Some Other differences:
Later cars had more gusseting on the frame to reduce cracking
in the known weak spots on the chassis; Brake fittings went from
English to metric; Fan design changed to improve cooling; Overdrive
went from A type to J type; Headrests were changed to removable;
Changes made to transmission for durability; Additional warning
lights added to instruments; Interior lighting changed from
transmission tunnel to under dash courtesy lights; steering wheel
design and size changes; Engine block deck changed (requires
different head gasket); Exhaust valve was made smaller; Improved
port design in the cylinder head; Side impact door beams added;
Bumper heights raised, rubber baby buggy bumpers added;
windshield frame changed to black; headlight dimmer switch moved
to steering column; More aggressive cam added; Compression ratio
was lowered for emissions;
... and probably a whole lot more I can't remember.
Whew!
Vance
------------------------------
1974 Mimosa Yellow Triumph TR6
Cogito Ergo Zoom
(I think, therefore I go fast)
-----Original Message-----
From: Richard Seaton [mailto:rsh17@msn.com]
Sent: Saturday, January 04, 2003 12:09 PM
To: Bernie; Web_disscusion List
Subject: Re: More early-vs-late stuff: instruments
Bernie,
I've read in Roger William's book (page 134, col 1, paragraph 3) "How to
Restore Triumph TR5/250 & TR6" that there is a difference in the trailing
arm
castings, but I've never seen this referred to anywhere else. So I can't say
for sure if there was a change. I've got an early 6 and some latter trailing
arms, but there wasn't a noticeable difference. The emphasis being on
noticeable. Note -The rear springs were changed at this point too.
So, sorry I can't venture to answer your question.
William's does state there is a date code somewhere on the TA .
Richard
----- Original Message -----
From: Bernie
Sent: Saturday, January 04, 2003 1:44 PM
To: Richard Seaton
Subject: Re: More early-vs-late stuff: instruments
Richard I was reading your response and the issue that really caught my eye
is the Trailing Arms, can one not use the trailing arms for all years
regardless of the year of manufacture?
Bernie
----- Original Message -----
From: Richard Seaton <rsh17@msn.com>
To: Doug Dwyer <dougdwyer@earthlink.net>; Web_disscusion List
<6pack@autox.team.net>
Sent: Saturday, January 04, 2003 1:07 PM
Subject: Re: More early-vs-late stuff: instruments
> Doug,
>
> There was a cam difference in about '73, to a milder cam.
> Exhaust manifold change to two 3 into 1.
> Narrow spacing on the head. I think this is only on '69 TR6's, but I'm not
> sure.
> Sometime the intake was changed to a straighter flow to the head, I'm not
sure
> when this took place.
> "long" crank for '69's and TR250's, This long area is the machined part
that
> connects to the flywheel. There for the flywheels are different too.
> Prettier bumpers on the pre-74 or 73.
> Brass bushing in the earlier transmissions, not sure when they changed to
> steel.
> A type O/D (2nd, 3rd & 4th) for early 6's, J type o/d (3rd & 4th).
> Trailing arm brackets changed One notch inner and two notch outer for up
to
> CC61570. 3 notch inner and 2 notch outer from CC61571.
> A few distributor and carb changes.
> alternator changes
> water pump pulley differences
> Sorry I can't give you the commission #'s when the changes occurred, but
you
> can look in the Moss or TFR catalogues for that.
>
> I think the only performance differences are the camshaft, intake and
> exhaust manifold changes. This is what you are really wanting to know
isn't
> it?
>
> Not to mention the 1969 TR6's just look better than the latter ones!!!!
LOL
> I'm sure I'm setting myself up for feedback on this one!
>
> Richard Seaton
> '69 TR6 CC27413L(O)
>
> ----- Original Message -----
> From: Doug Dwyer
> Sent: Saturday, January 04, 2003 11:15 AM
> To: TR6 List
> Subject: More early-vs-late stuff: instruments
>
> Thanks to all who helped with my early-vs-late bumper questions. Now....
>
> Can the earlier style instruments be directly swapped into a late dash ? I
> don't care for the later style with the bright bezels.
>
> Emission controls aside, are there any other serious considerations
between
> early and late cars? Of course, I'm hoping everyone will say "no"......
>
> My idea of course, is to broaden my search criteria in hopes of finding
the
> right car. If a few relatively minor (and easy) changes will make a late
car
> essentially the same as an early car, well, I've greatly increased the
> number of candidates as the late cars seem much more plentiful.
>
> Thanks again
>
> The pest,
> Doug Dwyer
> Longview, Washington USA
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