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As I recall Hank the 100/6 also used the 28% overdrive, the same unit as th=
e BN2.
M
________________________________
From: Hank Leach <gradea1@charter.net>
Sent: Wednesday, 15 July 2026 13:47:08
To: Michael Salter <michael.salter@gmail.com>; healeys@autox.team.net <heal=
eys@autox.team.net>
Subject: RE: Re: [Healeys] Overdrive ratios
Overdrives for AH 100 were installed as follows:
OD 1260 (32%) was used up to 140204 (not practical in use)
OD 1292 was used on chassis 140205-228046
OD 1308 started at 1 to 228046
OD 1447 was used on chassis (BN2) 228047-230489 (with some exceptions)
Later cars, including BJ8 went to a 22% unit.
--------------------
From: "Michael Salter" <michael.salter@gmail.com>
To: <gradea1@charter.net>, <healeys@autox.team.net>
Sent: July 15, 2026 at 9:35 AM PDT
Subject: Re: [Healeys] Overdrive ratios
Thanks Hank. Very much appreciated.
M
________________________________
From: Hank Leach <gradea1@charter.net>
Sent: Wednesday, 15 July 2026 12:33:04
To: Michael Salter <michael.salter@gmail.com>; healeys@autox.team.net <heal=
eys@autox.team.net>
Subject: RE: [Healeys] Overdrive ratios
Michael- the 1260 is the early 32% OD. The 1292 is the 100 common 28% ratio=
. After that ODs for BN2s were 1308-28% and 1447-28%.
I actually have an OD case #105 but 288 is a low serial number. Regards, Ha=
nk
--------------------
From: "Michael Salter" <michael.salter@gmail.com>
To: <healeys@autox.team.net>
Sent: July 15, 2026 at 9:22 AM PDT
Subject: [Healeys] Overdrive ratios
I have 2 BN1 overdrives which I'm struggling to identify.
Unlike the later type "A" units the serial number on these is not prefixed =
with the ratio.
The serial numbers on these are :
1260/288
and
1292/2037
Anyone with information which would help identify the ratios of these?
Thanks.
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system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
3, 33, 33);">
As I recall Hank the 100/6 also used the 28% overdrive, the same unit as th=
e BN2.</div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(3=
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o, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(33, 33, 33);" =
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<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> Hank Leach <gradea=
1@charter.net><br>
<b>Sent:</b> Wednesday, 15 July 2026 13:47:08<br>
<b>To:</b> Michael Salter <michael.salter@gmail.com>; healeys@autox.t=
eam.net <healeys@autox.team.net><br>
<b>Subject:</b> RE: Re: [Healeys] Overdrive ratios</font>
<div> </div>
</div>
<div>
<div>Overdrives for AH 100 were installed as follows:</div>
<div>OD 1260 (32%) was used up to 140204 (not practical in use)</div>
<div>OD 1292 was used on chassis 140205-228046</div>
<div>OD 1308 started at 1 to 228046</div>
<div>OD 1447 was used on chassis (BN2) 228047-230489 (with some exceptions)=
</div>
<div> </div>
<div>Later cars, including BJ8 went to a 22% unit.</div>
<div><br>
-------------------- <br>
<br>
From: "Michael Salter" <michael.salter@gmail.com> <br>
To: <gradea1@charter.net>, <healeys@autox.team.net> <br>
Sent: July 15, 2026 at 9:35 AM PDT <br>
Subject: Re: [Healeys] Overdrive ratios </div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
Thanks Hank. Very much appreciated. </div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
M</div>
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tos,Aptos_MSFontService,-apple-system,Roboto,Arial,Helvetica,sans-serif; fo=
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MSFontService,-apple-system,Roboto,Arial,Helvetica,sans-serif; font-size:12=
pt; color:rgb(33,33,33)">
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ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
</div>
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<hr style=3D"display:inline-block; width:98%">
<div id=3D"x_divRplyFwdMsg"><strong>From:</strong> Hank Leach <gradea1@c=
harter.net><br>
<strong>Sent:</strong> Wednesday, 15 July 2026 12:33:04<br>
<strong>To:</strong> Michael Salter <michael.salter@gmail.com>; heale=
ys@autox.team.net <healeys@autox.team.net><br>
<strong>Subject:</strong> RE: [Healeys] Overdrive ratios
<div> </div>
</div>
<div>
<div>Michael- the 1260 is the early 32% OD. The 1292 is the 100 common 28% =
ratio. After that ODs for BN2s were 1308-28% and 1447-28%.</div>
<div> </div>
<div>I actually have an OD case #105 but 288 is a low serial number. Regard=
s, Hank<br>
-------------------- <br>
<br>
From: "Michael Salter" <michael.salter@gmail.com> <br>
To: <healeys@autox.team.net> <br>
Sent: July 15, 2026 at 9:22 AM PDT <br>
Subject: [Healeys] Overdrive ratios</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
I have 2 BN1 overdrives which I'm struggling to identify.</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
Unlike the later type "A" units the serial number on these is not=
prefixed with the ratio.</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
The serial numbers on these are :</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
1260/288</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
and</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
1292/2037</div>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
Anyone with information which would help identify the ratios of these?</div=
>
<div style=3D"font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Ar=
ial,Helvetica,sans-serif; font-size:12pt; color:rgb(33,33,33)">
Thanks.</div>
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