[Healeys] RE; Early bn1 axle 4 stud problems

[Bob Spidell]

A bit of tangent, but a question for the gurus: There are basically two 
types of LSDs: clutch-pack type, which is most common, and 'mechanical' 
types, most common being Torsen (I assume we're talking about a 
clutch-pack type here). The clutch-pack type essentially locks the two 
axles together for straight-line traction, but gives enough to allow the 
rear wheels to rotate at different rates, for turning. Torsen uses 
complex gearing to somehow sense torque differences to allow the rear 
wheels to work independently when necessary.

The clutch-pack type, like any clutch, has friction plates that wear and 
eventually need replacing, and the additives--sometimes called 'friction 
modifiers'--allow more slippage, which kind of obviates the purpose of 
the LSD, which is to allow us to do two-wheel burnouts in our Healeys, 
right? My '08 Mustang, when new, would sometimes get a bit 'grabby' in 
hard (for a non-racer, cornering) but by the time I traded it in at 112K 
miles I felt it had lost most of this characteristic, but it was hardly 
noticeable most of the time. But, my '19 Mustang with Torsen sometimes 
gets a bit grabby in corners, too.

So, for a daily driver, what is the advantage of an LSD (esp. with a 
clutch-pack type, which will eventually need disk replacement)? And, how 
do you know when your clutch disks are shot, except that you can't do 
two-wheel burnouts? In my Healeys I use Redline EP gear oil, which comes 
with or without the friction modifier, which can also be added from a 
separate bottle (sometimes I buy the 'wrong' stuff but, without LSDs I 
don't think it makes a difference).


On 3/30/2022 5:21 AM, Michael Salter via Healeys wrote:
> Hi Allan, we encountered exactly the same issue with AHX12 during it's 
> first Targa Newfoundland.
> A long-time performance rallyer solved the problem for us completely 
> by recommending that we add half a bottle of A C Delco Limited Slip 
> Differential Lubricant Additive Part # 992694.
> This additive immediately and completely eliminated the low speed 
> shudder and jumping issues.
>
> M
>
> On Wed., Mar. 30, 2022, 1:39 a.m. Allan Peters via Healeys, 
> <healeys at autox.team.net> wrote:
>
>     I have a 1954  Bn1  with a 4 stud , presumably  spiral bevel 
>     axle.  It currently has an LSD which  does not like parking 
>     manoevers.  Any  tght lock and the wheels are jumping  around 
>     !!!!  As a quick fix am thinking  a used  diff would be  the
>     answer.So my question is does anyone on the list have one of these
>     Diffs.  please  ??  Any advice very welcome  !!   Have been 
>     filling and sanding a  UVL hardtop for weeks now so need to try
>     and erase it from my mind
>                                               Cheers !!     Allan
>
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