I have read about the brake upgrades swapping rear ends with 94-98. I have also read about the T -bird SC rear end swap. Just wondering first of all would I be better off in the long run to do the 5 lug rear end or stay with the 4 lug. I would like to keep my GT as stock looking from the out side appearance as I can. Second I really don't want to start swapping parts, retrofitting, and having wheel clearance issues especially when the potential problems are dealing with my brakes. My GT has 54k original miles and I have replaced both rear wheel cylinders and but new brakes on, and actually I don't have any issues with the drum brakes they are easy to work with. My issue is that I would like to slowly start getting my 89 into the 21st century. If I want to go faster I feel I should be able to stop faster. I also don't have problems going to the bone yard or buying a car for parts if everything will match up. I just don't want to start tearing my perfectly fine running 89 up and start having issues. I have seen some rear disk brake kits out there and they aren't cheap. Just want an opinion about going 5 lug or staying 4 lug. Also it seems the SC 4 lug will bolt right under, but the 94-98 rear definitely will and calipers can be upgraded but 5 lug and 17 inch rims. The cost of new rims and tires would probably offset the rear brake conversion kit? My 89 has 91 pony rims. I like the upgrade to 16 inch, I don't think 17 inch rims will clear.