[Healeys] Overdrive ratios

[Michael Salter]

As I recall Hank the 100/6 also used the 28% overdrive, the same unit as the BN2.

M


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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.

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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
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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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