Hi John, Here's what I was able to find out recently about older Borg Warner Velvet Drive gears: There were four models; two inline (Model #s 10-17 & 10-18; available ratios: 1.00, 1.52, 1.91, 2.10, 2.57, 2.91 : 1 ) and two (CR2) drop center (10-13 & 10-14; ratios: 1.58, 2.03, 2.47, 2.93 : 1). The drop center versions are no longer manufactured. Velvet Drive Corp. (spun off from Borg-Warner in the 1990s) continues to build inline models (don't know if they're the same ratios), but the drop centers are obsolete and "orphaned" (my word) in the sense that no one is making parts for them. The BW drop center gears reportedly have a "drop" of about 1.5 inches from the plane where the input shaft goes in the housing to where the output shaft comes out. There is a company in Ft. Lauderdale (Transmission Marine, Inc.) which does repair and rebuild these gears. I visited there recently and learned that they do have rebuilt trannys in stock, which they sell on a sliding scale that depends on the condition of the "core" you're trading in. Briefly, the scale can go as high as $8,000; with the top price for rebuilding a core that is totally shot. They have a limited number of parts manufactured for them (primarily output shafts), but by and large they're using reconditioned used parts to rebuild these gears. Hence the importance of the condition of your core in determining your price. All of the foregoing figures are for complete rebuilds, not lesser repairs. Other alternatives I discussed with them included replacing them altogether with other brand drop center type gears, or new Velvet Drive inline gears. Prices ranged from $3,200 for a Twin Disc "drop type" plus $3,000 installation (because the offset distance is different than that of the BW gear, thus requiring repositioning of the engine and therefore its exhaust lines, control cables, etc.), to $3,200 for a new inline Velvet Drive, again with similar installation costs for repositioning the engine. They recommended putting in an inline if complete replacement is needed. Please note that all of the quotes were informal, NOT written, guaranteed estimates! They also told me that these gears, when mounted behind low power, slow turning engines such as 120HP Lehmans (my case) and properly cared for, will last a VERY long time. They are strongly built and well engineered. TMI's website is www.marinegears.com, and their telephone number is (954) 467-1540. (usual disclaimers) Nils & Nancy Florman M/V Second Act Albin 43 Trunk Surfside, FL