Okay, I have a problem with my capitol gears drive unit, the clutch pack is shot and needs rebuild. Will operate in reverse fine but no forward movement and burnt oil smell and color. 1980 Hatteras 43 double cabin. Detroit 671's, Where can I have these trans rebuilt? Option 2 replace with ZF gears, I have found two units at a good price, Just would like to know if anybody has ever upgraded to these gears on this engine. The ZF's are brand New 2 to 1 drive.