How do you add transmission fluid to a manual 1999 Chevy S-10?

A 1999 Chevy S-10 with a manual transmission doesn't have a dipstick to check or add transmission fluid like an automatic. Manual transmissions are generally considered to be sealed for life and don't require regular fluid changes or top-offs. The transmission oil is usually only changed during a major service or if there's a problem (leaks, unusual noises).

If you suspect a problem with your manual transmission (e.g., grinding gears, difficulty shifting, whining noises), you should not attempt to add fluid yourself. Instead, take your truck to a qualified mechanic for diagnosis and repair. Adding fluid to a manual transmission when it doesn't need it can cause serious damage, as overfilling can be just as bad as underfilling.