if the fluid is nasty or the gasket is leaking then yes, the bolt holes strip real easy so becareful not to overtorque the 10mm bolts. 91 was the only year to have a dipstick, fill through the hole on left side of pan, fill till full then start motor then fill till full, drive about 5 miles then check while running in neutral, it should just be running out the hole (yes it's a pain in the ass without a lift)