The 1955 and 1956 Mercurys used a Dana/Spicer 45 rear end with a 8,75" ring. The Dana/Spicer 45 was also used in the Packards and some Chevy trucks (then with 6 bolts axles).

Anyone knows which parts that are interchangeable between the 45's and the 44's?
Can I use a limited slip differential from a Packard in a Mercury rear end?
Can I use a 44 limited slip in a 45 rear end?

The Dana/Spicer 45 should be stronger than the 44. Is that true? Has anyone broke a Dana/Spicer 45?

1955 Mercury