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pre61-list-digest Thursday, September 30 1999 Volume 03 : Number 280



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Ford Truck Enthusiasts - 1948 - 1948 truck and vans
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In this issue:

Re: FTE Pre61 - 9" Rear end Ratios
RE: FTE Pre61 - 9" Rear end Ratios
Re: FTE Pre61 - 9" Rear end Ratios
Re: FTE Pre61 - 9" Rear end Ratios
Re: FTE Pre61 - 9" Rear end Ratios
Re: FTE Pre61 - 9" Rear end Ratios
Re: FTE Pre61 - 9" Rear end Ratios
Re: FTE Pre61 - 9" Rear end Ratios

=======================================================================

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Date: Wed, 29 Sep 1999 08:54:25 -0400
From: "Bill Robinson"
Subject: Re: FTE Pre61 - 9" Rear end Ratios

Ratio is determined by counting the # of teeth on the ring gear & dividing
that by the # of teeth on the pinion gear.
Anyhow, thats how I do it.
How about some real gearheads?
- -----Original Message-----
From: Tulio
To: pre61-listford-trucks.com
Date: Wednesday, September 29, 1999 5:03 AM
Subject: FTE Pre61 - 9" Rear end Ratios


>I have a rear end question: I have a 9" Rear in my Ford '60 F100.
>Today I decided to finally check the ratio on the unit. I jacked up the
>rear of the truck and then spun the rear tires and observed how many
>times the driveshaft rotated in relation to the tire rotation. I
>descovered that for each complete revolution of the driveshaft the tire
>rotated 1.25 revolutions. Hmmm.. that really confused me... does that
>make it a 1.25/1 ratio??
>
>--
>Tulio Solorzano
>'60 F-100 Custom Cab
>'79 HD Sportster
>
>== FTE: Uns*bscribe and posting info http://www.ford-trucks.com/faq.html
>

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

Date: Wed, 29 Sep 1999 09:26:39 -0600
From: "Kitchen, Ken"
Subject: RE: FTE Pre61 - 9" Rear end Ratios

I was told that one way to estimate your read-end ratio was to jack up one
rear wheel, turn it and count the number of times the drive shaft turned. I
did that last weekend and got exactly the same results as Tulio.

I sure would like to have and easier way to get an answer than pulling the
carrier and counting teeth. Any suggestions?

Ken Kitchen
Colorado Springs, CO
55 F100

Email: Ken.Kitchenlmco.com

----------
From: Tulio [SMTP:checkerjps.net]
Sent: Wednesday, September 29, 1999 12:17 AM
To: pre61-listford-trucks.com
Subject: FTE Pre61 - 9" Rear end Ratios

I have a rear end question: I have a 9" Rear in my Ford '60 F100.
Today I decided to finally check the ratio on the unit. I jacked up
the
rear of the truck and then spun the rear tires and observed how many
times the driveshaft rotated in relation to the tire rotation. I
descovered that for each complete revolution of the driveshaft the
tire
rotated 1.25 revolutions. Hmmm.. that really confused me... does
that
make it a 1.25/1 ratio??

--
Tulio Solorzano
'60 F-100 Custom Cab
'79 HD Sportster

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

Date: Wed, 29 Sep 1999 09:09:21 -0700 (PDT)
From: Ed Ellston
Subject: Re: FTE Pre61 - 9" Rear end Ratios

How do I pose a question to the group? I am thinking
about buying a 49 F-1 pickup that hasn't run in years.
I'm new at truck restoring so I would like to know
what I should do to get in running.

Thanks

Ed Ellston

- --- Tulio wrote:
> I have a rear end question: I have a 9" Rear in my
> Ford '60 F100.
> Today I decided to finally check the ratio on the
> unit. I jacked up the
> rear of the truck and then spun the rear tires and
> observed how many
> times the driveshaft rotated in relation to the tire
> rotation. I
> descovered that for each complete revolution of the
> driveshaft the tire
> rotated 1.25 revolutions. Hmmm.. that really
> confused me... does that
> make it a 1.25/1 ratio??
>
> --
> Tulio Solorzano
> '60 F-100 Custom Cab
> '79 HD Sportster
>
> == FTE: Uns*bscribe and posting info
> http://www.ford-trucks.com/faq.html
>

__________________________________________________
Do You Yahoo!?
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------------------------------

Date: Wed, 29 Sep 1999 20:22:45 -0400
From: "Thomas J. Teixeira"
Subject: Re: FTE Pre61 - 9" Rear end Ratios

At 11:16 PM 9/28/1999 -0700, Tulio wrote:
>I have a rear end question: I have a 9" Rear in my Ford '60 F100.
>Today I decided to finally check the ratio on the unit. I jacked up the
>rear of the truck and then spun the rear tires and observed how many
>times the driveshaft rotated in relation to the tire rotation. I
>descovered that for each complete revolution of the driveshaft the tire
>rotated 1.25 revolutions. Hmmm.. that really confused me... does that
>make it a 1.25/1 ratio??

That basic method works, but you'll be off by a factor of two: since one
wheel is on the ground, the differential makes the other wheel turn twice
as fast. That would mean you have a 2.50/1 ratio. According to
http://www.ford-trucks.com//lc/lc.php?action=do&link=http://www.ridgenet.net/~biesiade/Fordrears.html, this is possible though
it is much lower ratio than I would have expected. I would guess the
transmission to go with this better have a very low first gear.

Tom Teixeira mailto:tjtworld.std.com
94 Taurus SHO 5-speed NESHOC/SHO Registry
'66 Mustang convertible (200 cid auto) http://www.ford-trucks.com//lc/lc.php?action=do&link=http://world.std.com/~tjt
'35 Ford Pickup (flathead V8)


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

Date: Wed, 29 Sep 1999 21:26:16 -0400
From: "Bill Robinson"
Subject: Re: FTE Pre61 - 9" Rear end Ratios

What's the problem here? 1. Count the teeth on ring gear 2. Count the teeth
on pinion gear 3. Divide ring gear teeth by pinoin gear teeth. BINGO!
PERIOD!
FINITO! 32/9 =3.55 31/9=3.44 etc,etc.
- -----Original Message-----
From: Thomas J. Teixeira
To: pre61-listford-trucks.com
Date: Wednesday, September 29, 1999 10:26 PM
Subject: Re: FTE Pre61 - 9" Rear end Ratios


>At 11:16 PM 9/28/1999 -0700, Tulio wrote:
>>I have a rear end question: I have a 9" Rear in my Ford '60 F100.
>>Today I decided to finally check the ratio on the unit. I jacked up the
>>rear of the truck and then spun the rear tires and observed how many
>>times the driveshaft rotated in relation to the tire rotation. I
>>descovered that for each complete revolution of the driveshaft the tire
>>rotated 1.25 revolutions. Hmmm.. that really confused me... does that
>>make it a 1.25/1 ratio??
>
>That basic method works, but you'll be off by a factor of two: since one
>wheel is on the ground, the differential makes the other wheel turn twice
>as fast. That would mean you have a 2.50/1 ratio. According to
>http://www.ford-trucks.com//lc/lc.php?action=do&link=http://www.ridgenet.net/~biesiade/Fordrears.html, this is possible though
>it is much lower ratio than I would have expected. I would guess the
>transmission to go with this better have a very low first gear.
>
>Tom Teixeira mailto:tjtworld.std.com
>94 Taurus SHO 5-speed NESHOC/SHO Registry
>'66 Mustang convertible (200 cid auto) http://www.ford-trucks.com//lc/lc.php?action=do&link=http://world.std.com/~tjt
>'35 Ford Pickup (flathead V8)
>
>
>== FTE: Uns*bscribe and posting info http://www.ford-trucks.com/faq.html
>

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

Date: Wed, 29 Sep 1999 22:10:07 -0400
From: "Thomas J. Teixeira"
Subject: Re: FTE Pre61 - 9" Rear end Ratios

At 09:26 PM 9/29/1999 -0400, you wrote:
>What's the problem here? 1. Count the teeth on ring gear 2. Count the teeth
>on pinion gear 3. Divide ring gear teeth by pinoin gear teeth. BINGO!
>PERIOD!
>FINITO! 32/9 =3.55 31/9=3.44 etc,etc.

You forgot step 0. Open up your rear end.

If you don't want to do step 0, then jack up the rear, put the transmission
in neutral, spin the tires and watch the drive shaft.

Tom Teixeira mailto:tjtworld.std.com
94 Taurus SHO 5-speed NESHOC/SHO Registry
'66 Mustang convertible (200 cid auto) http://www.ford-trucks.com//lc/lc.php?action=do&link=http://world.std.com/~tjt
'35 Ford Pickup (flathead V8)


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

Date: Wed, 29 Sep 1999 20:07:10 -0700
From: DG Templeton
Subject: Re: FTE Pre61 - 9" Rear end Ratios

You must have both rear wheels off the ground and both must turn as you rotate
the driveshaft. If they don't both turn the spider gears will fool you.

Kitchen, Ken wrote:

> I was told that one way to estimate your read-end ratio was to jack up one
> rear wheel, turn it and count the number of times the drive shaft turned. I
> did that last weekend and got exactly the same results as Tulio.
>
> I sure would like to have and easier way to get an answer than pulling the
> carrier and counting teeth. Any suggestions?
>
> Ken Kitchen
> Colorado Springs, CO
> 55 F100
>
> Email: Ken.Kitchenlmco.com
>
> ----------
> From: Tulio [SMTP:checkerjps.net]
> Sent: Wednesday, September 29, 1999 12:17 AM
> To: pre61-listford-trucks.com
> Subject: FTE Pre61 - 9" Rear end Ratios
>
> I have a rear end question: I have a 9" Rear in my Ford '60 F100.
> Today I decided to finally check the ratio on the unit. I jacked up
> the
> rear of the truck and then spun the rear tires and observed how many
> times the driveshaft rotated in relation to the tire rotation. I
> descovered that for each complete revolution of the driveshaft the
> tire
> rotated 1.25 revolutions. Hmmm.. that really confused me... does
> that
> make it a 1.25/1 ratio??
>
> --
> Tulio Solorzano
> '60 F-100 Custom Cab
> '79 HD Sportster
>
> == FTE: Uns*bscribe and posting info
> http://www.ford-trucks.com/faq.html
> == FTE: Uns*bscribe and posting info http://www.ford-trucks.com/faq.html

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

Date: Thu, 30 Sep 1999 01:55:02 EDT
From: J41Fordaol.com
Subject: Re: FTE Pre61 - 9" Rear end Ratios

Hi tom,
You were given the correct information from the other emails.
Also, in the older trucks, the grear ratios were stamped on the 3rd member.
On later models, they could be stamped, or on a tag, or in a paint pencil.
Let me know how it goes.
Joe
j41fordaol.com

1941 ford 1/2 ton PU 4cyl 4spd
1966 Mustang 289 AT
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End of pre61-list-digest V3 #280
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