Here what you need for your 18 ram 1500 with an Ra2...
7 speed conversion harness $145 (M² Mods)
Plus from Mopar/salvage yard/Quirk Parts, etc you will need...
18 HVAC module (@ $120) see below
13-18 8.4 bezel ($80-$180)
18 UAx Radio ($700-$1300)
>> 68331631AH (UAQ w/nav) or 68331635AH (UAS)
When using a 18 UAQ or UAS radio (Android Auto/CarPlay) you will need ...
18 HVAC module (vs 13-17) (@ $120)
* 14-18 ram 1500's have a variable displacement compressor (typ. associated with the 7 speed fan)
>> 14-17's = 68268186Ax HVAC module
>> 18's = 68366552AA HVAC module ( get this one)
& Need to match the HVAC module to the 8.4 radio year.
Directions/details & radio PNs can be found in there 2 threads ...
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DIY: 2013+ RA3/RA4 8.4" Radio Conversion Upgrade
How To: Install a 2018 4C (UAQ/UAS) Radio in 2013 - 2017 RAM.
PS: I'm about to take my lunch break and can talk by phone if you want in the next 5mins. Just send me your phone# by private message/conversation
M² Mods.