In B.C. I would go with DTT.
Diesel Transmission Technology - DTT Performance Diesel Transmission and Power Accessories
top notch work, and great customer service.
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2003, 3500, 4x4, built auto, PDR Twins, Cool duals, TST,EZ, Smarty, FASS150, BD Rad, Leer cap, Viper5900, HID, 12" Rock Krawler Desert Race lift, SJ indexing ring, DSS, 41" Michelin XZL's on 20" MKW M28's, Thuren HD steering kit, Fox steering stabilizer