Minor tranny issue

[mccaw69]

Hey all,wondering if anyone else has ever had this issue;I've got a 1993 rolla,auto tranny,if u try drive it b4 the fluids come up to temp,it doesnt want to shift into third.thismay take up to 30 sec to a min,but after it does it shifts fine from then on.Is it a filter problem,stopped up or something.The fluid looks good,and smells good,not burnt.I've about half way decided to change the fluid and filter,any one ever go from standard fluid to synthetic? can you do so with out harming the tranny?

[96coroll]

Oh ya my car does this. I always let it warm up at least two three minutes before i pull out the drive way. So once i'm the on major roads it's all warmed upped and shifts no problem.

i've got a 96 corolla auto with overdrive