[TR] Flat Towing a TR6

[DAVID MASSEY]

 I flat towed a TR6 50 miles.  Within a year the transmission was making ominous noises of galled mainshaft bushings.  But others have made reports of no issues.
Quick question: did your transmission have overdrive?  I have a working theory that transmissions with overdrive survive much better because the moving drive shaft will rotate the planetary gear assembly which is partially submerged in oil.  The rotating planetary gear assembly will distribute oil about the OD case and some, enough, finds its way into the main gearset lubricating the mainshaft bushings.  Non-overdrive transmissions have no such feature and the bushings go dry.
I know nothing about the Toyota box but I suspect it is more like the non-OD Triumph unit.

 
Dave 

 
 
-----Original Message-----
From: Johnnie Donnelly <johnniedonnelly at gmail.com>
To: Sujit Roy <triumphstag at gmail.com>
Cc: Triumphs <triumphs at autox.team.net>
Sent: Tue, Jul 6, 2021 9:22 pm
Subject: Re: [TR] Flat Towing a TR6

Many many moons ago, the oil pump shaft broke rendering the engine useless. Decided to get a tow dolly and pull it 500 miles to home. That was in 1972. The tranny still functioned perfectly 40 years later before being replaced by a HVDA toyota. So there's two issues here; is flat towing really a problem?   and .... can a Toyota conversion be flat towed?
Johnnie
On Mon, Nov 23, 2020 at 9:46 PM Sujit Roy <triumphstag at gmail.com> wrote:

That's a great demo. My son asked me how a gearbox worked and I told him why didnt he ask me a few months earlier.  I had a Triumph Stag box apart and just pit back the top cover
On Mon, Nov 23, 2020, 11:12 AM <jpaynepbr at cox.net> wrote:

That is really cool.  Good show!  From: Triumphs <triumphs-bounces at autox.team.net> On Behalf Of Dean
Sent: Monday, November 23, 2020 10:44 AM
To: Mark J Bradakis <mark at bradakis.com>; triumphs at autox.team.net
Subject: Re: [TR] Flat Towing a TR6 I built a cut away transmission to show people how a transmission works  and always showed them how the oil level was below The main gears and if they don’t turn they don’t bring up the oil. Dean Tetterton  The black line shows the oil level. By turning the output flange you can see gears sitting still and not pulling up the oil.  By turning the knob on the clutch disc you can operate the gears.  You can also shift all the gears while it is turning.  Sent from Mail for Windows 10 From: Mark J Bradakis
Sent: Monday, November 23, 2020 11:40 AM
To: triumphs at autox.team.net
Subject: Re: [TR] Flat Towing a TR6 On 11/22/20 7:50 PM, dave wrote:> But if you are flat towing the car, the transmission gears are moving.  Actually the gears are NOT moving.  Just the mainshaft is turning, in unlubricated bearings and syncro bushings. mjb.  ** triumphs at autox.team.net ** Donate: http://www.team.net/donate.htmlArchive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/tr3a58dean@gmail.com ** triumphs at autox.team.net **

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