53/13 rear end gears.

Unknown

Right, I hope you are sitting down before you read
this!   The ball-park figure for getting 20 sets of gears machined
will be in the vicinity of $2,500 per set. Those who still wish to proceed
with investigations please let me know and I'll take steps to send the 
gears to the machine shop.  For this sort of operation I will require money
up-front, and you  will just have to trust me that I will carry out the
job.  I would put this money in a special account until the job is done.

The alternatives are to investigate modifying some
other type of rear end to fit in our housings.  I know of  one Hudson
 8 owner here who fitted a Toyota Crown  4:1 ratio complete  diff
head into his housing, with an adapter plate and spacer to get the necessary
alignmnent

Geoff .