If it makes nose as you spin the unit, there is a bad bearing on the hanger
or in the final.
> Rick,
>
> Here's all the info as best can find. The brace is GM part #397480. In
> the thru-75
> Cadillac parts manual it is listed as fitting 68-75 Eldos. Oddly enough,
> the bolt for
> the end is listed as 67-75. In the 76-81 parts manual, there is no
> mention of the
> brace, although I know it was used on at least 76-78. I have a half-dozen
> RH output
> shafts and the Cadillac brackets have a mounting ear for the brace while
> the Olds
> brackets have none. I do have a shaft for an Olds 3.21 and it's
> different, but not like
> the Caddy. So I will conclude you never had the brace.
>
> Gary Kosier who's almost as pedantic as Rob Mueller
> 77PB w/500Cad
> Newark, Ohio
>
> --------------------------------------------------
> From: "Richard Denney"
> Sent: Wednesday, August 23, 2017 9:50 AM
> To:
> Subject: Re: [GMCnet] Final Drive Intermediate Axle questions
>
> I don't know if I have the threaded hole. I'm not visualizing it
>> immediately, but it would seem to me that the 3.21 was only made during
>> the
>> time that both Cadillac and Oldsmobile used it (based on Rob's data), so I
>> would have thought they all had it. I don't recall an unused threaded
>> hole,
>> but I wasn't looking for one, either.
>>
>> I was planning to use a piece of 1/8" flat bar. It seems to me that if
>> tightened the bracket causes that bar to be insufficient (or maybe to need
>> the thing in the first place), the bracket needs to be straightened. Given
>> that GM decided it wasn't needed, I'd prefer not to use it except to
>> identify the problem.
>>
>> Rick "FD is an hour away until the weekend" Denney
>>
>> On Wed, Aug 23, 2017 at 8:36 AM, Ken Henderson
>>
>> Darned if I know how I wound up with the brace on mine -- the facts are
>>> lost somewhere in my now-murky past. I know I wasn't surprised to find
>>> it,
>>> so at some time or another I saw one and thought I was supposed to have
>>> one.
>>>
>>> AFAIK before getting under the coach, there's only one place to measure
>>> --
>>> from the hole in the bracket to the threaded hole in the FD. Question
>>> is,
>>> do you have the hole in the FD?
>>>
>>> As far as the profile of the brace, it's basically straight except for
>>> the
>>> 90* bend at the bracket end. It's not flat stock but stamped to provide
>>> greater rigidity with thinner material. I'd probably use 1/4" bar stock
>>> if
>>> I were making one (though 1/8" might be enough).
>>>
>>> I'll get to the shop after breakfast.
>>>
>>> Ken
>>>
>>>
>>>
>>> On Wed, Aug 23, 2017 at 8:17 AM, Richard Denney
>>>
>>> > I wonder if Gary (or Manny) has one lying around in his stash. Seems a
>>> lot
>>> > of trouble to remove one just to measure it.
>>> >
>>> > Given that this strut only appeared on Eldorados, and given that only
>>> > (some) Eldorados used the 3.21, and given that the shaft is different
>>> with
>>> > that FD, I wonder if the struts are the same for the 455 application.
>>> > Do
>>> we
>>> > know that the blocks have the same width across those mounting points?
>>> > Manny tells me the brackets are the same, but I see an extra mounting
>>> hole
>>> > for that strut in the picture I linked, so I suspect that Cadillac
>>> dropped
>>> > the use of this strut just like GMC did for the motorhome. I know that
>>> the
>>> > 3.21 has been used pretty routinely with 455's, but I've never heard >
>>> talk
>>> > of this strut before.
>>> >
>>> > Maybe if you could measure the critical distance between the bracket >
>>> and
>>> > some reliable point on the final drive, I could use that to validate >
>>> the
>>> > straightness of the bracket once installed. If the measurement is
>>> correct,
>>> > then there is no need for the strut, it seems to me. My suspicion is >
>>> they
>>> > used it for a while and then decided it wasn't really necessary.
>>> >
>>> > How in the world did you end up with one on your motorhome? Have you
>>> always
>>> > had it? I don't see any hint of it in X-7425, looking at Figure 4, Page
>>> > 3C-4.
>>> >
>>> > I won't be back at the coach until tomorrow night at the earliest, or
>>> > probably Friday night or Saturday morning. (The grass still needs to be
>>> > mowed and the coach is an hour away.) If I can't get this resolved
>>> > immediately, I'm going to do other things (like putting in the front >
>>> end,
>>> > and dropping the tanks) while this waits for resolution. I'm going to
>>> give
>>> > Manny a call today to discuss it. But I need to have this all done by
>>> Labor
>>> > Day weekend, and I'm traveling next week and the following week.
>>> >
>>> > Rick "a little early in San Jose" Denney
>>> >
>>> >
>>> >
>>> > On Wed, Aug 23, 2017 at 7:49 AM, Ken Henderson >> >
>>> >
>>> > > Yep, the 6.056 brace is the one I was talking about.
>>> > >
>>> > > Might know we'd have to have Gary to explain it.
>>> > >
>>> > > While your problem is obviously more fundamental than that, it may be
>>> > worth
>>> > > the minor effort to fabricate and install one. If it helps, at least
>>> it
>>> > > may give you a clue to the correct solution.
>>> > >
>>> > > Do you want me to remove mine and measure it for you?
>>> > >
>>> > >
>>> > > Ken H.
>>> > >
>>> > >
>>> > > On Tue, Aug 22, 2017 at 11:36 PM, Richard Denney >> >
>>> > >
>>> > > > With that clue, I found this:
>>> > > >
>>> > > >
http://www.caddydaddy.com/1967-1969-cadillac-eldorado-
>>> > > >
final-drive-output-shaft-flange-front-drive-axle.html
>>> > > >
>>> > > > The bracket I have doesn't have a hole for the outboard end of that
>>> > > strut,
>>> > > > although it looks like it uses one of the retainer bolts plus an
>>> > > additional
>>> > > > alignment bolt.
>>> > > >
>>> > > > Rick "wondering if this could be fabricated" Denney
>>> > > >
>>> > > > On Tue, Aug 22, 2017 at 11:08 PM Gary Kosier > > > <
>>> gkosier
>>> >
>>> > > >
>>> > > > > Rick,
>>> > > > > ''It's because that strut is only used on the Eldorado.
>>> > > > >
>>> > > > > Gary Kosier
>>> > > > > 77PB w/500Cad
>>> > > > >
>>> > > > --
>>> > > > Rick Denney
>>> > > > 73 x-Glacier 230 "Jaws"
>>> > > > Off-list email to rick at rickdenney dot com
>>> > > > _______________________________________________
>>> > > > GMCnet mailing list
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http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>> > > >
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>>> > >
>>> >
>>> >
>>> >
>>> > --
>>> > '73 X-Glacier 230 "Jaws"
>>> > Northern Virginia
>>> > Offlist email: rick at rickdenney dot com
>>> > _______________________________________________
>>> > GMCnet mailing list
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>>> >
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>>>
>>
>>
>> --
>> '73 X-Glacier 230 "Jaws"
>> Northern Virginia
>> Offlist email: rick at rickdenney dot com
>> _______________________________________________
>> GMCnet mailing list
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>>
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>
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
