I have a 98.5 2500 24v 4wd diesel. My lock out torque conv. will not stay locked up. I have had trouble with it going in and out, then I put the DTT noise filter on and the trans. worked perfect for two years. This problem just feels different. I have aftermarket exh, edge 5 stage box, htt turbo, edge stage 3 inj nozzles, tourque conv lockup swith ( it done it a few times even witn the switch on ), and afe cold air intake. the truck has 158,000 miles on it. Do you think the conv is going out?