loud rattling from engine compartment idling in drive. issues shifting into rev on 1996 Ford Explorer

no rattling while driving normal speeds. rattling greatly reduced when i shift into neutral while stopped at traffic light. i have been driving with the rattling for months. just recently started having occasional difficulty shifting into reverse ( auto trans). feels stuck or being forced. brake warning light has also been on for about six mos.

by in Los Angeles, CA on December 10, 2012
2 answers 1 comment
ANSWER by on December 10, 2012
is the rattle in front of the engine or between the engine and transmission?
COMMENT by on December 10, 2012
hard for me to tell. noise only occurs while in drive. no noise when i look under hood in park with engine running. also, my reverse gear problem has vanished once i discovered that my parking brake was engaged...how stupid is that ? i never use it...dont know how it got set. to answer your question, i tend to think the sound is coming more from the underside of the engine maybe slightly to the left.
ANSWER by on May 13, 2013
My 2000 exp. had the same problem. The idle pulley was worn and rattling at low rpms. Stopped when in park or neutral or hiwhay speed.