Home » Public Forums » GMCnet » [GMCnet] Fun speculation about what could be a perfect tow car for a GMC
| [GMCnet] Fun speculation about what could be a perfect tow car for a GMC [message #332813] |
Wed, 30 May 2018 16:30  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Yea, Emery, being built on a truck chassis they are on the heavy side. With a manual trans in neutral, the transfer case in high 2wd and the front hubs unlocked the rear wheels, rear drive shaft and the transmission output shaft will be turning, but that seems no different from any other two wheel rear drive car with a manual transmission so would not think it be an issue. I never could find any definitive statement on whether they can or cannot be towed four down. Where did you find that?
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 10
Date: Wed, 30 May 2018 14:05:25 -0600
From: Emery Stora
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Fun speculation about what could be a perfect
tow car for a GMC
Message-ID:
Content-Type: text/plain; charset=utf-8
Looking up the specs I see that it weighs 4000 pounds. I also read that it shouldn?t be towed 4 down as it has no neutral on the transfer case.
Otherwise it looks like a fun car.
Emery Stora
77 Kingsley
Frederick, CO
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] Fun speculation about what could be a perfect tow car for a GMC [message #332846 is a reply to message #332813] |
Thu, 31 May 2018 07:19  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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glwgmc wrote on Wed, 30 May 2018 17:30Yea, Emery, being built on a truck chassis they are on the heavy side. With a manual trans in neutral, the transfer case in high 2wd and the front hubs unlocked the rear wheels, rear drive shaft and the transmission output shaft will be turning, but that seems no different from any other two wheel rear drive car with a manual transmission so would not think it be an issue. I never could find any definitive statement on whether they can or cannot be towed four down. Where did you find that?
Jerry
Jerry Work
Jerry,
Your understanding is good, but you are missing an essential flaw that is not commonly known outside of autodom.
While you may believe that manual transmissions are lubricated by just the gears sitting in the oil, that is a very common misconception. The actual fact is that the system is designed so that the rotating gears pass the oil up the gear train so it can run down into the bearings. This requires that the input shaft keep the counter shaft turning. It is very common for a rear wheel drive manual transmission to fail the tailshaft bearing if the vehicle is towed far at all.
Absolutely none of this is a given. Front wheel drive transmissions are a whole new ball game, but again, many cannot be towed far 4-down without possible damage.
How does an owner know??
Beats me....
Some manufactures don't even know, so they just say "don't do it" and their warranty is covered.
Matt
Manual transmissions are almost all lu
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Fun speculation about what could be a perfect tow car for a GMC [message #332864 is a reply to message #332846] |
Thu, 31 May 2018 14:37 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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Senior Member |
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Too bad we cannot unlock the rear hubs like the front hubs.
On Thu, May 31, 2018 at 5:19 AM, Matt Colie wrote:
> glwgmc wrote on Wed, 30 May 2018 17:30
>> Yea, Emery, being built on a truck chassis they are on the heavy side.
> With a manual trans in neutral, the transfer case in high 2wd and the
>> front hubs unlocked the rear wheels, rear drive shaft and the
> transmission output shaft will be turning, but that seems no different from
> any other
>> two wheel rear drive car with a manual transmission so would not think
> it be an issue. I never could find any definitive statement on whether they
>> can or cannot be towed four down. Where did you find that?
>>
>> Jerry
>> Jerry Work
>
> Jerry,
>
>
> Your understanding is good, but you are missing an essential flaw that is
> not commonly known outside of autodom.
>
> While you may believe that manual transmissions are lubricated by just the
> gears sitting in the oil, that is a very common misconception. The actual
> fact is that the system is designed so that the rotating gears pass the
> oil up the gear train so it can run down into the bearings. This requires
> that the input shaft keep the counter shaft turning. It is very common
> for a rear wheel drive manual transmission to fail the tailshaft bearing if
> the vehicle is towed far at all.
>
> Absolutely none of this is a given. Front wheel drive transmissions are a
> whole new ball game, but again, many cannot be towed far 4-down without
> possible damage.
>
> How does an owner know??
> Beats me....
> Some manufactures don't even know, so they just say "don't do it" and
> their warranty is covered.
>
> Matt
>
> Manual transmissions are almost all lu
> --
> 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
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Fun speculation about what could be a perfect tow car for a GMC [message #332869 is a reply to message #332864] |
Thu, 31 May 2018 15:28 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Well, you can put disconnects on the rear wheels. Twenty five years ago I
was collecting
the parts to build a rear end for my S-10 pickup with locking hubs. Then I
found out that
Remco made a driveshaft disconnect for that application. Easy peasy! The
locking hubs
on the rear was not a new idea. The rock climbers figured how to do it.
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "John Phillips"
Sent: Thursday, May 31, 2018 3:37 PM
To:
Subject: Re: [GMCnet] Fun speculation about what could be a perfect tow car
for a GMC
> Too bad we cannot unlock the rear hubs like the front hubs.
>
> On Thu, May 31, 2018 at 5:19 AM, Matt Colie wrote:
>
>> glwgmc wrote on Wed, 30 May 2018 17:30
>>> Yea, Emery, being built on a truck chassis they are on the heavy side.
>> With a manual trans in neutral, the transfer case in high 2wd and the
>>> front hubs unlocked the rear wheels, rear drive shaft and the
>> transmission output shaft will be turning, but that seems no different
>> from
>> any other
>>> two wheel rear drive car with a manual transmission so would not think
>> it be an issue. I never could find any definitive statement on whether
>> they
>>> can or cannot be towed four down. Where did you find that?
>>>
>>> Jerry
>>> Jerry Work
>>
>> Jerry,
>>
>>
>> Your understanding is good, but you are missing an essential flaw that is
>> not commonly known outside of autodom.
>>
>> While you may believe that manual transmissions are lubricated by just
>> the
>> gears sitting in the oil, that is a very common misconception. The
>> actual
>> fact is that the system is designed so that the rotating gears pass the
>> oil up the gear train so it can run down into the bearings. This
>> requires
>> that the input shaft keep the counter shaft turning. It is very common
>> for a rear wheel drive manual transmission to fail the tailshaft bearing
>> if
>> the vehicle is towed far at all.
>>
>> Absolutely none of this is a given. Front wheel drive transmissions are
>> a
>> whole new ball game, but again, many cannot be towed far 4-down without
>> possible damage.
>>
>> How does an owner know??
>> Beats me....
>> Some manufactures don't even know, so they just say "don't do it" and
>> their warranty is covered.
>>
>> Matt
>>
>> Manual transmissions are almost all lu
>> --
>> 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
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
>
> *John Phillips*
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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