requesting real life experience with 904 lock-up with manual switch

Dana67Dart said

Just out of curiosity...

Why do you want a lock up converter?

If it is for MPG you may never make your investment back in savings in your life time. Just my 2 cents

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What's the disadvantage? It's not just the MPG, but less wear and tear, less noise.....what's not to like? Plenty of companies offer high performance lockup converters. If the transmission has that feature, why not use it?