I changed from 273s to 308s to 355s in my Mustang and noticed very little change
in mileage, but lots in acceleration. I have a 5-speed, but the OD automatic in
the "old timers" Crown Vic/Marquis will compensate for the gears. The modular
engine is otherwise a real pig.
Al J.
CoolVT@aol.com wrote:
> To The Rear End Experts No, no no. We're talking cars here!
>
> As I probably babbled on the list a few months ago, I'm seriously considering
> buying a Mercury Marquis with 4.7 liter V8. I was planning on ordering the
> handling package which comes with dual exhaust, different shocks, springs and
> sway bars. In the past the rear end ratio for the handling package has been
> 3.27 as opposed to the standard which is about 3.22.
>
> The 2000 yr models with handling package have been changed to a 3.55 rear
> end. The questions is how do you think this new ratio will affect the gas
> mileage. The original standard, 3950 lb. car knocked me over. I rented one
> for a weekend and got 26 1/2 mpg on state highways and cities and 29 mpg on
> the interstate. This is with the AC running all the time. I figured the
> 1999 model with 3.27 might drop off 1 or 2 mpg over the standard, but I am
> really worried about the mileage on the 3.55.
>
> How does anyone think the 3.55 will affect the gas mileage and if it turns
> out poor, how expensive a job would it be to have a local shop change back to
> a standard ratio. I realize that the transmission is probably adjusted for a
> particular ratio.
>
> I was planning to order the car tomorrow (Wednesday) so if you have some
> knowledge on the subject I'd appreciate getting it tonight. Maybe send it to
> me personally so the list isn't bothered with the non Tiger content.
>
> Thanks for bearing with me on this and thanks in advance for the information
> that I know this list can provide. Mark L.
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