o\my 92 is an automatic and i was curious wgat the difference was between drive, overdrive and 1st. also, does it make any difference to switch in and out of them while drivin? thanx

no, switching while driving is stupid

1st gear is something like 4:1
3rd gear is like 1.1:1
4th gear (OD) is .7:1

ok, that made no sence to me

you asked what the difference was between drive, overdrive and 1st

1st holds you in 1st gear which has a 1:1 Ratio
Drive allows you to go between gears 1-3, 3rd gear is 1.1:1
OD allows the transmission to go from 1-4, 4th gear is .7:1