2 speed rearends

You want a GV, instead of having no way to adapt them to diffs with no bolt on pinion housings, they bolt to the tail housings of the the trans...

The dana spicer was used in like 2 cars.... late 60's...

There is a company making a drop out dana 60, called the dana 69, it has kinda the same similar housing as a old 2 speed style.
Maybe if they're aware of how close there bolt in pinion section resembles the 2 speed that might be able to make a 2 speed optioned pinion section...

I never thought to call them and let them know about it...

However the GV is the newest design on that idea and it however can be used more advantageous over a 2 speed rear, the 2 speed rear is a engage it and use it that way, no dropping out of it until you come to a stop, where the GV is the best of all worlds and uses....

Some things die because there out dated...