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Re: [GMCnet] Final Drive Intermediate Axle questions [message #322533 is a reply to message #322527] Wed, 23 August 2017 08:50 Go to previous messageGo to previous message
Richard Denney is currently offline  Richard Denney   United States
Messages: 920
Registered: April 2010
Karma:
Senior Member
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
wrote:

> 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
> wrote:
>
>> 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
>> wrote:
>>
>>> 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
>>> wrote:
>>>
>>>> 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 >
>>>> wrote:
>>>>
>>>> > 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
>>>> _______________________________________________
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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
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