LEDs don't dim based on voltage, which is how incandescent (stock) bulbs dim. LEDs are generally dimmed with a circuit that cycles them off and on very fast to vary the percentage of time that they are on and off. Pulse width modulation is probably the most common way they are dimmed.

That said, LEDs will often get brighter as voltage is increased, but most of the energy beyond what is required to turn them on is converted to heat.

Don't get me wrong, I don't claim to be an expert.

 

Floor wells are 1156. I suggest ones with as little protruding out of the bayonet 'can' as possible. Toss the burnt-toast brown covers that went over the stock lights.

Cluster is size 74. I lot of sites cross reference them with T5, which is a twist LED that sometimes can work. Skip that nonsense and go with 74 that fit into the existing twist sockets. You'll need five for the backlight. If you want to replace warning lights, turn signals, or any other info light, you'll need to get a twist type T5 or T4.7 that is of the same style as stock. Most of the cheapo T5 leds on ebay won't work.

Transfer case and transmission are size 194. I suggest the kind that are flat with two LEDs, one on each side. They light evenly. I desoldered the extra resistors on the ones I sold so they wouldn't output so much heat.

T4.2 for rockers and HVAC, but the HVAC lighting sucks. It's almost not worth messing with unless you wanna pull out the soldering iron and go custom.

The dome center is a 44mm festoon with loops. Most of them will face forward, so the light shines at the windshield instead of down. I'm expecting an order of specially made versions that will point down, since there don't seem to be any, anywhere.

The reading lamps are 194 as well. I suggest any one of these with a chip on board (leds covered in yellow diffusion material) that fits in the enclosure.

Cargo is a 42mm festoon (fuse) type. You can use (knockoff or real) cree types or really anything there, but brightness varies considerably. Again, I like the chip on board type for their even lighting and overall good value.

If you have the OHC, it also uses 42mm festoon type bulbs / LEDs.

The vanity mirrors use 29mm long festoon type LEDs. I forget the proper name off the top of my head.

That's about it I think. LEDs aren't standardized with regards to their sockets, so you'll have to measure if you want to use something different from a 'stock' size.

 

Spot on.....wish this post would have come up a month ago. I did mine based on trial and error and ended up with the combination you listed here. LEDs are a tricky bunch.
And I agree doing the two T4s in the climate controls was a waste of 30 minutes I'll never get back.

 

If you check the link in my sig there is info on how to make the HVAC panel look good, like it should've looked from the factory. I don't sell the parts for it yet, but they are easy to find. I sell interior light sets, but not so much instrument lights right now. Even so, other than giving someone a link to the manufacturers I use, I'm pretty forthcoming with info.