My 1961 TR4 has the 1/4" flange and is full synchro.
Brad
CT288L
Sent from my iPhone
On Jun 17, 2009, at 7:19 PM, "Randall" <tr3driver@ca.rr.com> wrote:
>> If you measure the thickness of the bell housing flange
>> that
>> bolts to the engine, it is about 3/8 of an inch thick on the early
>> transmissions
>> but close to 1/2 inch or more on the later transmissions! Much
>> stronger! I
>> don't
>> know when this change occurred, but my guess is it changed when the
>> gear
>> box
>> went to a synchro 1st gear.
>
> I believe it changed more than once. The TR2-3 version was only
> perhaps
> 1/4". I don't recall it getting thicker when the 4-synchro box was
> introduced with the TR4 (and some TR3B), but perhaps it did. Then
> it got
> thicker when the 6-cylinder TR5/250 was introduced; and again at
> least once
> sometime during TR6 production. I believe one of those changes was
> when
> they tried to rationalize transmission parts between the TR6 and
> Stag. The
> castings were the same, but the Stag casting is machined differently
> (to
> accommodate the roller thrust bearings on the countershaft).
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