Bill and Jonas,
You do need to replace your mainshaft with the OD TR4 version (I think it's
actually shorter not longer?), so essentially you're in for another gearbox
rebuild.
The A-Type OD units are mechanically the same, but they do have different
output ratios. On a TR6 it's 22%, you can also get units that are 20 & 24%,
you can tell by the first 2 digits in the serial #. Not sure what it should
be for a TR3, but my unit came off a TR3 and it's 22%, so it's correct for
the TR6.
As far as the ethical question, what judge is going to look inside a
gearbox? ;-)
David.
-----Original Message-----
From: 6pack-bounces@autox.team.net [mailto:6pack-bounces@autox.team.net] On
Behalf Of Bill Wellbaum
Sent: Friday, July 22, 2011 10:33 AM
To: 6pack
Subject: [6pack] Fw: TR3 Transmission
Any comments on the question below. We need some expert advice.
Bill Wellbaum
British Auto Club of Las Vegas
----- Original Message -----
From: Jonas Payne
To: Bill Wellbaum ; Bill Wellbaum ; billwellbaum@lvcfs.com
Sent: Thursday, July 21, 2011 7:47 PM
Subject: TR3 Transmission
Bill,
To bend your ear a bit
Here's what my thought was, but I don't think it will work.
I have a fully rebuilt TR4 transmission sitting on the floor of my garage.
-
non overdrive. It is fully synchronized and works beautifully.
I have a broken 1959 overdrive TR3 transmission in the car.
In a perfect world, I'd remove the broken unit, separate the OD, remove the
tailpiece from the good gearbox, bolt the OD to it and reinstall - about 6
hours worth of work and back in business.
As near as I can tell the OD units for all TR3/4s were "Type A" and
identical.
Unfortunately, it would appear that the mainshaft for OD transmissions were
not the same as OD transmissions on TR3 transmissions. I have no idea
whether or not this was the case for the fully synchronized TR4 unit I have.
Thus the question to post to the TR Web if you would for me.
Can I bolt an OD from a TR3 up to a TR4 non OD transmission? If not, what
would be required to do so.
My research is telling me that I need to get a longer mainshaft for an OD
TR4
and install it in my rebuilt TR4 trans, which is equally as much work as
what
will likely be required with the existing broken trans.
Other minor benefits to my rebuilt trans are:
Tilton hydraulic throwout bearing - ready to go.
MGB pressure plate for aforementioned bearing
TR4 clutch disc - much better than TR3 unit.
Question is - can this be done?
Then we get to the ethical dilemma - am I buggering up a numbers matching
car
to gain synchro in 1-2?
Jonas Payne
Director of Preconstruction
Thor Construction
PH: (702) 269-2007
Fax: (702) 269-7095
Cell: (702) 358-5084
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