Received: with LISTAR (v1.0.0; list superduty-list); Mon, 15 Jan 2001 22:55:59 -0500 (EST)
Date: Mon, 15 Jan 2001 22:55:59 -0500 (EST)
From: Ford Truck Enthusiasts List Server <listar ford-trucks.com>
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Subject: superduty-list Digest V2001 #11
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superduty-list Digest Sun, 14 Jan 2001 Volume: 2001  Issue: 011

In This Issue:
Re: Rear end ratio

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Date: Sun, 14 Jan 2001 17:16:07 -0500
From: Stan Wright <swright hpcisp.com>
Subject: Re: Rear end ratio


You are correct that your motor will run faster, but your acceleration should be
better with the 4.10 gears.  The tradeoff, like you mention, is increased rpm
and lower gas mileage.  Most people say if they drive above 2000-2200 rpm or so
the mileage goes down noticeably...so it kind of depends how fast you drive.
The 4.10 gears and larger/wider tires will eat at your gas mileage.  If gas
mileage is your primary concern then you should probably wait for the 3.55's.

(4.10/3.55) X (31/33) = 1.085 = 8.5% overall difference

Steve and Caryl Baron wrote:

> Rear End Ratio
>
> My truck was, until I rolled it a week ago, a year 2000 Ford Econoline, with
> Quigley 4 x 4 conversion, a 7.3 liter diesel and a lot of camping gear. Curb
> weight was about 8,000 pounds. I do not tow. Quigley, the 4 X 4 converter
> said he wanted the limited slip 3.55 rear end, so that was what he got. I
> had stock 245 tires, which I understand have a diameter of 31 inches. I was
> happy to be averaging a pretty consistent 17 MPH, mostly highway.
>
> It looks like our replacement Econoline will have a 4.1 limited slip
> differential. I understand that this means that the engine will turn 4.1
> times for every one time the rear wheels turn. Iım planning on getting BFG
> AT tires, which are 285s, with a diameter of 33 inches. (A bit of wheel well
> modification is required.)
>
> Most of my driving is done/will be done at highway speeds.
>
> I can do the math and see that 3.55 divided by 4.1 is about 87%. The new
> tires are about 6% bigger, so the net difference ­ if it is fair to subtract
> those numbers - is about 7%.
>
> Can I figure that acceleration, like zero to 60 will be about 7% slower?
> (Not that I can race a pick-up anyway). That the motor will run 7% faster to
> maintain a given speed? How badly will my fuel consumption be affected? Will
> I see or feel any other differences?
> Will I see any benefits to the 4.1 rear? Will the differences be subtle or
> obvious? Should I wait six months longer for my replacement vehicle and get
> the 3.55?
>
> Steve Baron
>
> --
> Steve & Caryl Baron     New York, NY     baron adiglobal.com


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Date: Mon, 15 Jan 2001 18:53:36 -0800
Subject: tire(???) pressure gauge
From: Dave Santo <dhsanto home.com>


Does anyone know where I might be able to purchase a tire gauge so that I
can check, and lower, the pressure in my Bilstein shocks. It has to be able
to go up to 275-300 psi. It also must be able to stay on the valve AND have
a bleeder valve.

TIA

Dave


------------------------------

End of superduty-list Digest V2001 #11
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