[SBTork]

Originally Posted by rideair

As someone that just built a 1988 Suburban DD, I agree with Bluestep on this one. I found that if you replace both the door/window rubber, then use the following products and thought process of sound deadening/temp control, the factory AC will work great. The standard 350 and 700r4 are tried and true, parts found on any street corner, and purchased as a new crate engine and trans rebuild, you will have a 50,000-100,000 mile warranty to boot! You are going to get a certain level on noise out of the doors based on the door panel design (only covers 2/3rd, thus the reason they now use full door covers in new cars)

Start off reading information about sound/temp control here:
https://www.sounddeadenershowdown.com/

I then used the following products in the floor, doors and roof for sound/temp control.

https://www.amazon.com/Noico-deadeni.../dp/B00URUIKAK

https://www.acoustimac.com/soundproo...SABEgJp_vD_BwE

https://www.ebay.com/i/131754566187?...r=431129497605

Not saying I'm right, I'm just lazy and hate reinventing the wheel.

I can attest to the effectiveness of the Noico product. I used their sound deadener and closed cell foam on my '85 Suburban, and noticed a HUGE difference. Last fall I went through and did the entire floor and sides on my Suburban. I'll be doing the roof next spring to fully complete the job, then the doors after that. With just the floor done it made a tremendous difference. The product is top quality and very reasonably priced on Amazon, easy to work with too.