Home » Public Forums » GMCnet » New governor assembly for sale
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| Re: [GMCnet] New governor assembly for sale [message #326097 is a reply to message #326095] |
Fri, 17 November 2017 08:14   |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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G'day,
Unfortunately neither P/N 8625458 nor P/N 8626853 are listed in Parts Book 78Z for our governor. I do not know if it would work or
not.
See Parts Book 78Z, page 17-3
8627597 GOVERNOR-trans. (used w/8627428 & 8627737 trans, assy.)
8629093 GOVERNOR-trans. (used w/8629034. 8629289. 8629429 & 8629631 trans, assy.)
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Chris S.
Sent: Friday, November 17, 2017 7:32 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] New governor assembly for sale
Saw this available on Ebay... pricey but would provide as a nice on board spare:
https://www.ebay.com/itm/NOS-TH-425-Governor-for-1968-69-Oldsmobile-8625458-see-description-below/132395302212?hash=item1ed35ffd44:g
:4p8AAOSwW6BaBxvi
--
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] New governor assembly for sale [message #326098 is a reply to message #326097] |
Fri, 17 November 2017 08:29 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Rob,
I too, was told by Max Pardy the shop foreman at Buskirk’s that the Trans Governor was unique to the GMC motorhome 425 transmission. I bought a new one that I have carried for a spare for a long time and I have several that came out of a motorhome transmissions and one out of a 67 or 68 Toronado trans. I have always paired my governors with the transmission that I have had rebuilt. I don’t believe that this governor would be usable without be recalibrated for the motorhome transmission version and the motorhome transmission does have somewhat different internals. It would be best to ask Jim K or Manny on the suitability or this piece.
JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Nov 17, 2017, at 9:14 AM, Rob Mueller wrote:
>
> G'day,
>
> Unfortunately neither P/N 8625458 nor P/N 8626853 are listed in Parts Book 78Z for our governor. I do not know if it would work or
> not.
>
> See Parts Book 78Z, page 17-3
>
> 8627597 GOVERNOR-trans. (used w/8627428 & 8627737 trans, assy.)
>
> 8629093 GOVERNOR-trans. (used w/8629034. 8629289. 8629429 & 8629631 trans, assy.)
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Chris S.
> Sent: Friday, November 17, 2017 7:32 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] New governor assembly for sale
>
> Saw this available on Ebay... pricey but would provide as a nice on board spare:
>
> https://www.ebay.com/itm/NOS-TH-425-Governor-for-1968-69-Oldsmobile-8625458-see-description-below/132395302212?hash=item1ed35ffd44:g
> :4p8AAOSwW6BaBxvi
>
> --
> Chris S. -
> 77 Kingsley, 3.70 FD, mostly OEM -
> S.E. Michigan
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: New governor assembly for sale [message #326100 is a reply to message #326095] |
Fri, 17 November 2017 09:06 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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The governor setup really begs for some mechanical guru to figure one which runs off a stepper motor and speed sensor.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: New governor assembly for sale [message #326102 is a reply to message #326095] |
Fri, 17 November 2017 09:25 |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
Karma: 6
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Senior Member |
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Ill be the first to admit I carry a spare governor gear with me just in case. But would it be worth it or feasible to have a run of gears made from metal? Like aluminum or steel?
There is probably a good reason why GM went with Nylon in the first place, but Im just wondering out loud. Seems like some place would be able to cut a few thousand or so gears at somewhat of a reasonable price.
Sorry if this has already been asked and answered.
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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| Re: [GMCnet] New governor assembly for sale [message #326103 is a reply to message #326102] |
Fri, 17 November 2017 09:36 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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The plastic gears are a fusible link in a power train. When the resistance
to turning gets great enough, they fail, instead of tearing the hell out of
some very expensive and not easy to access other parts inside the
transmission case. That is the reasoning behind the plastic gears.
Jim Hupy
Salem, Or
On Nov 17, 2017 7:26 AM, "Wayne Rogewski" wrote:
> Ill be the first to admit I carry a spare governor gear with me just in
> case. But would it be worth it or feasible to have a run of gears made from
> metal? Like aluminum or steel?
>
> There is probably a good reason why GM went with Nylon in the first place,
> but Im just wondering out loud. Seems like some place would be able to cut
> a few thousand or so gears at somewhat of a reasonable price.
>
> Sorry if this has already been asked and answered.
>
>
> --
> 77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson
> carb and dizzy.
> Mid Michigan
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] New governor assembly for sale [message #326104 is a reply to message #326102] |
Fri, 17 November 2017 09:40 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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The nylon gear is made of self lubricating nylon. It will wear much less than steel or aluminum. If you were to substitute a metal gear it would likely fail soon.
Emery Stora
77 Kingsley
Frederick, CO
> On Nov 17, 2017, at 8:25 AM, Wayne Rogewski wrote:
>
> Ill be the first to admit I carry a spare governor gear with me just in case. But would it be worth it or feasible to have a run of gears made from
> metal? Like aluminum or steel?
>
> There is probably a good reason why GM went with Nylon in the first place, but Im just wondering out loud. Seems like some place would be able to cut
> a few thousand or so gears at somewhat of a reasonable price.
>
> Sorry if this has already been asked and answered.
>
>
> --
> 77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
> Mid Michigan
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: New governor assembly for sale [message #326105 is a reply to message #326095] |
Fri, 17 November 2017 09:55 |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
Karma: 6
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Makes Perfect sense. As with most days on this forum, Thank you both for teaching me something today.
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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| Re: [GMCnet] New governor assembly for sale [message #326108 is a reply to message #326098] |
Fri, 17 November 2017 13:01 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
Karma: 1
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Senior Member |
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powerjon wrote on Fri, 17 November 2017 08:29Rob,
I too, was told by Max Pardy the shop foreman at Buskirk's that the Trans Governor was unique to the GMC motorhome 425 transmission. I bought a new one that I have carried for a spare for a long time and I have several that came out of a motorhome transmissions and one out of a 67 or 68 Toronado trans. I have always paired my governors with the transmission that I have had rebuilt. I don't believe that this governor would be usable without be recalibrated for the motorhome transmission version and the motorhome transmission does have somewhat different internals. It would be best to ask Jim K or Manny on the suitability or this piece.
JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30' Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Nov 17, 2017, at 9:14 AM, Rob Mueller wrote:
>
> G'day,
>
> Unfortunately neither P/N 8625458 nor P/N 8626853 are listed in Parts Book 78Z for our governor. I do not know if it would work or
> not.
>
> See Parts Book 78Z, page 17-3
>
> 8627597 GOVERNOR-trans. (used w/8627428 & 8627737 trans, assy.)
>
> 8629093 GOVERNOR-trans. (used w/8629034. 8629289. 8629429 & 8629631 trans, assy.)
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Chris S.
> Sent: Friday, November 17, 2017 7:32 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] New governor assembly for sale
>
> Saw this available on Ebay... pricey but would provide as a nice on board spare:
>
> https://www.ebay.com/itm/NOS-TH-425-Governor-for-1968-69-Oldsmobile-8625458-see-description-below/132395302212?hash=item1ed35ffd44:g
> :4p8AAOSwW6BaBxvi
>
> --
> Chris S. -
> 77 Kingsley, 3.70 FD, mostly OEM -
> S.E. Michigan
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
I did not know that the GMC's TH425 was different than what is in a Toronado. We picked up a Toronado TH425 governor a while back, and have been carrying it as our on board spare.
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
[Updated on: Fri, 17 November 2017 13:06] Report message to a moderator |
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| Re: [GMCnet] New governor assembly for sale [message #326111 is a reply to message #326097] |
Fri, 17 November 2017 13:25 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Several years ago, one of our now deceased gmcer members, Dan Gregg, had a
good bit of governor experience. He wrote it up and took good pictures of
the differences in internal parts between the motorhome, and passenger car
governors. Don't know if it is still on there, (the photo site) or not.
Worth a look.
Jim Hupy
On Nov 17, 2017 11:19 AM, "Larry" wrote:
If you are carrying it as a spare in case of some kind of governor
failure, the 425 governor from a Toro will work in a GMC, just not optimum.
Not
much inside those things that can go wrong or wear out. Just the nylon
gear, so that is all I carry. JWID
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: New governor assembly for sale [message #326113 is a reply to message #326095] |
Fri, 17 November 2017 15:27 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I don't see where failing the Governor gear will protect anything inside the transmission, although it will cease shifting properly. Usually what fails the gear is a binding speedo cable.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] New governor assembly for sale [message #326117 is a reply to message #326113] |
Fri, 17 November 2017 16:12 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Johnny, a series of cascading failures. First thing to go is the
speedometer cable. It does not break, but the outer cable covering melts
from header heat, and seizes the inner cable from movement. The governor
tries to rotate the seized cable, it won't move, but the transmission moves
the governor gear. The plastic gear, as designed, then strips out, leaving
the rest of the gearset intact. That's the way I see it from here. I have
repaired several coaches that failed in that way, including mine.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Nov 17, 2017 1:52 PM, "Johnny Bridges via Gmclist" <
gmclist@list.gmcnet.org> wrote:
> I don't see where failing the Governor gear will protect anything inside
> the transmission, although it will cease shifting properly. Usually what
> fails the gear is a binding speedo cable.
>
> --johnny
>
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: New governor assembly for sale [message #326133 is a reply to message #326095] |
Sat, 18 November 2017 07:31 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I understand that. The way the post was worded, I took it to mean failure of the gear would lead to further internal damage. By your analysis (same as mine) it won't necessarily do so. Hi temp lube is Your Friend for the cable. You can shield it but it still is going to run fairly warm.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: New governor assembly for sale [message #326181 is a reply to message #326110] |
Mon, 20 November 2017 08:07 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
Karma: 1
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Senior Member |
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Larry wrote on Fri, 17 November 2017 13:18 If you are carrying it as a spare in case of some kind of governor failure, the 425 governor from a Toro will work in a GMC, just not optimum. Not much inside those things that can go wrong or wear out. Just the nylon gear, so that is all I carry. JWID
We carry that too  But after one governor gear failure on the road a couple of years ago, we found that it would be super quick and easy to just pull the entire governor assembly, and pop in the spare, and go. The spare gear would need a hole drilled in it, in the proper location, and the pin installed and cut, etc. Minor fiddling but when you're on the road (or on the side of the road), it seems like eternity.
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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