torque converter question

[albertarose]

Hi Every one !

My question is about Torque converters ..my friend says stock stall speed is best for street ..I have a big block fairly stock with a turbo 400 .. he also claims the turbo 350 is better than the turbo 400 for dependability and strength.. he also claims that torque converters wear out ..any one have any info I can use here ? what do you think about manual shift kits are they worth it? I have never been able to get my turbo 400 to kick down ..I have tryed using a factory swith set up but it did not activate it ..so i have always driven it without kick down working but it still goes pretty good any opinions to share ? thanks in advance...Leon