It would be easier to hack up the LTZ harness you have to harvest some wires and pins and then add them to your LT harness. That is what I did then used the DIY instruction I got from pgamboa. Or you could contact @pgamboa for the DIY kit. Good Luck.
I think the confusion here comes from not mentioning it was the differential drop kit. When I read the title and then your thread, I assumed you were talking about a lowering (drop) kit. I hope someone can help you.
Did you ever find anything that works? I am researching the same thing and have found 2 kits that should work. The rough Country 1311 shows as only fitting the trucks but I did an online chat with rough country and was told it would work. The other is the Suspension Maxx GM725m. I think the 1311 should get mine level but the GM725m has some adjustability and metal lower brackets (the RC ones are hard plastic) Any input would be appreciated. https://www.roughcountry.com/gmc-leveling-lift-kit-1311.html?find=2018-gmc-yukon-4wd-381275 https://suspensionmaxx.com/product/SMX-GM725M https://www.youtube.com/watch?v=5NJalqeUH5c
My question about this...Can you set which phone has priority to connect if both phones are present? My old Ram truck could do that...I thought it was handy.
The LTZ harness will be no good for him. He will either need to buy a harness from @pgamboa or buy a kit from him to modify his LT harness. I would start reading at page one in this thread:
I assume, since you have an LT, that you would need the 23154702 switch. You can easily pop off the trim and remove 4 bolts (7mm) to get the switch and have a look. Check out this video: Mirror switch replacement
I just went thru the process with WAMS. I found a cluster on eBay and contacted the seller to see if he'd ship it direct to WAMS and include the order number for reference. Getting it shipped to me was a little harder. From previous experience, WAMS prefers not to ship to Canada. You could always get it shipped to a US address and then get it shipped up or go and get it yourself. Let me know if you have more questions.
I want to send a big shout out to Chris for helping me with the logistics of getting an eBay cluster shipped to him and then up to me in Canada. His communication and understanding was awesome. I love the look of this cluster in my Regular Cab . I'm hoping that someone comes up with a kit to make the HUD look factory. I'd have no issues cutting the dash to get the module in but I'd like to make sure its looks proper when its all finished.
The dl3 harness will not work. The connectors are wired differently. To get the functions the only way is to use a modified dl8 harness and get rid of the dl3 door harnesses.
The functions are missing because you used the dl3 harness. To get the mirrors to function properly, you will need to replace the dl3 harness with a modified dl8 harness (or modify your old dl8 harness). All the details are in your previous post.
The DL3 Harnesses are pinned different than the DL8's. You will need to purchase a modified harness or DIY kit from @pgamboa. I used the set of DL# harnesses I got with my mirrors and harvested the wires/connections I needed.
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