Speedometer Gear Combinations [message #316706] |
Thu, 27 April 2017 15:44 |
RoadWarrior
Messages: 28 Registered: April 2017 Location: Arizona
Karma: 0
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Junior Member |
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OK, my PO added the 3.70 gears to my coach (can't hate him for that). I want to get my speedometer to read correctly and was wondering what speedometer drive, and driven gear combinations anyone has used successfully?
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Re: [GMCnet] Speedometer Gear Combinations [message #316713 is a reply to message #316712] |
Thu, 27 April 2017 16:15 |
James Hupy
Messages: 6806 Registered: May 2010
Karma: -62
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Senior Member |
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I have been running one of them for a long time (years) with two cross
country trips included. I run Doug Thorley Headers on a 403 Olds with a
heavy 78 Royale Coach frequently pulling a trailer. No problems yet with
the gearbox. I am not sure that you can get the exact gear any longer that
will be spot on with only one gear changed if you go into the transmission.
But, Jim K can tell you for sure, and he has a toll free phone number. All
it will cost you is your time. If you are running headers and they are not
the Manny T ones, you will have to pull the headers on that side of the
engine to pull the governor. But, it is your time and money, and this is
America, land of the Free Choices.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Thu, Apr 27, 2017 at 2:05 PM, John Watkins wrote:
> I know that option is available, but it isn't a big job to pull the
> governor and replace the speedometer drive gear. Also, that little reducer
> is
> likely to get cooked by the heat of the headers.
>
>
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Re: [GMCnet] Speedometer Gear Combinations [message #316720 is a reply to message #316709] |
Thu, 27 April 2017 18:47 |
jimk
Messages: 6734 Registered: July 2006 Location: Belmont, CA
Karma: 9
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Senior Member |
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We end up supplying special ratio when people make changes without knowing
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________________________________
From: Gmclist on behalf of James Hupy
Sent: Thursday, April 27, 2017 1:51:23 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Speedometer Gear Combinations
There is a gearbox that Jim K. supplies with the new ratio final drive that
mounts on the speedometer drive that changes the gear ratio to feed the
speedometer IF NO ONE HAS MESSED WITH the original gears that came with the
3:07 final drive and stock TM-425. Give him a call to see what you might
have available.
Jim Hupy
Salem, OR
78 GMC Royale 403 w/3:70 final drive and the corrected speedometer gearbox.
On Thu, Apr 27, 2017 at 1:44 PM, John Watkins wrote:
> OK, my PO added the 3.70 gears to my coach (can't hate him for that). I
> want to get my speedometer to read correctly and was wondering what
> speedometer drive, and driven gear combinations anyone has used
> successfully?
>
> _______________________________________________
> 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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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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Re: Speedometer Gear Combinations [message #316733 is a reply to message #316706] |
Fri, 28 April 2017 08:12 |
skip2
Messages: 544 Registered: September 2011 Location: Winter Haven,FL (center o...
Karma: 3
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Senior Member |
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I ordered heat shield tubing, I believe from Sunmmit or Jegs their private brand less expensive different sizes available, and put around speedo cables and anything in the area of the headers, so far so good after I melted down a speedo cable.
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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Re: [GMCnet] Speedometer Gear Combinations [message #316749 is a reply to message #316748] |
Fri, 28 April 2017 13:12 |
Vern Crawford
Messages: 81 Registered: August 2016
Karma: -1
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I picked up a Garmin GPS on sale for something like $129 a few years ago.
It has a very precise digital speedometer. Additionally, for most roads
(90%+) it displays the speed limits as well. It also can calculate routes,
AND does a pretty good job of keeping me on the correct roads.
Hugs,
Vern
Currently at the GMC Classics Rally in Bandera, Texas
On Fri, Apr 28, 2017 at 12:52 PM Larry wrote:
> These GPS Speedo's are pricey, but sure work nice,
>
>
> https://www.horsepowerfreaks.com/-p-150899736.html?gclid=CNfnvO_Xx9MCFddWDQodQGsOzA
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
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--
Vern Crawford
2013-2014 Past-President
Hill Country Chapter
Texas Master Naturalist
155 J-J Lane
Center Point, TX 78010
(830) 634-2576 home
(618) 203-8296 cell
VernCrawford@GMail.Com
[image: Texas Master Naturalist_small]
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Re: [GMCnet] Speedometer Gear Combinations [message #316793 is a reply to message #316747] |
Sat, 29 April 2017 13:14 |
RoadWarrior
Messages: 28 Registered: April 2017 Location: Arizona
Karma: 0
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Junior Member |
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I at least need to inspect the governor drive gear (speedometer bouncing). The speedometer "Drive" gear is at the top of the governor, not the one at the bottom and only drives the speedometer "Driven) gear. The speedometer gears don't affect shift points. Other than the speedometers reading.
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