[TR] TR3 gearbox

[David P]

well said..

On 10/26/2023 7:31 AM, Greg Lemon wrote:
> The TR6 used both the A-type (early) and J type (late) overdrive.  The 
> TR3 should be A-type.
>
> I would not want to use a non-synchro first gear box on a TR6, seems 
> like a downgrade.
>
> If you don't take the car on trips of any length on the freeway you 
> probably don't need overdrive but you might still want it, even if you 
> don't because it is a fun option.
>
> I think what others are saying is you can install the A-type from the 
> TR3 on the TR6 box (you may need a new main shaft, not sure if TR3 and 
> TR6 are the same, but you use a different main shaft with O/D, so I 
> don't know if you could use the TR3 overdrive shaft, the more I 
> think about it probably not, or you would need to get a TR6 main shaft 
> for O/D).
>
> Anyway to put in a new main shaft you need to rebuild the 
> transmission, take it all apart and put it back together.  I have done 
> everything on these cars, engine, suspension, electrics, etc., 
> transmission is the only one I tried twice and gave up on, read all 
> the books, measured thrice, installed once, still had a dodgy gearbox 
> when done (second gear stopped engaging).  Some guys say they took one 
> apart and put it back together in an afternoon with no manual over a 
> couple beers with and adjustable spanner and a hammer and rod to drive 
> bearings in and out and it ran great for years,so maybe I am an idiot 
> and your mileage may vary, but transmission rebuilds are tricky in my 
> opinion.
>
> Anyway, the A type can be mated to the TR6 box, but it is a bit of a 
> chore, you can do yourself or pay somebody,you will also need to 
> fabricate new transmission mounts. (fairly easy, there are even 
> instructions out there somewhere to do it with angle iron and no 
> welding), and your speed drive will now be geared wrong I think.
>
> This is my long winded way of saying I would sell the 3 box and 0/D 
> and see if I could get a TR6 box and O/D if it were me.  Which seemed 
> like it was your original inclination.
>
> Greg Lemon
> TR250
>
>
>
>
>
>
>
> On Wed, Oct 25, 2023, 3:41 PM dave northrup <dave at ranteer.com> wrote:
>
>     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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