u/Aggravating-Main-659

Morning guys,

I have a stock 15 p4x that just hit 80k miles on original suspension. I've decided to stick with OEM ride height suspension but had a couple questions.

1. If I'm looking for no lift, would the 5100 be a benefit at all over 4600? Besides 5100 providing a lift, what differences does it have with the 4600?
2. I'm planning on doing both front and rear shocks myself. What other components would you recommend I purchase during the install? Truck came from Colorado so there is hardly any surface rust but I've read even in low rust prone areas the factory bolts ended up being cut out.
3. Do you think the springs at 80k miles are still fine or should I invest in new ones as well?
4. Should upper and lower control arms be considered for replacing at 80k?

Sorry for the newbie questions. Appreciate any help!