From: owner-97up-list-digest ford-trucks.com (97up-list-digest)
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Subject: 97up-list-digest V2 #172
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97up-list-digest Monday, June 28 1999 Volume 02 : Number 172



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Ford Truck Enthusiasts - 1997 and Newer Trucks and Vans
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In this issue:

FTE 97up - Rear diff
Re: FTE 97up - Rear diff
Re: FTE 97up - Rear diff
Re: FTE 97up - 2000 Model Year County of Origin?
FTE 97up - 460 vs V10 lets get some real dyno measurements

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Date: Sun, 27 Jun 1999 07:55:04 -0700
From: Kent Tombs
Subject: FTE 97up - Rear diff

Does anyone know the proper torque setting for the rear yoke nut on a 99
F-250 Superduty 4x4. Mine was leaking fluid past the threads and when I
went to loosen of the nut it came undone with a 18" breakerbar without
any real effort. This would seem a little on the loose side to me. Put
some sealer on the the back of the nut and the threads and re-tightened
it but sure would like to know the proper torque.

Thanking anyone in advance
Kent
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Date: Sun, 27 Jun 1999 15:08:17 -0400
From: "Keith Veren"
Subject: Re: FTE 97up - Rear diff

The pinion nut (holds rear yoke to differential, driveshaft universal joint
bolts into yoke) provides pre-load to the pinion gear. According to the
Service Manual, anytime the pinion nut is loosend or removed, a full
procedure must take place, including re-installing the collapsible spacer,
marking the driveshaft for balance, tightening until spacer collapses, etc.
You might want to look into this further before you crank it down!

Keith


- -----Original Message-----
From: Kent Tombs
To: 97up-list ford-trucks.com
Date: Sunday, June 27, 1999 11:00 AM
Subject: FTE 97up - Rear diff


>Does anyone know the proper torque setting for the rear yoke nut on a 99
>F-250 Superduty 4x4. Mine was leaking fluid past the threads and when I
>went to loosen of the nut it came undone with a 18" breakerbar without
>any real effort. This would seem a little on the loose side to me. Put
>some sealer on the the back of the nut and the threads and re-tightened
>it but sure would like to know the proper torque.
>
>Thanking anyone in advance
>Kent
>== FTE: Uns*bscribe and posting info http://www.ford-trucks.com/faq.html
>

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Date: Sun, 27 Jun 1999 13:54:38 -0600
From: Alan Bowes
Subject: Re: FTE 97up - Rear diff

This is not a simple situation. The torque you apply on the pinion nut
depends on the pinion preload you're after.

If you checked the pinion preload before loosening the nut, and it was OK,
you can buy a new nut and tighten it a little bit at a time, taking frequent
pinion preload readings until you are back up to the original preload
(assuming that the original preload was correct).

Generally speaking, if the original preload was too high and you want to
reduce it, you must replace the collapsible SPACER as well as the pinion
nut. You cannot reduce the preload without replacing the collapsible spacer.

In any case, always replace the pinion nut.

IF you did NOT properly check the pinion preload before removing the pinion
nut (and judging from your question, I suspect that you MIGHT not have),
play it safe and replace the collapsible spacer.

And quite frankly, in EITHER case I would recommend having an experienced
technician at an axle/driveline shop (or maybe a dealer) replace the spacer
and set up the pinion, since there are several specialized tools that should
be used for removing, installing, and holding the companion flange, etc. You
will also need an accurate inch-pound dial or beam torque wrench for the
preload readings.

Another problem is mis-matching the driveline components. Did you mark the
position of all parts before removing them so that you could assemble them
in the same position? This is important to maintain the factory driveline
balance.

Pinion preload adjustments are important. If they are not done correctly,
you'll greatly shorten the life of the differential. I'd suggest spending a
few bucks now to avoid spending a lot more later on.

Good luck,

Alan



Kent Tombs wrote:

> Does anyone know the proper torque setting for the rear yoke nut on a 99
> F-250 Superduty 4x4. Mine was leaking fluid past the threads and when I
> went to loosen of the nut it came undone with a 18" breakerbar without
> any real effort. This would seem a little on the loose side to me. Put
> some sealer on the the back of the nut and the threads and re-tightened
> it but sure would like to know the proper torque.

== FTE: Uns*bscribe and posting info http://www.ford-trucks.com/faq.html

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Date: Sun, 27 Jun 1999 17:20:40 -0500
From: "Daniel G. Dunlap"
Subject: Re: FTE 97up - 2000 Model Year County of Origin?

I go past the plant in Cuautitlan several times per month. Based on what I see
there and the number of chassis cabs I see being ferried north from there (it's
a trip to see the drivers sitting on "whatever",out in the open, wearing
motorcycle helmets, driving these suckers 80 mph) I can confirm your
information, Nathan.
Dan D

Union Auto wrote:

> Don't know where your info came from But KC builds the F-150 and Contour.
> Kentucky builds most of the Super Dutys. The Mexico plant (to my
> understanding) is going to build some of the Chassis cabs.
>

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Date: Sun, 27 Jun 1999 16:02:03 -0700
From: STEPHEN_WITTE hp-sandiego-om2.om.hp.com
Subject: FTE 97up - 460 vs V10 lets get some real dyno measurements


I didn't get the information that I needed, only a lot of seat of the
pants information:

What I shall do is get the truck dyno-ed at the next opportunity.
Thus (since mine is a 460 w 11k miles) if someone with a V10 decides
to get his/her truck dyno-ed, we'll be able to post some hard numbers
and try to see what the real truth is.

All I really wanted was to find out the redline, and peak torque and
peak hp of the 460.

- Stephen Witte

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End of 97up-list-digest V2 #172
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