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-----Original Message-----
From: Jack Brooks [SMTP:brooks@belcotech.com]
Sent: Wednesday, May 10, 2000 9:26 AM
To: jwheeler@seidata.com
Subject: RE: TRanny's
Jack,
Thanks for the detailed response. Following are one or two questions which
are confusing me:
> 2. Will the later steel bushed TR6 gearbox boltup to the A-type OD?
> [Jack Wheeler]
> Yes, with the correct mainshaft and adapter plate, they bolt right up.
That mainshaft is my problem, I suspect. The TR4 OD shaft I have located
is
a good used one for $100.
[Jack Wheeler]
If it were me, I would use the TR-4 mainshaft and the brass top hat
bushings. This is the combination I used in my race car for 24 years, and
never had a failure. I think the top hat bushing failure is a high mileage
issue. I have never seen one fail after I have rebuilt a transmission and
maintained it properly.
I suspect I can get the later one from John
Esposito, (neat guy, I've been to his shop for a tech session) but I am
sure
it will be a whole bunch more expensive.
[Jack Wheeler]
He wants $250, plus a core (stock) mainshaft.
This is OK, IF the steel top hat
bushings justify the other shaft. This is still an issue I am wrestling
with. Please let me know what you think, if you feel comfortable with
making a judgement. The bottom line was that I was unsure if I could get a
mainshaft that I could use with both the steel tophat bushings and the
A-type OD. I believe you are dismissing this concern.
> Is the steel tophat's OD
> mainshaft available?
> [Jack Wheeler]
> The only difference in the mainshafts is the diameter of the nose of the
> shaft which goes into the bearing in the input shaft gear. The
> later TR-6
> transmissions (with the slide in bearings in the input shaft gear) used a
> mainshaft with a nose diameter of about .835". All of the earlier models
> (including early TR-6's) had a pressed in bearing in the input
> shaft gear,
> and used a shaft with a pilot diameter of approximately .870".
> Both shafts
> are available from John Esposito in Connecticut, or from England.
OK, so the A and J type OD's take a common input????
[Jack Wheeler]
No, the mainshaft for an A-Type is different than the one for the J-Type.
However, the A-type mainshaft will fit the later gearboxes. Therefore, if
you have a later gearbox (with the steel top hat bushings), you can
disassemble the gearbox, install an A-Type mainshaft (must have the .835
nose diameter) and use it with an A-Type overdrive.
I ask because the
later TR6 boxes used J-types, not A's. The TRF book shows the different
sized needle bearings only.
BTW - Have you considered replacing the needle bearings with bushings?
[Jack Wheeler]
I believe that would be a step backwards. The TR-2's and early TR-3's used
a bushing, where the mainshaft fits into the input shaft. It was
subsequently replaced by the needle bearing. Must have been a reason for
making that change - surely the needle bearing cost more than the bushing!
Thanks,
Jack Brooks
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