[Healeys] Healey BN-1 rear
michael.salter at gmail.com
Fri May 10 06:15:40 MDT 2019
Hi Wayne, I have a 3.55/ 1 ratoi in the spiral bevel differential of my
early BN1. Mine is from an Austin Atlantic convertible, the fixed head used
a different ratio.
This was an available option for the BN1 and was supplied with a 140MPH
With the 28% overdrive it is an ideal combination for modern roads
providing 70 MPH cruising at under 3000 RPM.
I believe that Dennis Welsh have the crownwhell an pinion set available for
the 3.55/1 ratio.
It is a relatively easy installation if you are familiar with differential
On Thu, May 9, 2019, 9:18 PM Curtis Arndt, <cnaarndt at gmail.com> wrote:
> 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.
> 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
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