[Healeys] Healey BN-1 rear

[Curtis Arndt]

Hi Wayne,

First what do you mean by "early BN1?"  If it's the Spiral Bevel rear end,
then the standard 3.54 rear end conversion *will not work*.  These will
only work on the later BN1s with the Hypoid Bevel rear end starting at
chassis no. 221536 in Nov. '54.

That being said, maybe there is a lower gear option for the Spiral Bevel
unit, but if there is, I'm not aware of who might supply it.

BTW, my shop here in San Diego installed my Lempert 3.54 rear-end, and of
course rebuilt the whole unit while they had the thing apart.  Fortunately,
the shop had done a number of Healey conversions and was very familiar with
the process.  BTW, I have one of the very early BN1 Hypoid rear end units
with the filler plug on the carrier versus on the top of the pumpkin as on
the later cars, but there was no problem.

Anyone interested, I have an spare original 3.54 rear end that I picked up
20 years ago in Australia from my friend Rob Rowland at the Healey
Factory.  If interested, send me an email.

Cheers,

Curt

On Wed, May 8, 2019 at 2:25 PM Wayne Schultz <waschu2 at gmail.com> wrote:

> Does anyone have the specifications for installing a 3:5 or so gear set
> into an early BN-1 100-4 differential? I am looking for pinion preload and
> ring gear lash etc.My friend with his 100-4 spends a lot of time on the
> highway and would like to lower his rpm's at highway speeds. Denis Welch
> has the gearset needed, just would need specs, available of shims, bearings
> etc. I have done several conversions on Healey 3000's but the BN-1 third
> member is a different animal
>
>                                     Thanks
>                                      Wayne
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