speedometer question

[badassbowtie81]

ever since ive owned my truck the speedometer hasnt worked and my dad is admiment about me getting it to work. I replaced both of the cables and it worked for maybe 5 min but bounced all around then quit. so i pulled out the nylon gear in the tranny and it is good. im thinking the only other thing is to get another speedometer from the scrapyard and try it out. or maybe bypass the cruise control and run one cable straight to the speedometer. any suggestions?

Thanks,

curt

also it had a 700r4 in it when i bought it and it didnt work, and still didnt work when i put a th350 in it.