[Healeys] Overdrive ratios

[Harold Manifold]

Hi Michael,

I have attached a document from my archives regarding this topic. I believe
the information in it agrees with Hank's previous comments.

Best regards,
Harold

On Wed, Jul 15, 2026 at 4:17 PM Robert Markovich via Healeys <
healeys at autox.team.net> wrote:

> I thought they did use a .77 overdrive on the 100/6 as on the 100 BN2, but
> lessened it to a .82 (or so) unit on the 3000s. Along with a rear gear
> switch from 4.10:1 to 3.90:1.
>
>
> Sent from the all new AOL app for iOS
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>
> On Wednesday, July 15, 2026, 2:29 PM, Michael Salter <
> michael.salter at gmail.com> wrote:
>
> As I recall Hank the 100/6 also used the 28% overdrive, the same unit as
> the BN2.
>
> M
>
>
> ------------------------------
> *From:* Hank Leach <gradea1 at charter.net>
> *Sent:* Wednesday, 15 July 2026 13:47:08
> *To:* Michael Salter <michael.salter at gmail.com>; healeys at autox.team.net <
> healeys at 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 at gmail.com>
> To: <gradea1 at charter.net>, <healeys at 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 at charter.net>
> *Sent:* Wednesday, 15 July 2026 12:33:04
> *To:* Michael Salter <michael.salter at gmail.com>; healeys at autox.team.net <
> healeys at 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,
> Hank
> --------------------
>
> From: "Michael Salter" <michael.salter at gmail.com>
> To: <healeys at 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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