I own a 1998 Chevrolet silverado crew cab dually 3500. One afternoon the transmission didn't shift out of 1st gear so I put in an NP 4500 3 speed overdrive with a granny gear (a real transmission). The 1st part of the split drive shaft had made it longer; had to castrate the 4X4 system; the only thing left is the front axles with the differential. I have plans to make it back to 4X4 ; I already have the conversion kit for the transmission which is the main shaft & the output shaft housing. I'm goin to do the DS4 to DB2 fuel injector pump conversion. If there is any of you proficient diesel techs lead me to a reputable distributing outlet for me to purchase the conversion kit ; I already know I have to change the injector pump fuel lines due to a thread difference. Thank you very much.