Bill,
The early (banjo-style) MGB rear axle will fit into the MGA with no
difficulty. Using the later style (Salisbury) will require modification to
the handbrake linkage. However, if you find an MGB banjo axle, you can
simply transfer the diff. unit to your MGA housing and not worry about track
changes, wheel offsets, brakes, etc.
If your MGA is an early car, the splines in the diff where the axle fits
will be different from the B but you can use the spider gears from the A
diff in the B diff when you change the thrust washers - probably something
you should do when installing a used rear end anyway.
Lawrie
British Sportscar Center
----- Original Message -----
From: Bill King <kingwj@del.net>
To: <mgs@autox.team.net>
Sent: Wednesday, November 01, 2000 1:23 PM
Subject: rear end question
> Is it possible and practical to put the 3.909:1 MGB rear axle into a MGA?
> The only 'official' ratios listed for the A are the standard 4.30:1 and an
> optional 4.555. It's my theory that a motor will rev a certain
> predetermined number of times as determined by an unknown force and
> therefore it is to my benefit to get the greatest number of miles out of
> those revs. My car already has a B motor so the power is there for the
> longer gear. The manuals list the rear tracks as:
> A- 48 3/4" (disk wheel)
> B- 49 1/4" (any wheel)
> My question is are the brake drums .25" wider on the B so that mounting my
> original brakes will bring the track back to correct. Also drive shaft
> lengths are different, which is not unexpected. Is this a project worth
> taking on or should I just forget about it?
> Comments please
> Regards,
> Bill King
> 59 A
>
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