[Healeys] Overdrive ratios

[Alan Seigrist]

That should be added to the concours guidelines!

On Wed, Jul 15, 2026 at 8:46 PM Harold Manifold <manifold at telus.net> wrote:

> 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.
>>
>>
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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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