First off, the squeaking could be a couple things: It could be the lower strut bushing which you should carefully 'inspect' or have inspected to ensure it's in good shape. Or possibly the upper control arm bushings.
The lower shock/strut bushing pretty much carries all the front end weight ...and it's part of the lower control arm, not the sock. When you replace the shock/strut, you won't be replacing the bushing with new like you would on a normal shock replacement. So over time it's going to wear and should be inspected.
Let's talk about the lower shock/strut bushing. The bushing itself is not really as heavy-duty as one might 'think' a bushing of that utility would be given it's severe duty. However, they designed it as sort of a double-bushing ...bushing in a bushing (if you inspect it carefully). My hunch is that beef's it up, increases the amount of load it can support while keeping the bushing fairly small thereby not having to add more aluminum 'beef' to the lower a-arm (reduce cost). Does that mean your truck's bushing is worn out? NO. But it should be inspected before you start the project. The bushing in my truck's lower control arm was 'sketcky' as I inspected it carefully, but mine has 175k miles. But they're all flat highway miles. It was half-starting to go. It wasn't 'gone-gone' but, I determined it was a good idea to replace it since I was replacing everything else and didn't want to be in there again soon. So I pressed out the old bushing ...and another one in (New ball joint too). TRW ...as they were the OEM suppliers and great quality. The new TRW ball joint has a zerk FWIW. It was a bigger job than the 10 min videos on Y/T show. There wasn't enough room to get my bushing removal cups inside the 'curve' of the lower control arm. But I was able to rig a workable substitute.
A-Arm Bushings: Depending on your truck's mileage, and other factors, ...either way, the
upper A-arm bushings should be looked at carefully. The arms are actually not difficult to remove. The bushings in mine looked 'good' on the truck, until I removed the UCA's where I could put my eye on them. The bushings were in tact, but the rubber had been 'slipping' in the bushing housing. Loose rubber. I replaced them (and all steering/suspension parts).
Loose bushings could definitely cause a 'squeak' ....for sure. So when looking for a squeak, check them also.
AFAIK TRW was the supplier on those UCA's. TRW is part of the ZF conglomerate ...they're a major OEM supplier. But they also sell direct off their website. And for what it's worth, TRW sells lower control arms off their website which appear to be kissing cousins to the originals ...if your truck needs replacements. Reasonably priced. But their shipping is a little slower ...but as long as a guy wasn't in a major hurry he'd be ok.
Have your suspension inspected before buying parts.
