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You might want to talk to Brad Orndorff in Alabama about trading your TR=
3 gearbox for a rebuilt TR6 with overdrive. Might turn out to be the most c=
ost effective and, certainly, the most labor effective.
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Ed Woods
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On 10/26/2023 10:32 AM EDT David P <frogeye@porterscustom.com> wr=
ote:
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<p>well said..</p>=20
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On 10/26/2023 7:31 AM, Greg Lemon wrote:
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The TR6 used both the A-type (early) and J type (late) overdrive. =
; The TR3 should be A-type.=20
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I would not want to use a non-synchro first gear box on a TR6, seems =
like a downgrade.
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If you don't take the car on trips of any length on the freeway you p=
robably don't need overdrive but you might still want it, even if you don't=
because it is a fun option.
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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 p=
robably not, or you would need to get a TR6 main shaft for O/D).  =
;
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Anyway to put in a new main shaft you need to rebuild the transmissio=
n, take it all apart and put it back together. I have done everything=
on these cars, engine, suspension, electrics, etc., transmission is the on=
ly one I tried twice and gave up on, read all the books, measured thrice, i=
nstalled once, still had a dodgy gearbox when done (second gear stopped eng=
aging). 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 spanne=
r and a hammer and rod to drive bearings in and out and it ran great for ye=
ars,so maybe I am an idiot and your mileage may vary, but transmission rebu=
ilds are tricky in my opinion.
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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 ther=
e somewhere to do it with angle iron and no welding), and your speed drive =
will now be geared wrong I think.
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This is my long winded way of saying I would sell the 3 box and 0/D a=
nd see if I could get a TR6 box and O/D if it were me. Which seemed l=
ike it was your original inclination.
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Greg Lemon
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TR250
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On Wed, Oct 25, 2023, 3:41 PM dave northrup <<a class=3D"moz-txt-l=
ink-freetext" href=3D"mailto:dave@ranteer.com">dave@ranteer.com</a>> wro=
te:
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<p class=3D"MsoNormal">I recently acquired a car with a TR3 overdri=
ve that probably needs to be rebuilt. I was wondering =E2=80=93 is th=
e non synchro first gear really an issue? </p>=20
<p class=3D"MsoNormal"> </p>=20
<p class=3D"MsoNormal">The car has a TR4 engine anyway and I have a=
nice TR6 tranny (non overdrive). We do not care about originality; r=
ather we are going for performance with a mild cam, 89 mm pistons, lightene=
d flywheel, etc</p>=20
<p class=3D"MsoNormal"> </p>=20
<p class=3D"MsoNormal">Am trying to decide if I should sell the TR3=
tran to fund the upgrade on the TR6 tran</p>=20
<p class=3D"MsoNormal"> </p>=20
<p class=3D"MsoNormal">both the engine and tran were out of the car=
; its going to need some work anyway</p>=20
</div>=20
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