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I have a 1985 Ford B700 with a 429 and 5 speed and a 12 Bolt 19,000lb Eaton Rear Axle. I want better highway mileage than i have now and a higher top speed, right now it only goes 95km/h at about 4000RPM, Not cool!!! I want to put a two speed rear axle or just a rear carrier with the two speed in there, any one done anything like this? any info would be great! Even what kinda of speeds and RPM's you guys are running that already have them?