Just replaced all for door speakers with JBL 621F coaxial units. Using the metra 82-8148 speaker adaptors and metra 72-8104 wiring adaptors it was a no cut no drill process. 1/2 banana if that once you get the door cards off (which is super easy given all the step by step instructions you can find here and elsewhere). I just disconnected the old tweeters and left them in place and connected and mounted the new coaxes. I'd say it took about 20 minutes a door.
Things to note. My '99 has the base CD/Tape/Radio (no multidisk) the factory speakers were 4 ohm/25 watt not 2 ohm like many find in later 100 series trucks. This makes it much easier to match with common, relatively decent but inexpensive speakers.
Things to note. My '99 has the base CD/Tape/Radio (no multidisk) the factory speakers were 4 ohm/25 watt not 2 ohm like many find in later 100 series trucks. This makes it much easier to match with common, relatively decent but inexpensive speakers.