Subject: Re: [TR] TR3 bolt size?

From: Allen Hess <[email-masked]>
Date: Fri, 29 Aug 2025 17:10:37 -0400

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Hi Teri, First of all I have a 62 TR4, but I remember seeing a TR =
hardware catalog and I have found one on Triumph Experience. The nuts =
and bolts have part numbers and you will need a factory parts catalog to =
find those.=20

> I would like to replace the bolts that connects the mount to the plate =
on the frame
>=20
Aren't these studs integral to the trans rubber mount? If so I think it =
is a 7/16 fine thread nut
> and possibly the bolts that connect the frame plate to the frame.
>=20
these are ones that I can=E2=80=99t find but I would guess they are 3/8 =
fine thread and if not then 5/16. 3/4=E2=80=9D length=20

The big bolts trans to trans mount are #HB1112 1/2 x 1 1/2 fine, right =
side. #HB1115 is 1/2 x 1 7/8 left side when trans is fitted with the =
strap from bolt to gear shift.

Hopefully someone has a TR3 all apart and can give you a more definitive =
answer.
=EF=BF=BC
>=20
> From: "TeriAnn J. Wakeman" <[email-masked]>
> Subject: [TR] TR3 bolt size?
> Date: August 29, 2025 at 9:10:54=E2=80=AFAM EDT
> To: Triumph List <[email-masked]>
>=20
>=20
> My TR3 is currently my only functional vehicle and I need to replace =
the rear gearbox mount. Since the nearest hardware store is about 10 =
miles away I would like the swap to go quickly & smooth (yah right). I =
have a new mount & nuts that attach to the back of the gearbox. I would =
like to replace the bolts that connects the mount to the plate on the =
frame and possibly the bolts that connect the frame plate to the frame.
>=20
> Could someone please let me know what size bolts are need to fit the =
gearbox mount to the steel frame bracket? And the size bolt  that =
connects the steel frame bracket to the frame? Since the TR is my only =
transportation I would like to quickly get in get the replacement done & =
get back on the road (as if any project goes as planned).
>=20
> By the way, the U-joint part numbers I asked about earlier received a =
few replies all of which were obsolete numbers. Thank you to the people =
who took the time to reply and I suggest that you update your part =
numbers lists.
>=20
> My TR's 20+ year old U-joints were badly worn but I discovered a =
broken rear gearbox mount. Hopefully to be sorted out soon.
>=20
> My area's rainy season is due in the next month or so. It is getting =
to be time to remove the factory style luggage rack, polish it and place =
it into dry storage then get out the side curtains.
>=20
> My baby doll
>=20
>=20
>=20
>=20
>=20
> _______________________________________________
>=20
> Triumphs mailing list
> [email-masked]
> http://autox.team.net/mailman/listinfo/triumphs

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"overflow-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;">Hi Teri, First =
of all I have a 62 TR4, but I remember seeing a TR hardware catalog and =
I have found one on Triumph Experience. The nuts and bolts have part =
numbers and you will need a factory parts catalog to find =
those.&nbsp;<br =
id=3D"lineBreakAtBeginningOfMessage"><div><br></div><div><blockquote =
type=3D"cite"><p><font size=3D"4" face=3D"Adobe Garamond">I would like =
to replace the bolts that connects the mount to the plate on the =
frame</font></p></blockquote>Aren't these studs integral to the trans =
rubber mount? If so I think it is a 7/16 fine thread =
nut</div><div><blockquote type=3D"cite"><p><font size=3D"4" face=3D"Adobe =
Garamond">and possibly the bolts that connect the frame plate to the =
frame.</font></p></blockquote>these are ones that I can=E2=80=99t find =
but I would guess they are 3/8 fine thread and if not then 5/16. 3/4=E2=80=
=9D length&nbsp;</div><div><br></div><div>The big bolts trans to trans =
mount are #HB1112 1/2 x 1 1/2 fine, right side. #HB1115 is 1/2 x 1 7/8 =
left side when trans is fitted with the strap from bolt to gear =
shift.</div><div><br></div><div>Hopefully someone has a TR3 all apart =
and can give you a more definitive =
answer.</div><div></div></body></html>=

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"overflow-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: =
after-white-space;"><div><br><blockquote =
type=3D"cite"><div><br></div><div><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(127, 127, 127, 1.0);"><b>From: </b></span><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif;">"TeriAnn J. Wakeman" =
&lt;[email-masked]&gt;<br></span></div><div style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(127, 127, 127, 1.0);"><b>Subject: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;"><b>[TR] TR3 bolt =
size?</b><br></span></div><div style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px;"><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(127, 127, 127, 1.0);"><b>Date: </b></span><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif;">August 29, 2025 at 9:10:54=E2=80=AFAM =
EDT<br></span></div><div style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px;"><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(127, 127, 127, 1.0);"><b>To: </b></span><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif;">Triumph List =
&lt;[email-masked]&gt;<br></span></div><br><br>

 =20

    <meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3DUTF-8">
 =20
  <div><p><font size=3D"4" face=3D"Adobe Garamond">My TR3 is currently =
my only
        functional vehicle and I need to replace the rear gearbox mount.
        Since the nearest hardware store is about 10 miles away I would
        like the swap to go quickly &amp; smooth (yah right). I have a
        new mount &amp; nuts that attach to the back of the gearbox. I
        would like to replace the bolts that connects the mount to the
        plate on the frame and possibly the bolts that connect the frame
        plate to the frame.</font></p><p><font size=3D"4" face=3D"Adobe =
Garamond">Could someone please let me
        know what size bolts are need to fit the gearbox mount to the
        steel frame bracket? And the size bolt&nbsp; that connects the =
steel
        frame bracket to the frame? Since the TR is my only
        transportation I would like to quickly get in get the
        replacement done &amp; get back on the road (as if any project
        goes as planned).</font></p><p><font size=3D"4" face=3D"Adobe =
Garamond">By the way, the U-joint part
        numbers I asked about earlier received a few replies all of
        which were obsolete numbers. Thank you to the people who took
        the time to reply and I suggest that you update your part
        numbers lists.</font></p><p><font size=3D"4" face=3D"Adobe =
Garamond">My TR's 20+ year old
        U-joints were badly worn but I discovered a broken rear gearbox
        mount. Hopefully to be sorted out soon.</font></p><p><font =
size=3D"4" face=3D"Adobe Garamond">My area's rainy season is
        due in the next month or so. It is getting to be time to remove
        the factory style luggage rack, polish it and place it into dry
        storage then get out the side curtains.</font></p><p><font =
size=3D"4" face=3D"Adobe Garamond">My baby doll</font></p><p><font =
size=3D"4" face=3D"Adobe Garamond"><br>
      </font></p>
  </div>
<br><br>_______________________________________________<br><br>Triumphs =
mailing =
list<br>[email-masked]<br>http://autox.team.net/mailman/listinfo/=
triumphs<br></div></blockquote></div><br></body></html>=

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

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From: Dennis and Bridget <[email-masked]>
Date: Fri, 29 Aug 2025 16:59:59 -0600

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Just verified on my 61 TR3A project:  The bolts that connect the plate =
to the frame are 3/8 x 24 (fine thread). The ones that came with my car =
(probably factory - they have the =E2=80=9Ccorrect=E2=80=9D markings on =
the head) are 5/8=E2=80=9D in length, though 3/4=E2=80=9D length bolts =
would work just fine, and are probably easier to find locally.
Cheers, Dennis

> On Aug 29, 2025, at 3:10=E2=80=AFPM, Allen Hess =
>=20
>> I would like to replace the bolts that connects the mount to the =
plate on the frame
>>=20
> Aren't these studs integral to the trans rubber mount? If so I think =
it is a 7/16 fine thread nut
> these are ones that I can=E2=80=99t find but I would guess they are =
3/8 fine thread and if not then 5/16. 3/4=E2=80=9D length=20
>=20
> Hopefully someone has a TR3 all apart and can give you a more =
definitive answer.
> <Triumph hardware sizes.pdf>
>=20
>>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs  =
>=20
> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/triumphs/[email-masked]

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"overflow-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;">Just verified =
on my 61 TR3A project: &nbsp;The bolts that connect the plate to the =
frame are 3/8 x 24 (fine thread). The ones that came with my car =
(probably factory - they have the =E2=80=9Ccorrect=E2=80=9D markings on =
the head) are 5/8=E2=80=9D in length, though 3/4=E2=80=9D length bolts =
would work just fine, and are probably easier to find =
locally.<div>Cheers, Dennis</div><div><br></div><div><blockquote =
type=3D"cite"><div>On Aug 29, 2025, at 3:10=E2=80=AFPM, Allen Hess =
&lt;[email-masked]&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div><meta http-equiv=3D"content-type"=
 content=3D"text/html; charset=3Dutf-8"><div style=3D"overflow-wrap: =
break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi =
Teri, First of all I have a 62 TR4, but I remember seeing a TR hardware =
catalog and I have found one on Triumph Experience. The nuts and bolts =
have part numbers and you will need a factory parts catalog to find =
those.&nbsp;<br =
id=3D"lineBreakAtBeginningOfMessage"><div><br></div><div><blockquote =
type=3D"cite"><p><font size=3D"4" face=3D"Adobe Garamond">I would like =
to replace the bolts that connects the mount to the plate on the =
frame</font></p></blockquote>Aren't these studs integral to the trans =
rubber mount? If so I think it is a 7/16 fine thread =
nut</div><div><blockquote type=3D"cite"><p><font size=3D"4" face=3D"Adobe =
Garamond">and possibly the bolts that connect the frame plate to the =
frame.</font></p></blockquote>these are ones that I can=E2=80=99t find =
but I would guess they are 3/8 fine thread and if not then 5/16. 3/4=E2=80=
=9D length&nbsp;</div><div><br></div><div>The big bolts trans to trans =
mount are #HB1112 1/2 x 1 1/2 fine, right side. #HB1115 is 1/2 x 1 7/8 =
left side when trans is fitted with the strap from bolt to gear =
shift.</div><div><br></div><div>Hopefully someone has a TR3 all apart =
and can give you a more definitive answer.</div><div></div></div><span =
id=3D"cid:A39D4AC5-8595-4FF3-9FCB-63235813EB8A">&lt;Triumph hardware =
sizes.pdf&gt;</span><meta http-equiv=3D"content-type" =
content=3D"text/html; charset=3Dutf-8"><div style=3D"overflow-wrap: =
break-word; -webkit-nbsp-mode: space; line-break: =
after-white-space;"><div><br><blockquote =
type=3D"cite"><div><br></div><div><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(127, 127, 127, 1.0);"><b>From: </b></span><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif;">"TeriAnn J. Wakeman" =
&lt;[email-masked]&gt;<br></span></div><div style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(127, 127, 127, 1.0);"><b>Subject: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;"><b>[TR] TR3 bolt =
size?</b><br></span></div><div style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px;"><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(127, 127, 127, 1.0);"><b>Date: </b></span><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif;">August 29, 2025 at 9:10:54=E2=80=AFAM =
EDT<br></span></div><div style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px;"><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(127, 127, 127, 1.0);"><b>To: </b></span><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif;">Triumph List =
&lt;[email-masked]&gt;<br></span></div><br><br>

 =20

triumphs<br></div></blockquote></div><br></div>** =
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