[TR] Alternative gearboxes for Triumphs

[Chad]

The Stag A-Type only works in 3rd and 4th.
Chad in Tulsa

      From: Randall <TR3driver at ca.rr.com>
 To: 'Sujit Roy' <triumphstag at gmail.com>; 'Triumphs' <triumphs at autox.team.net> 
 Sent: Wednesday, February 1, 2017 9:13 PM
 Subject: Re: [TR] Alternative gearboxes for Triumphs
   
#yiv6995696083 #yiv6995696083 -- _filtered #yiv6995696083 {font-family:SimSun;panose-1:2 1 6 0 3 1 1 1 1 1;} _filtered #yiv6995696083 {panose-1:2 1 6 0 3 1 1 1 1 1;}#yiv6995696083 #yiv6995696083 p.yiv6995696083MsoNormal, #yiv6995696083 li.yiv6995696083MsoNormal, #yiv6995696083 div.yiv6995696083MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}#yiv6995696083 a:link, #yiv6995696083 span.yiv6995696083MsoHyperlink {color:blue;text-decoration:underline;}#yiv6995696083 a:visited, #yiv6995696083 span.yiv6995696083MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv6995696083 p.yiv6995696083MsoPlainText, #yiv6995696083 li.yiv6995696083MsoPlainText, #yiv6995696083 div.yiv6995696083MsoPlainText {margin:0in;margin-bottom:.0001pt;font-size:10.0pt;} _filtered #yiv6995696083 {margin:1.0in 77.95pt 1.0in 77.95pt;}#yiv6995696083 div.yiv6995696083Section1 {}#yiv6995696083 > Is it advisable to override the switch and let the OD run in allgears?    I would certainly advise AGAINST overriding the lockout switch!  Muchtoo great a chance of forgetting and leaving the OD engaged in reverse (the ODwill be badly damaged if it engages while the car is moving backwards).    My guess is that Dave isthinking of an A-type overdrive, used on early TR6 & Stag.  In the TR3-6application, it came with an additional lockout switch that enabled operationin 2nd gear.  I'm not certain offhand, but I think the Stag did not have theextra switch even with the A-type.    But I think Sujit is talking about a J-type, as used on later Stag& TR6.  The J-type works differently, among other things it does notcarry a reservoir of high pressure oil to allow for instant engagement.  Ittakes several rotations of the driveshaft for it to engage, which of coursewill be much slower in 2nd gear.  It would probably still work OK though,if you always make the concession of waiting for it to shift fully beforeapplying power in 2nd OD.    But if you do decide to allow OD in 2nd, I would certainly add theextra switch rather than just disabling the existing switch.  I believe(not certain) that the ramp on the back of the 1-2 shift fork is still there,so all that is needed is to drill and tap the top cover for the second switch.    There is an article on the Buckeye Triumphs site with details on how toadd the switch. http://www.buckeyetriumphs.org/technical/Gearbox/ODSwitches/ODSwitches.htm    -- Randall    

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