OK guys I need help here im setting up a 1990 Ford Ranger XLT just installed ANA 5 spoke 15" rims KYB Mono max sport shocks, K&N inbox Filter (soon lower the van 3")

I Just however purchased a Ford Tunderbird 2.3L Turbo engine but i wanted to do 3 other thing before i drop in the engine

Were im having trouble is the Diff!! I want a limited slip Diff dont know were to start is there a Limited slip diff in any other ford that would work in the RWD Ranger XLT back end???
If i cant find one the backup plan is to Weld my exsisting Diff solid but i really really dont want to do that so if any one can help me with Info Please!!!!



This is My Goal hopfuly I can Get 250hp when im done
http://www.sdsefi.com/features/july00ranger.htm

 

Heres a Picture of the Pickup as it is now I plan to take off the Camper off the back and put a Cover instead also plan to lower it 3-4 inches