Hello fellas,I am a 3ger. Now dont hold it against me,who came over from super duty land not too long ago. I have a chance to buy a '91 2500 dually utility bed with C. T. D. and 5 speed. It has about 200K on the clock with a new clutch,and has had regular maintenance. It is a clean,clean truck. The asking price is $3,700. 00 any thing i need to look for as far as "secrets" i dont know much about the 12 valvers. Thanks for any help.