[Healeys] Healey BN-1 rear

David P frogeye at porterscustom.com
Thu May 9 13:26:16 MDT 2019

Austin America convertibles were fitted with a 3.666666:1 differential. 
Direct exchange should you find one.. Best chance is probably the UK.

On 5/9/2019 1:18 PM, Curtis Arndt 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.
> Cheers,
> Curt
> On Wed, May 8, 2019 at 2:25 PM Wayne Schultz <waschu2 at gmail.com 
> <mailto: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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