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TR4s after CT6344 VIN, used 3 degree trunnions and the upper arms that you
have. This tilts the upright reward for 3 degrees of caster. So the long arm
or the one with more of an arc is the front arm. The shorter/straighter arm is
the rear arm. This must be stated in a repair manual somewhere. But, if you
mock up the suspension with the 3 degree trunnion, upright, ball joint and the
spring pan in place, the arm placement should be obvious, because the upright
with the upper ball joint attached will not slip in place between the arms.
The suspension should be set up without the coil spring or shock to make sure
there is smooth, no binding operation while moving up and down and turning.
TR4s built before 6344 used the TR3 front suspension. TR4As and TR6s used the
same upper arms, but different design lower arms, trunnions and upright.
You can use TR4A-TR6 brake calipers and rotors (slightly smaller diameter) if
you change the caliper bracket on the earlier uprights. The calipers are much
lighter weight and much less expensive and more readily available, and more
choices of brake pads.
Dave H.
> On 05/17/2026 6:06 PM PDT Cliff Hansen <cliff_hansen@outlook.com> wrote:
>
>
> The longer arms are the rears.
>
> I think the letters are on the shorter (front) arms.
>
> The letter faces up. L up on the left side, R up on the right side.
>
> Cliff
>
>
>
> ---------------------------------------------
> From: Triumphs <triumphs-bounces@autox.team.net> on behalf of dave northrup
> <dave@ranteer.com>
> Sent: Sunday, May 17, 2026 4:27 PM
> To: list Triumph <triumphs@autox.team.net>
> Subject: [TR] 4A upper A arms
>
> I am converting my 3A to 4A front suspension using 4A upper A arms. I bought
> them from a breaker, and as i clean them up i notice that 2 of the 4 arms
> have L on one side and R on the other. Yes, left and right, but beyond that I
> don't understand. And the other 2 A arms have no marking
>
> How do i install these A arms?
> ** triumphs@autox.team.net **
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/triumphs/dlhogye@comcast.net
>
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<div style="font-size: 12pt; font-family: helvetica,arial,sans-serif; color:
#333333;">
<span style="font-family: helvetica; font-size: 12pt;">TR4s after CT6344
VIN, used 3 degree trunnions and the upper arms that you have. This tilts
the upright reward for 3 degrees of caster. So the long arm or the one
with more of an arc is the front arm. The shorter/straighter arm is the
rear arm. This must be stated in a repair manual somewhere. But, if
you mock up the suspension with the 3 degree trunnion, upright, ball joint and
the spring pan in place, the arm placement should be obvious, because the
upright with the upper ball joint attached will not slip in place between the
arms. The suspension should be set up without the coil spring or shock to
make sure there is smooth, no binding operation while moving up and down and
turning. </span>
</div>
<div class="default-style" style="font-size: 12pt; font-family:
helvetica,arial,sans-serif; color: #333333;">
<span style="font-family: helvetica; font-size: 12pt;">TR4s built before
6344 used the TR3 front suspension. TR4As and TR6s used the same upper
arms, but different design lower arms, trunnions and upright. </span>
</div>
<div class="default-style" style="font-size: 12pt; font-family:
helvetica,arial,sans-serif; color: #333333;">
<span style="font-family: helvetica; font-size: 12pt;">You can use TR4A-TR6
brake calipers and rotors (slightly smaller diameter) if you change the caliper
bracket on the earlier uprights. The calipers are much lighter weight and
much less expensive and more readily available, and more choices of brake
pads. </span>
</div>
<div class="default-style" style="font-size: 12pt; font-family:
helvetica,arial,sans-serif; color: #333333;">
</div>
<div class="default-style" style="font-size: 12pt; font-family:
helvetica,arial,sans-serif; color: #333333;">
<span style="font-family: helvetica; font-size: 12pt;">Dave H.</span>
</div>
<blockquote type="cite">
<div>
On 05/17/2026 6:06 PM PDT Cliff Hansen <cliff_hansen@outlook.com>
wrote:
</div>
<div>
</div>
<div>
</div>
<div class="elementToProof" style="font-family: Calibri, Helvetica,
sans-serif; font-size: 12pt; color: #000000;">
The longer arms are the rears.
</div>
<div class="elementToProof" style="font-family: Calibri, Helvetica,
sans-serif; font-size: 12pt; color: #000000;">
</div>
<div class="elementToProof" style="font-family: Calibri, Helvetica,
sans-serif; font-size: 12pt; color: #000000;">
I think the letters are on the shorter (front) arms.
</div>
<div class="elementToProof" style="font-family: Calibri, Helvetica,
sans-serif; font-size: 12pt; color: #000000;">
</div>
<div class="elementToProof" style="font-family: Calibri, Helvetica,
sans-serif; font-size: 12pt; color: #000000;">
The letter faces up. L up on the left side, R up on the right side.
</div>
<div class="elementToProof" style="font-family: Calibri, Helvetica,
sans-serif; font-size: 12pt; color: #000000;">
</div>
<div class="elementToProof" style="font-family: Calibri, Helvetica,
sans-serif; font-size: 12pt; color: #000000;">
Cliff
</div>
<div class="elementToProof" style="font-family: Calibri, Helvetica,
sans-serif; font-size: 12pt; color: #000000;">
</div>
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<span style="font-size: 11pt; color: #000000; font-family: Calibri,
sans-serif;"><strong>From:</strong> Triumphs
<triumphs-bounces@autox.team.net> on behalf of dave northrup
<dave@ranteer.com><br><strong>Sent:</strong> Sunday, May 17, 2026 4:27
PM<br><strong>To:</strong> list Triumph
<triumphs@autox.team.net><br><strong>Subject:</strong> [TR] 4A upper A
arms</span>
<div>
</div>
</div>
<div dir="auto">
I am converting my 3A to 4A front suspension using 4A upper A arms. I
bought them from a breaker, and as i clean them up i notice that 2 of the 4
arms have L on one side and R on the other. Yes, left and right, but beyond
that I don't understand. And the other 2 A arms have no marking
<div dir="auto">
</div>
<div dir="auto">
How do i install these A arms?
</div>
</div> ** triumphs@autox.team.net **
<br>
<br>Donate: http://www.team.net/donate.html
<br>Archive: http://www.team.net/pipermail/triumphs
http://www.team.net/archive
<br>
<br>Unsubscribe/Manage:
http://autox.team.net/mailman/options/triumphs/dlhogye@comcast.net
</blockquote>
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** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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