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what is a good torque converter lock up controller, im looking to buy one soon just not sure what to get.

my boss was woundering how to get better mpg's out of our state truck. it's a f550 flat bed. but he is also worryed about the warrenty. what dose it need to get better fuel econamy. and we cant touch the emissions

Just saying hi. Hoping this site will help me get into the low 13s this summer. I have allot of questions to be asking in the near future