My gen III coupe with a TKO600 5 speed developed a leak at about 1500 miles and the 4th gear synchro won't allow me to downshift from O.D. I guess this has too many miles on it for tremec to warranty. My question... is there another brand trans that guys are using or is there a dependable person in central/northern Wisconsin that could repair this? It's no good to me the way it is so I'd even consider repairing it myself if there is a guide or instructions available. Thanks