Ok so ever since i have bought my 1985 Full Size Jimmy with 305/700R4/not sure on transfer case? 208??? anyways the speedometer has never worked so i bought a new gear to go in transfer case and a new cable but neither worked...It worked for maybe three days then went to nothing. Last night i unhooked it from both ends and made sure it wasnt broke or anything and put them back on took it for a test drive and it worked but was very bouncy at first and smoothed out as i drove it more. Then this morning when leaving for school it didnt even bounce or move any. Is it the speedo itself or am i missing something?