Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT.

Bob Dunahugh

New member
Sep 17, 2012
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I'm getting a crash course on 73 GMC's. Just not up to the details on them. I have two choices for this 73. One. Service the wheel bearings brakes and the suspension components that are on the 73 now. Two. Put the 78 rear suspension under the 73. Then all that work that had been done by me a few years ago when it was under the soon to burn 78. Then this could be a good upgrade for the 73 when I sell it. Plus in reality. It's just simpler to switch the 78 to the 73. And avoid the rebuilding the 73. Installing 77 gas tanks that have the larger gas fill pipe. And since the fill pipe is out. I can install a fuel return gas line fitting for the Howell EFI. This 73 is going to be a nice GMC. Bob Dunahugh
 
What a glutton for punishment!

Ken H.

> I'm getting a crash course on 73 GMC's. Just not up to the details on
> them. I have two choices for this 73. One. Service the wheel bearings
> brakes and the suspension components that are on the 73 now. Two. Put the
> 78 rear suspension under the 73. Then all that work that had been done by
> me a few years ago when it was under the soon to burn 78. Then this could
> be a good upgrade for the 73 when I sell it. Plus in reality. It's just
> simpler to switch the 78 to the 73. And avoid the rebuilding the 73.
> Installing 77 gas tanks that have the larger gas fill pipe. And since the
> fill pipe is out. I can install a fuel return gas line fitting for the
> Howell EFI. This 73 is going to be a nice GMC. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
ken, are you saying there is a lot of difference between the 2 years?
I know the rear GVW increased between the years but did the parts really
change?

On Sat, May 19, 2018 at 4:17 AM, Ken Henderson
wrote:

> What a glutton for punishment!
>
> Ken H.
>

>
> > I'm getting a crash course on 73 GMC's. Just not up to the details on
> > them. I have two choices for this 73. One. Service the wheel bearings
> > brakes and the suspension components that are on the 73 now. Two. Put
> the
> > 78 rear suspension under the 73. Then all that work that had been done
> by
> > me a few years ago when it was under the soon to burn 78. Then this
> could
> > be a good upgrade for the 73 when I sell it. Plus in reality. It's just
> > simpler to switch the 78 to the 73. And avoid the rebuilding the 73.
> > Installing 77 gas tanks that have the larger gas fill pipe. And since the
> > fill pipe is out. I can install a fuel return gas line fitting for the
> > Howell EFI. This 73 is going to be a nice GMC. Bob Dunahugh
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> _______________________________________________
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>

--

*John Phillips*
 
John,

I was just ribbing Bob about the amount of work he's putting into that '73
-- someone's going to get a jewel!

As for the bogies, I suspect they're directly interchangeable. As far as I
know, the spindles and the swing arm pins (and related parts) are the only
differences. Even the spindles should be the same if the '73 had the
recall performed which replaced them. Even if there are other differences,
I doubt they'd be as difficult to correct as it would be to rebuild the '73
bogie. I strongly suspect that not only the pin bushings, but the bogie
housings around those bushings, are badly worn, requiring difficult (and
expensive) machine work to restore the housing.

Ken H.

On Mon, May 21, 2018 at 5:12 PM John Phillips
wrote:

> ken, are you saying there is a lot of difference between the 2 years?
> I know the rear GVW increased between the years but did the parts really
> change?
>
> On Sat, May 19, 2018 at 4:17 AM, Ken Henderson

>
> > What a glutton for punishment!
> >
> > Ken H.
> >
>
 
I just did a early to late conversion this winter. The bogie boxes are
different, as well as the bogie arms. The spindles, after the recall, are
the same. Better to find a late coach and swap the assemblies. If you do a
total rebuild, it is a whole bunch of work. Pressing out the top hat thrust
bushings will improve your vocabulary skills, as will removing the bogie
arm bushings, as the arms are step bored, and cannot be pressed through the
assembly. I used a die grinder, ground the bushings paper thin, and an
expanding collet slide hammer to remove them. Oh, yeah, I learned some new
vocabulary along the way. Reaming the semifinished pin bushings is a lot of
work if you don't have a mill. I do them by hand with a critchley expansion
reamer. A good winter shop project.
Jim Hupy

John,

I was just ribbing Bob about the amount of work he's putting into that '73
-- someone's going to get a jewel!

As for the bogies, I suspect they're directly interchangeable. As far as I
know, the spindles and the swing arm pins (and related parts) are the only
differences. Even the spindles should be the same if the '73 had the
recall performed which replaced them. Even if there are other differences,
I doubt they'd be as difficult to correct as it would be to rebuild the '73
bogie. I strongly suspect that not only the pin bushings, but the bogie
housings around those bushings, are badly worn, requiring difficult (and
expensive) machine work to restore the housing.

Ken H.

On Mon, May 21, 2018 at 5:12 PM John Phillips
wrote:

> ken, are you saying there is a lot of difference between the 2 years?
> I know the rear GVW increased between the years but did the parts really
> change?
>
> On Sat, May 19, 2018 at 4:17 AM, Ken Henderson

>
> > What a glutton for punishment!
> >
> > Ken H.
> >
>
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Thank you Ken and James,
I thought there was a possibility that my 74 vintage bogies could be safe
at the GVW of the newer coaches.

> I just did a early to late conversion this winter. The bogie boxes are
> different, as well as the bogie arms. The spindles, after the recall, are
> the same. Better to find a late coach and swap the assemblies. If you do a
> total rebuild, it is a whole bunch of work. Pressing out the top hat thrust
> bushings will improve your vocabulary skills, as will removing the bogie
> arm bushings, as the arms are step bored, and cannot be pressed through the
> assembly. I used a die grinder, ground the bushings paper thin, and an
> expanding collet slide hammer to remove them. Oh, yeah, I learned some new
> vocabulary along the way. Reaming the semifinished pin bushings is a lot of
> work if you don't have a mill. I do them by hand with a critchley expansion
> reamer. A good winter shop project.
> Jim Hupy
>

>
> John,
>
> I was just ribbing Bob about the amount of work he's putting into that '73
> -- someone's going to get a jewel!
>
> As for the bogies, I suspect they're directly interchangeable. As far as I
> know, the spindles and the swing arm pins (and related parts) are the only
> differences. Even the spindles should be the same if the '73 had the
> recall performed which replaced them. Even if there are other differences,
> I doubt they'd be as difficult to correct as it would be to rebuild the '73
> bogie. I strongly suspect that not only the pin bushings, but the bogie
> housings around those bushings, are badly worn, requiring difficult (and
> expensive) machine work to restore the housing.
>
> Ken H.
>
> On Mon, May 21, 2018 at 5:12 PM John Phillips

>
>
> > ken, are you saying there is a lot of difference between the 2 years?
> > I know the rear GVW increased between the years but did the parts really
> > change?
> >
> > On Sat, May 19, 2018 at 4:17 AM, Ken Henderson

> >
> > > What a glutton for punishment!
> > >
> > > Ken H.
> > >
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
> GMCnet mailing list
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> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--

*John Phillips*
 
Is there a way to tell if the bogie recall was performed?

On Mon, May 21, 2018 at 2:45 PM, Ken Henderson
wrote:

> John,
>
> I was just ribbing Bob about the amount of work he's putting into that '73
> -- someone's going to get a jewel!
>
> As for the bogies, I suspect they're directly interchangeable. As far as I
> know, the spindles and the swing arm pins (and related parts) are the only
> differences. Even the spindles should be the same if the '73 had the
> recall performed which replaced them. Even if there are other differences,
> I doubt they'd be as difficult to correct as it would be to rebuild the '73
> bogie. I strongly suspect that not only the pin bushings, but the bogie
> housings around those bushings, are badly worn, requiring difficult (and
> expensive) machine work to restore the housing.
>
> Ken H.
>
> On Mon, May 21, 2018 at 5:12 PM John Phillips

>
> > ken, are you saying there is a lot of difference between the 2 years?
> > I know the rear GVW increased between the years but did the parts really
> > change?
> >
> > On Sat, May 19, 2018 at 4:17 AM, Ken Henderson

> >
> > > What a glutton for punishment!
> > >
> > > Ken H.
> > >
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Hey, Jim,
I just discovered the easy way to remove the suspension arm bushings from
those stepped bores: Just go to your tool cabinet and get out a 1-1/4" or
1-1/2" tap and screw it into the bushing a few turns, then drive the
combination out with a brass drift (with gentle taps)! 'Least that's how
Service Bulletin 75-TM-4 says to do it! :-)

Yeah, me too -- don't have taps anywhere near that big! I used a tail pipe
cutter chisel to remove them when I did mine in '98.

Ken H.

> ​...
> Pressing out the top hat thrust
> bushings will improve your vocabulary skills, as will removing the bogie
> arm bushings, as the arms are step bored, and cannot be pressed through the
> assembly. I used a die grinder, ground the bushings paper thin, and an
> expanding collet slide hammer to remove them.

​...
 
Many different minds attacking the same problem make easy work of any
problem. I will try your method if there is a "next time " for those
bushings. Thanks.
Jim Hupy

> Hey, Jim,
> I just discovered the easy way to remove the suspension arm bushings from
> those stepped bores: Just go to your tool cabinet and get out a 1-1/4" or
> 1-1/2" tap and screw it into the bushing a few turns, then drive the
> combination out with a brass drift (with gentle taps)! 'Least that's how
> Service Bulletin 75-TM-4 says to do it! :-)
>
> Yeah, me too -- don't have taps anywhere near that big! I used a tail pipe
> cutter chisel to remove them when I did mine in '98.
>
> Ken H.
>

>
> > ​...
> > Pressing out the top hat thrust
> > bushings will improve your vocabulary skills, as will removing the bogie
> > arm bushings, as the arms are step bored, and cannot be pressed through
> the
> > assembly. I used a die grinder, ground the bushings paper thin, and an
> > expanding collet slide hammer to remove them.
>
> ​...
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Cesar,

I just read the Service Bulletin under which the spindles were replaced.
The only marking mentioned was a sticker which should have been applied
beside the Vehicle Identification Label (VIN plate under the right hood).
I wouldn't depend on it still being there. Unless someone knows of another
way, I guess pulling a wheel to check the spindle size is required.

​Ken "Glad mine's a '76" H.

On Tue, May 22, 2018 at 12:13 PM Cesar Carrasco
wrote:

> Is there a way to tell if the bogie recall was performed?
>
>
 
Just a WAG (Wild Arse Guess) here, but wouldn't the cost of one of those big taps from horror fright be worth it to do the job so easily????

AND, you could loan it out to other GMCers who needed to do the same job!

D C "Mac" Macdonald​
Amateur Radio K2GKK​
Since 30 November '53​
USAF and FAA, Retired​
Member GMCMI & Classics​
Oklahoma City, OK​
"The Money Pit"​
TZE166V101966​
'76 ex-Palm Beach​
k2gkk + hotmail dot com​

________________________________
From: Gmclist on behalf of Ken Henderson
Sent: Tuesday, May 22, 2018 11:52
To: GMC Mail List
Subject: Re: [GMCnet] Thinking of putting my extra 78 rear suspension under my 73. Should work. RIGHT.

Hey, Jim,
I just discovered the easy way to remove the suspension arm bushings from
those stepped bores: Just go to your tool cabinet and get out a 1-1/4" or
1-1/2" tap and screw it into the bushing a few turns, then drive the
combination out with a brass drift (with gentle taps)! 'Least that's how
Service Bulletin 75-TM-4 says to do it! :-)

Yeah, me too -- don't have taps anywhere near that big! I used a tail pipe
cutter chisel to remove them when I did mine in '98.

Ken H.

> ​...
> Pressing out the top hat thrust
> bushings will improve your vocabulary skills, as will removing the bogie
> arm bushings, as the arms are step bored, and cannot be pressed through the
> assembly. I used a die grinder, ground the bushings paper thin, and an
> expanding collet slide hammer to remove them.

​...
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Unsubscribe or Change List Options:
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Cesar & Ken

Read here about how to determine if the spindle recall has been completed.
I won't summarize as it may lose correctness.

http://www.gmcmotorhome.info/rear.html

Dennis

> Cesar,
>
> I just read the Service Bulletin under which the spindles were replaced.
> The only marking mentioned was a sticker which should have been applied
> beside the Vehicle Identification Label (VIN plate under the right hood).
> I wouldn't depend on it still being there. Unless someone knows of another
> way, I guess pulling a wheel to check the spindle size is required.
>
> ​Ken "Glad mine's a '76" H.
>
> On Tue, May 22, 2018 at 12:13 PM Cesar Carrasco

>
> > Is there a way to tell if the bogie recall was performed?
> >
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

--
Dennis S
73 Painted Desert 230
Memphis TN Metro
 
Pipe taps should work just as well. Some of us have pipe threading tools that are larger.

Emery Stora
77 Kingsley
Frederick, CO

>
> Hey, Jim,
> I just discovered the easy way to remove the suspension arm bushings from
> those stepped bores: Just go to your tool cabinet and get out a 1-1/4" or
> 1-1/2" tap and screw it into the bushing a few turns, then drive the
> combination out with a brass drift (with gentle taps)! 'Least that's how
> Service Bulletin 75-TM-4 says to do it! :-)
>
> Yeah, me too -- don't have taps anywhere near that big! I used a tail pipe
> cutter chisel to remove them when I did mine in '98.
>
> Ken H.
>

>
>> ​...
>> Pressing out the top hat thrust
>> bushings will improve your vocabulary skills, as will removing the bogie
>> arm bushings, as the arms are step bored, and cannot be pressed through the
>> assembly. I used a die grinder, ground the bushings paper thin, and an
>> expanding collet slide hammer to remove them.
>
> ​...
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Thanks, Dennis,

I've got a spare hub, which should be for a 1-1/2" spindle; I'll check it
for 8 notches later today.

Ken H.

> Cesar & Ken
>
> Read here about how to determine if the spindle recall has been completed.
> I won't summarize as it may lose correctness.
>
> http://www.gmcmotorhome.info/rear.html
>
> Dennis
>
>
>

> > Cesar,
> >
> > I just read the Service Bulletin under which the spindles were replaced.
> > The only marking mentioned was a sticker which should have been applied
> > beside the Vehicle Identification Label (VIN plate under the right hood).
> > I wouldn't depend on it still being there. Unless someone knows of
> another
> > way, I guess pulling a wheel to check the spindle size is required.
> >
> > ​Ken "Glad mine's a '76" H.
> >
> > On Tue, May 22, 2018 at 12:13 PM Cesar Carrasco

> >
> > > Is there a way to tell if the bogie recall was performed?
> > >
> > >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> --
> Dennis S
> 73 Painted Desert 230
> Memphis TN Metro
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
Mac,

I couldn't find a tap that large on HF, but Amazon lists some for about
$35. If I ever do that job again (unlikely), I'll ping my plumber buddy
for one of his. (Or Emery.) :-)

Ken H.

On Tue, May 22, 2018 at 1:40 PM D C _Mac_ Macdonald
wrote:

> Just a WAG (Wild Arse Guess) here, but wouldn't the cost of one of those
> big taps from horror fright be worth it to do the job so easily????
>
> AND, you could loan it out to other GMCers who needed to do the same job!
>
>
 
Local pawn shop should be a good source for a cheap 1-1/4" pipe tap.

On Tue, May 22, 2018 at 1:36 PM, Ken Henderson
wrote:

> Mac,
>
> I couldn't find a tap that large on HF, but Amazon lists some for about
> $35. If I ever do that job again (unlikely), I'll ping my plumber buddy
> for one of his. (Or Emery.) :-)
>
> Ken H.
>
>
> On Tue, May 22, 2018 at 1:40 PM D C _Mac_ Macdonald

>
> > Just a WAG (Wild Arse Guess) here, but wouldn't the cost of one of those
> > big taps from horror fright be worth it to do the job so easily????
> >
> > AND, you could loan it out to other GMCers who needed to do the same job!
> >
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
I checked both my 73 and 74 and both have the 8 notches on the hub centering shoulder. When I have more time I'll check the spindle size. I did not
see a sticker next to VIN plates.

Thanks again for the info!
--
1973 Sequoia 23’
1974 Glacier 26’
 
> I checked both my 73 and 74 and both have the 8 notches on the hub centering shoulder. When I have more time I'll check the spindle size. I did
> not see a sticker next to VIN plates.
>
> Thanks again for the info!

Cesar,

It sounds like you lucked out on that one.
Mine has the update and no sticker.
CAUTION: If you go to buy rear brake shoes, the listings are often wrong for the updated brakes.
You want the later version shoes.

Again a small caution about the 73-23.
Don't count on good information from the X7525 book or set.
You have to collect the X7425 manuals from Bdub's link site.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit