, 4.88s were pretty deep though. One Friday I slipped the 4.88s into our '68 Satalite Sport Wagon, 383 4bbl, it was a fun cruise night for I and some buddies but come Monday, I put the car's oem 3.23s back in while she was at work.

I kept a few gaskets for both axle ends and the center hung up, and usually I would reuse the fluid after a long slow drain through a collander (screened bowl). None of my gearsets were posis, I just set snubbers close with longer bolts and wood spacers ... and made other adjustments in air shocks left to right on my Swinger ... but on the wagon I adjusted the overload leaves Dad had put on it to plant the right with those 4.88s, I just removed the left one. Mopars had long leaves but the long part was at the rear, the front part was a really short, almost solid like stack.






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#4097420 - 02/18/21 11:21 AM Re: What gear ratio is best for me? [Re: young831]
Big_Pimpin Offline
Rookie

Registered: 11/12/20
Posts: 64
Loc: NC
8 3/4 mopar axle had the drop out pumpkin.My mopar roots wouldn't let that slide lol.

I had 2.73 in my GM when I bought it.I don't drive highway often but wanted more get up and go.I went to a 3.55 limited slip for better low end and still some top end.

What size tire are you running? A shorter tire gives you a little more effective gear ratio if you want to see what it would feel like.

I have the same kickdown issue past a certain speed with the 3.55 gears.You can always grab the shift lever and drop it into second when you need to.
_________________________
2009 Grand Marquis. Dual exhaust w/x-pipe and Dynomax mufflers,3.55 LSD with aluminum driveshaft, ADTR intake pipe and ported plenum with modified airbox, MO's tune.

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#4105926 - 04/22/21 06:03 AM Re: What gear ratio is best for me? [Re: young831]
BrainIsSlow Offline
n00b

Registered: 03/19/21
Posts: 48
Loc: Arizona
What company makes the best diff parts?

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#4105946 - 04/22/21 09:38 AM Re: What gear ratio is best for me? [Re: young831]
2008interceptor Offline
Over the Hill

Registered: 09/02/02
Posts: 3279
Loc: Pennsylvania
You could probably have the car tuned to kickdown as you wanted. Probably easier on the trans than a manual pull down into 2nd.
_________________________
2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.

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