Subject: Re: [TR] 4A upper A arms

From: Cliff Hansen <[email-masked]>
Date: Mon, 18 May 2026 01:06:12 +0000

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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 <[email-masked]> on behalf of dave northrup=
 <[email-masked]>
Sent: Sunday, May 17, 2026 4:27 PM
To: list Triumph <[email-masked]>
Subject: [TR] 4A upper A arms

I am converting my 3A to 4A front suspension using 4A upper A arms.  I boug=
ht them from a breaker, and as i clean them up i notice that 2 of the 4 arm=
s have L on one side and R on the other. Yes, left and right, but beyond th=
at I don't understand.   And the other 2 A arms have no marking

How do i install these A arms?

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<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
The longer arms are the rears.</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
I think the letters are on the shorter (front) arms.</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
The letter faces up. L up on the left side, R up on the right side.</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Cliff</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Triumphs &lt;triumphs=
[email-masked]&gt; on behalf of dave northrup &lt;[email-masked]=
&gt;<br>
<b>Sent:</b> Sunday, May 17, 2026 4:27 PM<br>
<b>To:</b> list Triumph &lt;[email-masked]&gt;<br>
<b>Subject:</b> [TR] 4A upper A arms</font>
<div>&nbsp;</div>
</div>
<div dir=3D"auto">I am converting my 3A to 4A front suspension using 4A upp=
er A arms.&nbsp; I bought them from a breaker, and as i clean them up i not=
ice that 2 of the 4 arms have L on one side and R on the other. Yes, left a=
nd right, but beyond that I don't understand.&nbsp;
 &nbsp;And the other 2 A arms have no marking
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">How do i install these A arms?</div>
</div>
</body>
</html>

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** [email-masked] **

Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

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From: Randy and Valerie DeRuiter <[email-masked]>
Date: Mon, 18 May 2026 13:38:36 +0000

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Nope - longer arms are the fronts - that angles the vertical link backwards=
 to give the 3 degrees of castor.  And Dave you will need TR4 trunnions wit=
h the castor built in to finish this.
________________________________
From: Triumphs <[email-masked]> on behalf of Cliff Hansen =
<[email-masked]>
Sent: Sunday, May 17, 2026 8:06 PM
To: dave northrup <[email-masked]>; list Triumph <[email-masked]=
Subject: Re: [TR] 4A upper A arms

Cliff

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<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Nope - longer arms are the fronts - that angles the vertical link backwards=
 to give the 3 degrees of castor.&nbsp; And Dave you will need TR4 trunnion=
s with the castor built in to finish this.&nbsp;&nbsp;</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Triumphs &lt;triumphs=
[email-masked]&gt; on behalf of Cliff Hansen &lt;cliff_hansen@outl=
ook.com&gt;<br>
<b>Sent:</b> Sunday, May 17, 2026 8:06 PM<br>
<b>To:</b> dave northrup &lt;[email-masked]&gt;; list Triumph &lt;triumph=
[email-masked]&gt;<br>
<b>Subject:</b> Re: [TR] 4A upper A arms</font>
<div>&nbsp;</div>
</div>
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<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
The longer arms are the rears.</div>
<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
I think the letters are on the shorter (front) arms.</div>
<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
The letter faces up. L up on the left side, R up on the right side.</div>
<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
Cliff</div>
<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div id=3D"x_appendonsend"></div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"x_divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" =
color=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Triumphs &lt;triump=
[email-masked]&gt; on behalf of dave northrup &lt;[email-masked]=
om&gt;<br>
<b>Sent:</b> Sunday, May 17, 2026 4:27 PM<br>
<b>To:</b> list Triumph &lt;[email-masked]&gt;<br>
<b>Subject:</b> [TR] 4A upper A arms</font>
<div>&nbsp;</div>
</div>
<div dir=3D"auto">I am converting my 3A to 4A front suspension using 4A upp=
er A arms.&nbsp; I bought them from a breaker, and as i clean them up i not=
ice that 2 of the 4 arms have L on one side and R on the other. Yes, left a=
nd right, but beyond that I don't understand.&nbsp;
 &nbsp;And the other 2 A arms have no marking
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">How do i install these A arms?</div>
</div>
</div>
</body>
</html>

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From: DAVE HOGYE <[email-masked]>
Date: Mon, 18 May 2026 08:20:17 -0700 (PDT)

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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 <[email-masked]> wrote:
>  
>  
> ---------------------------------------------
> From: Triumphs <[email-masked]> on behalf of dave northrup <[email-masked]>
> 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
>  
> Donate: http://www.team.net/donate.html
> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/[email-masked]
> 

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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.&nbsp; This tilts the upright reward for 3 degrees of caster.&nbsp; So the long arm or the one with more of an arc is the front arm.&nbsp; The shorter/straighter arm is the rear arm.&nbsp; This must be stated in a repair manual somewhere.&nbsp; 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.&nbsp; 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.&nbsp;&nbsp;</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.&nbsp; TR4As and TR6s used the same upper arms, but different design lower arms, trunnions and upright.&nbsp;&nbsp;</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.&nbsp; The calipers are much lighter weight and much less expensive and more readily available, and more choices of brake pads.&nbsp;</span>
  </div> 
  <div class="default-style" style="font-size: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;">
   &nbsp;
  </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 &lt;[email-masked]&gt; wrote:
   </div> 
   <div>
    &nbsp;
   </div> 
   <div>
    &nbsp;
   </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;">
    &nbsp;
   </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;">
    &nbsp;
   </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;">
    &nbsp;
   </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;">
    &nbsp;
   </div> 
   <div id="appendonsend">
    &nbsp;
   </div> 
   <hr style="display: inline-block; width: 98%;" tabindex="-1"> 
   <div id="divRplyFwdMsg" dir="ltr">
    <span style="font-size: 11pt; color: #000000; font-family: Calibri, sans-serif;"><strong>From:</strong> Triumphs &lt;[email-masked]&gt; on behalf of dave northrup &lt;[email-masked]&gt;<br><strong>Sent:</strong> Sunday, May 17, 2026 4:27 PM<br><strong>To:</strong> list Triumph &lt;[email-masked]&gt;<br><strong>Subject:</strong> [TR] 4A upper A arms</span> 
    <div>
     &nbsp;
    </div> 
   </div> 
   <div dir="auto">
    I am converting my 3A to 4A front suspension using 4A upper A arms.&nbsp; 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.&nbsp; &nbsp;And the other 2 A arms have no marking 
    <div dir="auto">
     &nbsp;
    </div> 
    <div dir="auto">
     How do i install these A arms?
    </div> 
   </div> ** [email-masked] **
   <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/[email-masked]
  </blockquote>
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From: Cliff Hansen <[email-masked]>
Date: Mon, 18 May 2026 16:21:21 +0000

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Thanks for correcting my error, Randy - I should not have relied on memory =
there.

Cliff

________________________________
From: Randy and Valerie DeRuiter <[email-masked]>
Sent: Monday, May 18, 2026 6:38 AM
To: Cliff Hansen <[email-masked]>; dave northrup <[email-masked]=
m>; list Triumph <[email-masked]>
Subject: Re: 4A upper A arms

Cliff

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<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Thanks for correcting my error, Randy - I should not have relied on memory =
there.</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Cliff</div>
<div class=3D"elementToProof" style=3D"font-family: Calibri, Helvetica, san=
s-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Randy and Valerie DeR=
uiter &lt;[email-masked]&gt;<br>
<b>Sent:</b> Monday, May 18, 2026 6:38 AM<br>
<b>To:</b> Cliff Hansen &lt;[email-masked]&gt;; dave northrup &lt=
;[email-masked]&gt;; list Triumph &lt;[email-masked]&gt;<br>
<b>Subject:</b> Re: 4A upper A arms</font>
<div>&nbsp;</div>
</div>
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<div class=3D"x_elementToProof" style=3D"font-family:Calibri,Helvetica,sans=
-serif; font-size:12pt; color:rgb(0,0,0)">
Nope - longer arms are the fronts - that angles the vertical link backwards=
 to give the 3 degrees of castor.&nbsp; And Dave you will need TR4 trunnion=
s with the castor built in to finish this.&nbsp;&nbsp;</div>
<div id=3D"x_appendonsend"></div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"x_divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" =
color=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Triumphs &lt;triump=
[email-masked]&gt; on behalf of Cliff Hansen &lt;cliff_hansen@ou=
tlook.com&gt;<br>
<b>Sent:</b> Sunday, May 17, 2026 8:06 PM<br>
<b>To:</b> dave northrup &lt;[email-masked]&gt;; list Triumph &lt;triumph=
[email-masked]&gt;<br>
<b>Subject:</b> Re: [TR] 4A upper A arms</font>
<div>&nbsp;</div>
</div>
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<div class=3D"x_x_elementToProof" style=3D"font-family:Calibri,Helvetica,sa=
ns-serif; font-size:12pt; color:rgb(0,0,0)">
The longer arms are the rears.</div>
<div class=3D"x_x_elementToProof" style=3D"font-family:Calibri,Helvetica,sa=
ns-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div class=3D"x_x_elementToProof" style=3D"font-family:Calibri,Helvetica,sa=
ns-serif; font-size:12pt; color:rgb(0,0,0)">
I think the letters are on the shorter (front) arms.</div>
<div class=3D"x_x_elementToProof" style=3D"font-family:Calibri,Helvetica,sa=
ns-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div class=3D"x_x_elementToProof" style=3D"font-family:Calibri,Helvetica,sa=
ns-serif; font-size:12pt; color:rgb(0,0,0)">
The letter faces up. L up on the left side, R up on the right side.</div>
<div class=3D"x_x_elementToProof" style=3D"font-family:Calibri,Helvetica,sa=
ns-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div class=3D"x_x_elementToProof" style=3D"font-family:Calibri,Helvetica,sa=
ns-serif; font-size:12pt; color:rgb(0,0,0)">
Cliff</div>
<div class=3D"x_x_elementToProof" style=3D"font-family:Calibri,Helvetica,sa=
ns-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div id=3D"x_x_appendonsend"></div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"x_x_divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif=
" color=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Triumphs &lt;triu=
[email-masked]&gt; on behalf of dave northrup &lt;dave@ranteer=
.com&gt;<br>
<b>Sent:</b> Sunday, May 17, 2026 4:27 PM<br>
<b>To:</b> list Triumph &lt;[email-masked]&gt;<br>
<b>Subject:</b> [TR] 4A upper A arms</font>
<div>&nbsp;</div>
</div>
<div dir=3D"auto">I am converting my 3A to 4A front suspension using 4A upp=
er A arms.&nbsp; I bought them from a breaker, and as i clean them up i not=
ice that 2 of the 4 arms have L on one side and R on the other. Yes, left a=
nd right, but beyond that I don't understand.&nbsp;
 &nbsp;And the other 2 A arms have no marking
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<div dir=3D"auto">How do i install these A arms?</div>
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