I have been doing some research into this same toopic and have found that a LSD from a pre-86 Supra will work in a Toyota 7.5" rearend. Also a Detroit Truetrac LSD (911A565) will work in this application, they make one specific for the Pickup 7.5" rearend. Check there website at
"
http://www.tractech.com/Products.htm".
I have seen them range in price from $350 to 450. Hope this helps.
