Progress:
Some shots of when I was installing the mini-spool:
Here I've got the diff already out of the carrier and the ring gear and side gears & pin removed.
Here's the differential with the mini spool snuggly entombed in it ready to do what it was born to do: THRILL!!!
We'll have to see how the stock SR5 axles hold up to the "throttling" they're about to get

.
BC Racing rear springs
AJPS adjustable rear spring perches
Fuel pump and fan relay & switches
Fans and shroud mounted, wired up and running
Updated furnace shot
SR5 driveshaft (lengthened by an inch) slips perfectly into the RX7 transfer case
The I.D. and spline count of the split yoke are identical - 20:2 spline count.
Complete SR5 factory rear end. I installed a mini-spool into the rear end.