Try a bigger diameter wheel, it will make a difference.
I took the stock wheel out before I did all the power upgrades. Yes, a bigger wheel would help now, but I like my old Grant wood/chrome spoke wheel.
The pricing on the Strange site is $995, so that is pretty close to $1K. Thus I'm not going to purchase from them.
Strange S-Trac Differential
Fits 9″ Ford With 35 Spline Axles
Requires Aftermarket 3.250″ Bore Case
$995.00Yes, there are cheaper options, and I may look at them. Time will tell. I don't want to deal with junk, thus I put the spool in it years ago.