I know Kultulz has info on upgrades for 8-inch rears. If you PM him he will help. I opted to go with a 9-inch, instead of building my stock 8-inch. I found a 9-inch donor at the bone yard from an old MachI for $80.00. Bought a set of 3.70 Precision gears for $179.95 and a Traction Lok dif. for $369.95. Through in some bearings, seals, etc. and I had a fresh 9-inch for about $800.00 complete. I also had to have a driveshaft made. Not exactly pocket change but I don't think I'll ever have to worry about my rear again. I got my parts from <a href="http://www.ReiderRacing.com" target="_blank">www.ReiderRacing.com</a> . I don't know if they have much for 8-inch rears but they have an 800 number that you could call.
BUILT FORD TOUGH