I was going to pay $800 or something for a ratio change and LSD conversion with fully recoed parts. However, through some sources I may be able to push it under $700 as part of a group buy.
Hope this gives you some guide. Considering people pay $400-500 for a secondhand 3.45 LSD of unknown condition plus the inconvenience of installation, it makes pretty good sense.
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S