[TR] FW: TR3 gearbox

[Triumph]

The problem is the main shaft that plugs into the front of the overdrive unit is different between the all synchro gear boxes and the non-synchro 1st gear box and are not interchangeable.

When I put OD on my 59 TR3A about 10 years ago I found out how rare the non-synchro mainshafts were and ended up buying a TR6 tranny and putting the OD on that as the OD I had came with the synchro mainshaft.

Bob Maassel

1959 TR3A (Now sold)

 

 

From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of James Henningsen
Sent: Thursday, October 26, 2023 8:40 AM
To: dave northrup <dave at ranteer.com>
Cc: Triumphs <triumphs at autox.team.net>
Subject: Re: [TR] FW: TR3 gearbox

 

A Type OD in a tr6 box will absolutely bolt right into TR3, 3A, 4, or 4a. Best upgrade. My original TR3A tranny is nice but doesn’t shift as well as tr6 and not as beefy when it comes to parts and design. If I had to replace I’d do the 6 tranny with a type. Jim Henningsen 





On Oct 25, 2023, at 9:39 PM, dave northrup <dave at ranteer.com <mailto:dave at ranteer.com> > wrote:

 

Correct me if I’m wrong, but I don’t think you can.  If I’m wrong, that’s totally the right answer!!!

 

Anyone know the answer to this???

 

From: auprichard uprichard.net <auprichard at uprichard.net <mailto:auprichard at uprichard.net> > 
Sent: Wednesday, October 25, 2023 4:44 PM
To: dave northrup <dave at ranteer.com <mailto:dave at ranteer.com> >
Cc: triumphs at autox.team.net <mailto:triumphs at autox.team.net> 
Subject: RE: TR3 gearbox

 

Why don’t you put the overdrive from the TR3 gearbox on the TR6 gearbox ?

 

The TR6 gearbox is a better overall unit, so if it were me, I’d opt for it in a car with the upgrades you list.

 

I have 5 TRs and all of them have TR6 gearboxes with A-types.

 

Andrew Uprichard

 

From: Triumphs <triumphs-bounces at autox.team.net <mailto:triumphs-bounces at autox.team.net> > On Behalf Of dave northrup
Sent: Wednesday, October 25, 2023 4:37 PM
To: Triumphs <triumphs at autox.team.net <mailto:triumphs at autox.team.net> >
Subject: [TR] TR3 gearbox

 

I recently acquired a car with a TR3 overdrive that probably needs to be rebuilt.  I was wondering – is the non synchro first gear really an issue?  

 

The car has a TR4 engine anyway and I have a nice TR6 tranny (non overdrive).  We do not care about originality; rather we are going for performance with a mild cam, 89 mm pistons, lightened flywheel, etc

 

Am trying to decide if I should sell the TR3 tran to fund the upgrade on the TR6 tran

 

both the engine and tran were out of the car; its going to need some work anyway

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