K so this problem just started about a week ago. I'm driving my jimmy and the rpms in 1st gear go up to about 3.5 and it wont shift unless i let go of the gas and each time it shifts it seems the rpms go higher and the vehicle revs more but has problems shifting and the speedometer moves up and down like crzy when i press the gas but when i let go itll show the speed. ive asked friends for some suggestions and was told to try buying non slip transmission fluid and new vaccuum lines. any else got some more suggestions? please help.