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Message: [QUOTE="Jason, post: 339555, member: 430"] i think that 6 speed spicer may be too long winded between gears to be worth it, and would run out of steam quick. a 9 speed coukd work, if cheap enough, flip the top two gears around, convert it to a 13 and viola! Poormans 13 double over. You would get your long top legs for cruising, and still have a decent ratio for getting the load miving. Two downsides are, it may be me, but a converted trans doesnt seem to have the split ratio of the real thing. coukd be in my head...my '06 379 has a converted 9 speed behind an Acert Cat, and my splits in that truck are just a smidge over 200rpm, almost worthless. 07 379 cow truck with a 18 speed, behind a modufied isx cummins, has a over 300rpm split which is about perfect, and its a 600rpm jump between whole gears. 2nd downside is youre going to have to plumb air and a compressor, bc contrary to popular belief, when you lose air you are stuck in the high side of the box. Air forces into the low range...NOT fun when youre loaded. [/QUOTE]

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