1999 GMC Safari Questions

1999 GMC Safari Transmission goes out of gear while driving. Changed fluid ,screen and both a and b solenoids still goes out of gear. Doesn't slip just goes out of gear.	1
1999 GMC Safari how do i repair and replace my headlight	1
1999 GMC Safari fuel gauge not functioning?	2
1999 GMC Safari Yesterday my Starter went out, replaced the starter and the van started back up, turned it off and tried to restart now it trys to turn over but does not fire, the fuel pump kicks on but its like its not getting any gas	2
1999 GMC Safari the windshield wipers just stop working.	1
1999 GMC Safari Which o2 sensor should I check with code P0420?	0
1999 GMC Safari Cost to replace broken back door handle	0
1999 GMC Safari where is computer that controls door locks?	0
1999 GMC Safari Do they make handles from a different metal that will not break?	0
1999 GMC Safari Why water is mixing with oil and engine not start after it rolls? service eng.on	0